A wide voltage sensor input circuit

Abstract

This application provides a wide-voltage sensor input circuit, relating to the field of industrial inkjet printers. It includes a power supply, a voltage regulator circuit, a first step-down circuit, a second step-down circuit, an output protection circuit, and an output terminal. The output terminal of the power supply is connected to the input terminals of the voltage regulator circuit and the first step-down circuit. The output terminals of the voltage regulator circuit are connected to the input terminals of the second step-down circuit. The output terminals of the voltage regulator circuit and the first step-down circuit are both connected to the output terminal. The output terminal of the second step-down circuit is connected to the output terminal through the output protection circuit. This invention can increase the input voltage for different sensors, simplifying circuit layout and component matching. It also solves the problem of complex voltage differences in signal transmission between circuits caused by multiple power supplies having different grounds. Furthermore, this design can protect the power supply.

Description

Technical Field

[0001] This application relates to the field of industrial inkjet printers, and more specifically, to a circuit that supports wide-voltage sensor input. Background Technology

[0002] In printer control, there are many types of voltage sensors. Due to the different specifications of the sensors, the required power supply voltage is different. Common types include 5V, 12V, and 24V sensors, which result in different returned signal voltages. A single board is difficult to be compatible with the voltage of multiple sensor specifications. Summary of the Invention

[0003] The purpose of this application is to provide a wide-voltage sensor input circuit that can solve the above-mentioned technical problems.

[0004] This application provides a wide-voltage sensor input circuit, including a power supply, a voltage regulator circuit, a first buck circuit, a second buck circuit, an output protection circuit, and an output terminal. The output terminal of the power supply is connected to the input terminal of the voltage regulator circuit and the input terminal of the first buck circuit. The output terminal of the voltage regulator circuit is connected to the input terminal of the second buck circuit. The output terminals of the voltage regulator circuit and the first buck circuit are both connected to the output terminal. The output terminal of the second buck circuit is connected to the output terminal through the output protection circuit. The voltage output by the output terminal is +12V, +24V, or +5V.

[0005] Preferably, the voltage regulator circuit includes resistors R1 and R2, diodes D1 and D2, capacitors C1, C3, C5, E1, and E2, a voltage regulator U1, and an inductor L1. The input terminal of diode D1 is connected to the power supply, and the output terminal of diode D1 is connected to the second interface of the voltage regulator U1. One end of capacitor C3 and one end of capacitor E1 are both connected to the second interface of the voltage regulator U1, and the other ends of capacitors C3 and E1 are grounded. The fourth and eighth interfaces of the voltage regulator are both grounded, and one end of resistor R2 is connected to the sixth interface of the voltage regulator U1. The other end of resistor R2 is connected to one end of capacitor E2 and one end of inductor L1. The other end of inductor L1 is connected to the first interface of voltage regulator U1. The first interface of voltage regulator U1 is connected to the third interface of voltage regulator U1 through capacitor C1. The sixth interface of voltage regulator U1 is grounded through resistor R1. The first interface of voltage regulator U1 is connected to the output terminal of diode D2. The input terminal of diode D2 is grounded. The other end of capacitor E2 is grounded. One end of capacitor C5 is grounded. The other end of capacitor C5 is connected to one end of inductor L1 and the output terminal.

[0006] Preferably, the voltage regulator U1 is model LM2678.

[0007] Preferably, the first step-down circuit includes capacitors C13, C14, and C11, resistors R3, R6, and R8, a first step-down regulator U2, diode D3, inductor L2, capacitor E3, capacitors C8, C9, C10, C15, and C16, resistors R4, R5, R7, and R13. One end of capacitor C13, one end of capacitor C14, and the second interface of the first step-down regulator U2 are all connected to the power supply. The other ends of capacitors C13 and C14 are grounded. The first interface of the first step-down regulator U2 is connected to the eighth interface of the first step-down regulator U2 through capacitor C11. The third interface of the first step-down regulator U2 is connected to one end of resistor R3 and one end of resistor R8, respectively. The other end of resistor R3 is connected to the second interface of the first step-down regulator U2. The fourth interface of the first step-down regulator U2 is grounded through resistor R6. The other end of resistor R8 is grounded. The eighth interface of the first buck regulator U2 is connected to the output terminal through the inductor L2. The output terminal of diode D3, one end of capacitor C8, one end of capacitor C9, and one end of capacitor C10 are all connected to the seventh interface of the first buck regulator U2. The output terminal of diode D3 is connected to one end of inductor L2. The other ends of capacitor C8, C9, and C10 are all connected to the other end of inductor L2. One end of capacitor E3 is connected to the other end of inductor L2, and the other end of capacitor E3 is grounded. The sixth interface of the first buck regulator U2 is grounded through capacitor C15. The sixth interface of the first buck regulator U2 is grounded through capacitor C16 and resistor R4. The other end of inductor L2 is grounded through resistors R5, R7, and R13. The fifth interface of the first buck regulator U2 is grounded through resistor R13.

