Double-voltage selection input circuit, module thereof and jet printing system

Abstract

The utility model discloses a double-voltage selection input circuit, a module thereof and a jet printing system, and the circuit comprises a first input circuit which is used for outputting an accessed pulse signal; the second input circuit is used for outputting the accessed pulse signal; the first output circuit is used for being connected with code spraying equipment; the second output circuit is used for being connected with the controller; the first input end of the multiplexing circuit is connected with the first input circuit, the second input end of the multiplexing circuit is connected with the second input circuit, the first output end of the multiplexing circuit is connected with the first output circuit, and the second output end of the multiplexing circuit is connected with the second output circuit. Controlling the first input circuit to output a first pulse signal to the code spraying equipment, and controlling the second output circuit to output a second pulse signal to the controller; the voltage value of the first pulse signal is smaller than that of the second pulse signal. According to the technical scheme of the utility model, the single encoder can provide pulse signals for the jet printing equipment and the controller at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of inkjet printing equipment, and particularly relates to a dual-voltage selection input circuit, its module and an inkjet printing system. Background Art

[0002] At present, both inkjet printing equipment and controllers need to use encoders to provide pulse signals for calculating speed and length. However, since the signal input voltages used by the inkjet coding equipment and the controller are different, it is necessary to separately equip encoders for the inkjet coding equipment and the controller. However, there is not enough space in the actual system to install multiple encoders. If the inkjet printing equipment and the controller share an encoder to provide pulse signals, the inconsistent use voltages of both parties will affect the signal input of both parties. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a dual-voltage selection input circuit, aiming to solve the problem that a single encoder cannot simultaneously provide pulse signals for inkjet printing equipment and a controller.

[0004] To achieve the above purpose, the dual-voltage selection input circuit proposed by the utility model includes:

[0005] A first input circuit for outputting the input pulse signal;

[0006] A first output circuit for connecting to the inkjet coding equipment;

[0007] A second output circuit for connecting to the controller;

[0008] A multiplexing circuit, with a first input end connected to the first input circuit, a first output end connected to the first output circuit, and a second output end connected to the second output circuit;

[0009] The multiplexing circuit is used to control the first input circuit to output a first pulse signal to the inkjet coding equipment and control the second output circuit to output a second pulse signal to the controller according to the pulse signal output by the first input circuit;

[0010] Wherein, the voltage value of the first pulse signal is less than the voltage value of the second pulse signal.

[0011] Optionally, the dual-voltage selection input circuit further includes:

[0012] A second input circuit connected to the second input end of the multiplexing circuit for outputting the input pulse signal to the multiplexing circuit;

[0013] A control signal input circuit is connected to the controlled end of the multiplexing circuit, and the control signal input circuit outputs the received control signal to the multiplexing circuit;

[0014] The multiplexing circuit is further configured to, when receiving the switching signal, control the first input circuit to output a first pulse signal to the inkjet device according to the pulse signal output by the second input circuit.

[0015] Optionally, the first input circuit includes: a first resistor, a second resistor, a third resistor, a first capacitor, a first diode, a first optocoupler, and a first light-emitting diode;

[0016] The third ends of the first resistor and the primary side of the first optocoupler are respectively connected to corresponding pulse signals. The second end of the first resistor is connected to the first end of the primary side of the first optocoupler. The first end and the second end of the second resistor are connected to the first end and the third end of the primary side of the first optocoupler one by one. The cathode and the anode of the first diode are connected to the first end and the third end of the primary side of the first optocoupler one by one. The first end of the secondary side of the first optocoupler is connected to a first preset power supply voltage. The second end of the secondary side of the first optocoupler is the output end of the first input circuit. The second end of the secondary side of the first optocoupler is connected to the first end of the third resistor. The third end of the secondary side of the first optocoupler is grounded. The first capacitor is connected between the first end and the third end of the secondary side of the first optocoupler. The second end of the third resistor is connected to the anode of the first light-emitting diode, and the output end of the first light-emitting diode is grounded.

[0017] Optionally, the dual-voltage selection circuit further includes: a switch and a fourth resistor;

[0018] The first end of the switch is connected to the first end of the first resistor, and the second end of the switch is connected to the first end of the primary side of the first optocoupler via the fourth resistor.

[0019] Optionally, the circuit structures of the first input circuit, the control signal input circuit, and the second input circuit are the same.

[0020] Optionally, the first output circuit is configured to output 4 first pulse signals, and the number of the first input circuits and the second output circuits is two.

[0021] Optionally, the second output circuit includes a fifth resistor, a sixth resistor, a second capacitor, a second optocoupler, and a second light-emitting diode;

[0022] The first end of the primary side of the second optocoupler is connected to the multiplexing circuit through the fifth resistor, and the third end of the primary side of the second optocoupler is grounded; the first end of the secondary side of the second optocoupler is connected to a second preset power supply voltage; the second end of the secondary side of the second optocoupler is the output end of the second output circuit and is connected to the first end of the sixth resistor; the second end of the sixth resistor is connected to the anode of the second light-emitting diode, and the cathode of the second light-emitting diode is connected to the third end of the secondary side of the second optocoupler; the second capacitor is connected between the first end and the third end of the secondary side of the second optocoupler;

[0023] Wherein, the second preset voltage value is equal to the voltage value of the second pulse signal.

[0024] Optionally, the voltage value of the first pulse signal is 5V, and the voltage value of the second pulse signal is 24V.

[0025] The present invention also provides a dual-voltage selection input module, including the dual-voltage selection input circuit as described above.

[0026] The present invention also provides an inkjet printing system, including a controller, an inkjet coding device, and the dual-voltage selection input circuit as described above;

[0027] The dual-voltage selection input circuit is respectively connected to the controller and the inkjet coding device.

[0028] The technical solution of the present invention adopts a first input circuit, a first output circuit, a second output circuit, and a multiplexing circuit, and enables the multiplexing circuit to control the first input circuit to output a first pulse signal to the inkjet coding device and control the second output circuit to output a second pulse signal to the controller according to the pulse signal output by the first input circuit, so as to be able to use one encoder to simultaneously provide pulse signals for the operation of the inkjet coding device and the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a schematic