[0008] Preferably, the first step-down regulator U2 is model TPS54360.

[0009] Preferably, the second step-down circuit includes capacitors C21, C22, and C20; resistors R34, R39, and R35; a second step-down regulator U2; diode D8; inductor L3; capacitor E4; capacitors C17, C18, C19, C23, and C24; and resistors R35, R36, R40, and R46. One end of capacitor C21, one end of capacitor C22, and the second interface of the second step-down regulator U2 are all connected to the power supply. The other ends of capacitor C21 and capacitor C22 are both grounded. The first interface of the second buck regulator U2 is connected to the eighth interface of the second buck regulator U2 through capacitor C20. The third interface of the second buck regulator U2 is connected to one end of resistor R34 and one end of resistor R352. The other end of resistor R34 is connected to the second interface of the second buck regulator U2. The fourth interface of the second buck regulator U2 is grounded through resistor R39. The other end of resistor R352 is grounded. The eighth interface of the second buck regulator U2 is connected to the output terminal through inductor L3. The output terminal of diode D8, one end of capacitor C17, one end of capacitor C18, and one end of capacitor C19 are all connected to the seventh interface of the second buck regulator U2. The output terminal of diode D8 is connected to one end of inductor L3. The other ends of capacitors C17, C18, and C19 are all connected to the other end of inductor L3. One end of capacitor E4 is connected to the other end of inductor L3, and the other end of capacitor E4 is grounded. The sixth interface of the second buck regulator U2 is grounded through capacitor C23. The sixth interface of the second buck regulator U2 is grounded through capacitor C24 and resistor R35. The other end of inductor L3 is grounded through resistors R36, R40, and R46. The fifth interface of the second buck regulator U2 is grounded through resistor R46.

[0010] Preferably, the second step-down regulator U2 is model TPS54360.

[0011] Preferably, the output protection circuit includes diode D7, resistors R25, R27, R29, R31, R33, transistor Q4, and light-emitting diode LED4.

[0012] The beneficial effects of this utility model are:

[0013] This utility model provides a wide-voltage sensor input circuit, including a power supply, a voltage regulator circuit, a first step-down circuit, a second step-down circuit, an output protection circuit, and an output terminal. The output terminal of the power supply is connected to the input terminals of the voltage regulator circuit and the first step-down circuit. The output terminal of the voltage regulator circuit is connected to the input terminal of the second step-down circuit. The output terminals of the voltage regulator circuit and the first step-down circuit are both connected to the output terminal. The output terminal of the second step-down circuit is connected to the output terminal through the output protection circuit. The output voltage of the output terminal is +12V, +24V, and +5V. This utility model can increase the +12V, +24V, and +5V voltages through the voltage regulator circuit, the first step-down circuit, and the second step-down circuit, which can increase the input voltage for different sensors. It not only simplifies the circuit layout and component matching, but also solves the problem of complex voltage difference in signal transmission between circuits caused by multiple power supplies having different grounds. Furthermore, this design can also protect the power supply. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a diagram of the voltage regulator circuit of this utility model;

[0016] Figure 2 This is the first step-down circuit diagram of this utility model;

[0017] Figure 3 This is the second step-down circuit diagram of this utility model;

[0018] Figure 4 This is a circuit diagram of the output protection circuit and output terminal of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] like Figure 1-4As shown, a wide-voltage sensor input circuit includes a power supply, a voltage regulator circuit, a first step-down circuit, a second step-down circuit, an output protection circuit, and an output terminal. The output terminal of the power supply is connected to the input terminals of the voltage regulator circuit and the first step-down circuit. The output terminals of the voltage regulator circuit are connected to the input terminals of the second step-down circuit. The output terminals of the voltage regulator circuit and the first step-down circuit are both connected to the output terminal. The output terminal of the second step-down circuit is connected to the output terminal through the output protection circuit. The output voltages of the output terminal are +12V, +24V, and +5V. This invention can increase the +12V, +24V, and +5V voltages through the voltage regulator circuit, the first step-down circuit, and the second step-down circuit, thereby increasing the input voltage for different sensors. It not only simplifies the circuit layout and component matching but also solves the problem of complex voltage differences in signal transmission between circuits caused by multiple power supplies having different grounds. Furthermore, this design can also protect the power supply.

[0026] like Figure 1 As shown, in this embodiment, the voltage regulator circuit includes resistors R1 and R2, diodes D1 and D2, capacitors C1, C3, C5, E1, and E2, a voltage regulator U1, and an inductor L1. The input terminal of diode D1 is connected to the power supply, and the output terminal of diode D1 is connected to the second interface of the voltage regulator U1. One end of capacitor C3 and one end of capacitor E1 are both connected to the second interface of the voltage regulator U1, and the other ends of capacitors C3 and E1 are both grounded. The fourth and eighth interfaces of the voltage regulator are both grounded. One end of resistor R2 is connected to the sixth interface of the voltage regulator U1. The resistor R2 is connected to one end of the capacitor E2 and one end of the inductor L1. The other end of the inductor L1 is connected to the first interface of the voltage regulator U1. The first interface of the voltage regulator U1 is connected to the third interface of the voltage regulator U1 through the capacitor C1. The sixth interface of the voltage regulator U1 is grounded through the resistor R1. The first interface of the voltage regulator U1 is connected to the output terminal of the diode D2. The input terminal of the diode D2 is grounded. The other end of the capacitor E2 is grounded. One end of the capacitor C5 is grounded. The other end of the capacitor C5 is connected to one end of the inductor L1 and the output terminal.

[0027] like Figure 1 As shown, in this embodiment, the voltage regulator U1 is model LM2678.

[0028] like Figure 2As shown, in this embodiment, the first step-down circuit includes capacitors C13, C14, and C11, resistors R3, R6, and R8, a first step-down regulator U2, diode D3, inductor L2, capacitor E3, capacitors C8, C9, C10, C15, and C16, resistors R4, R5, R7, and R13. One end of capacitor C13, one end of capacitor C14, and the second interface of the first step-down regulator U2 are all connected to the power supply. The other ends of capacitors C13 and C14 are grounded. The first interface of the first step-down regulator U2 is connected to the eighth interface of the first step-down regulator U2 through capacitor C11. The third interface of the first step-down regulator U2 is connected to one end of resistor R3 and one end of resistor R8, respectively. The other end of resistor R3 is connected to the second interface of the first step-down regulator U2. The fourth interface of the first step-down regulator U2 is grounded through resistor R6. The other end of resistor R8 is grounded. The eighth interface of the first buck regulator U2 is connected to the output terminal through inductor L2. The output terminal of diode D3, one end of capacitor C8, one end of capacitor C9, and one end of capacitor C10 are all connected to the seventh interface of the first buck regulator U2. The output terminal of diode D3 is connected to one end of inductor L2. The other ends of capacitor C8, C9, and C10 are all connected to the other end of inductor L2. One end of capacitor E3 is connected to the other end of inductor L2, and the other end of capacitor E3 is grounded. The sixth interface of the first buck regulator U2 is grounded through capacitor C15. The sixth interface of the first buck regulator U2 is grounded through capacitor C16 and resistor R4. The other end of inductor L2 is grounded through resistors R5, R7, and R13. The fifth interface of the first buck regulator U2 is grounded through resistor R13.

[0029] like Figure 2 As shown, in this embodiment, the first step-down regulator U2 is a TPS54360.

[0030] like Figure 3As shown, in this embodiment, the second step-down circuit includes capacitors C21, C22, and C20, resistors R34, R39, and R352, a second step-down regulator U2, diode D8, inductor L3, capacitor E4, capacitors C17, C18, C19, C23, and C24, resistors R35, R36, R40, and R46. One end of capacitor C21, one end of capacitor C22, and the second interface of the second step-down regulator U2 are all connected to the... In the power connection, the other ends of capacitor C21 and capacitor C22 are both grounded. The first interface of the second buck regulator U2 is connected to the eighth interface of the second buck regulator U2 through capacitor C20. The third interface of the second buck regulator U2 is connected to one end of resistor R34 and one end of resistor R352. The other end of resistor R34 is connected to the second interface of the second buck regulator U2. The fourth interface of the second buck regulator U2 is connected to... The other end of resistor R352 is grounded. The eighth interface of the second buck regulator U2 is connected to the output terminal through inductor L3. The output terminal of diode D8, one end of capacitor C17, one end of capacitor C18, and one end of capacitor C19 are all connected to the seventh interface of the second buck regulator U2. The output terminal of diode D8 is connected to one end of inductor L3. The other ends of capacitors C17, C18, and C19 are all connected to the other end of inductor L3. One end of capacitor E4 is connected to the other end of inductor L3, and the other end of capacitor E4 is grounded. The sixth interface of the second buck regulator U2 is grounded through capacitor C23. The sixth interface of the second buck regulator U2 is grounded through capacitor C24 and resistor R35. The other end of inductor L3 is grounded through resistors R36, R40, and R46. The fifth interface of the second buck regulator U2 is grounded through resistor R46.

[0031] like Figure 3 As shown, in this embodiment, the second step-down regulator U2 is a TPS54360.

[0032] This design utilizes the DC-DC power supply chip, specifically the LM2678. The LM2678 series regulators are monolithic regulators that provide all the functions of an active buck switching regulator, capable of driving loads up to 5A, and exhibiting excellent line and load regulation characteristics. High efficiency (>90%) is achieved through the use of a low on-resistance DMOS power switch; the LM2678 chip steps down a 36V output to 12V. The TPS54306 chip has an input voltage range of 4.5V to 60V, with an absolute maximum of 65V. This chip is a 60V, 3.5A buck regulator with an integrated high-side MOSFET, capable of withstanding load dump pulses up to 65V, and its current-mode control provides simple external compensation and flexible component selection. The TPS54306 chip can be used to step down a 36V output to 24V, and it can also step down a 24V output to 5V. When the required voltage (such as 24V or 5V) is output through the TPS54360 chip, the output voltage divider resistor component of this circuit can be adjusted. This invention not only achieves compatibility with multiple power supplies but also simplifies the selection of circuit components.

[0033] like Figure 4 As shown, in this embodiment, the output protection circuit includes diode D7, resistors R25, R27, R29, R31, R33, transistor Q4, and light-emitting diode LED4.

[0034] After the power supply enters the input terminal, it can be split into two paths. When the input point is not pulled down and short-circuited, diode D7 and transistor Q4 conduct normally. The conduction of transistor Q4 is equivalent to a closed switch, which can directly short-circuit the path of LED4, and at this time, LED4 is off. When the input point is pulled down and short-circuited, transistor Q4 is equivalent to an open switch, and the power supply can flow directly through the path of LED4, and at this time, LED is on. This design uses the working principle of reverse control of LED.

[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A circuit supporting wide voltage sensor input, characterized in that: The device includes a power supply, a voltage regulator circuit, a first step-down circuit, a second step-down circuit, an output protection circuit, and an output terminal. The output terminal of the power supply is connected to the input terminal of the voltage regulator circuit and the input terminal of the first step-down circuit. The output terminal of the voltage regulator circuit is connected to the input terminal of the second step-down circuit. The output terminals of the voltage regulator circuit and the first step-down circuit are both connected to the output terminal. The output terminal is connected to the output terminal through the output protection circuit. The output voltages of the output terminal are +12V, +24V, and +5V.

2. The wide voltage sensor input circuit according to claim 1, characterized in that: The voltage regulator circuit includes resistors R1 and R2, diodes D1 and D2, capacitors C1, C3, C5, E1, and E2, a voltage regulator U1, and an inductor L1. The input terminal of diode D1 is connected to the power supply, and the output terminal of diode D1 is connected to the second interface of the voltage regulator U1. One end of capacitor C3 and one end of capacitor E1 are both connected to the second interface of the voltage regulator U1, and the other ends of capacitors C3 and E1 are grounded. The fourth and eighth interfaces of the voltage regulator are both grounded. One end of resistor R2 is connected to the sixth interface of the voltage regulator U1. The other end of resistor R2 is connected to one end of capacitor E2 and one end of inductor L1. The other end of inductor L1 is connected to the first interface of voltage regulator U1. The first interface of voltage regulator U1 is connected to the third interface of voltage regulator U1 through capacitor C1. The sixth interface of voltage regulator U1 is grounded through resistor R1. The first interface of voltage regulator U1 is connected to the output terminal of diode D2. The input terminal of diode D2 is grounded. The other end of capacitor E2 is grounded. One end of capacitor C5 is grounded. The other end of capacitor C5 is connected to one end of inductor L1 and the output terminal.

3. The wide voltage sensor input circuit according to claim 2, characterized in that: The voltage regulator U1 is model LM2678.

4. A wide-voltage sensor input circuit according to claim 1, characterized in that: The first step-down circuit includes capacitors C13, C14, and C11, resistors R3, R6, and R8, a first step-down regulator U2, diode D3, inductor L2, capacitor E3, capacitors C8, C9, C10, C15, and C16, and resistors R4, R5, R7, and R13. One end of capacitor C13, one end of capacitor C14, and the second interface of the first step-down regulator U2 are all connected to the power supply. The other ends of capacitors C13 and C14 are grounded. The first interface of the first step-down regulator U2 is connected to the eighth interface of the first step-down regulator U2 through capacitor C11. The third interface of the first step-down regulator U2 is connected to one end of resistor R3 and one end of resistor R8. The other end of resistor R3 is connected to the second interface of the first step-down regulator U2. The fourth interface of the first step-down regulator U2 is grounded through resistor R6. The other end of 8 is grounded. The eighth interface of the first buck regulator U2 is connected to the output terminal through the inductor L2. The output terminal of the diode D3, one end of the capacitor C8, one end of the capacitor C9, and one end of the capacitor C10 are all connected to the seventh interface of the first buck regulator U2. The output terminal of the diode D3 is connected to one end of the inductor L2. The other ends of the capacitors C8, C9, and C10 are all connected to the other end of the inductor L2. One end of the capacitor E3 is connected to the other end of the inductor L2, and the other end of the capacitor E3 is grounded. The sixth interface of the first buck regulator U2 is grounded through the capacitor C15. The sixth interface of the first buck regulator U2 is grounded through the capacitor C16 and the resistor R4. The other end of the inductor L2 is grounded through the resistors R5, R7, and R13. The fifth interface of the first buck regulator U2 is grounded through the resistor R13.

5. A wide-voltage sensor input circuit according to claim 4, characterized in that: The first step-down regulator U2 is model TPS54360.

6. A wide-voltage sensor input circuit according to claim 1, characterized in that: The second step-down circuit includes capacitors C21, C22, and C20; resistors R34, R39, and R35; a second step-down regulator U2; diode D8; inductor L3; capacitor E4; capacitors C17, C18, C19, C23, and C24; and resistors R35, R36, R40, and R46. One end of capacitor C21, one end of capacitor C22, and the second interface of the second step-down regulator U2 are all connected to the power supply. The other ends of capacitor C21 and capacitor C22 are both grounded. The first interface of the second buck regulator U2 is connected to the eighth interface of the second buck regulator U2 through capacitor C20. The third interface of the second buck regulator U2 is connected to one end of resistor R34 and one end of resistor R352. The other end of resistor R34 is connected to the second interface of the second buck regulator U2. The fourth interface of the second buck regulator U2 is grounded through resistor R39. The other end of resistor R352 is grounded. The eighth interface of the second buck regulator U2 is connected to the output terminal through the inductor L3. The output terminal of diode D8, one end of capacitor C17, one end of capacitor C18, and one end of capacitor C19 are all connected to the seventh interface of the second buck regulator U2. The output terminal of diode D8 is connected to one end of inductor L3. The other ends of capacitors C17, C18, and C19 are all connected to the other end of inductor L3. One end of capacitor E4 is connected to the other end of inductor L3, and the other end of capacitor E4 is grounded. The sixth interface of the second buck regulator U2 is grounded through capacitor C23. The sixth interface of the second buck regulator U2 is grounded through capacitor C24 and resistor R35. The other end of inductor L3 is grounded through resistors R36, R40, and R46. The fifth interface of the second buck regulator U2 is grounded through resistor R46.

7. A wide-voltage sensor input circuit according to claim 6, characterized in that: The second step-down regulator U2 is model TPS54360.

8. A wide-voltage sensor input circuit according to claim 1, characterized in that: The output protection circuit includes diode D7, resistors R25, R27, R29, R31, R33, transistor Q4, and light-emitting diode LED4.

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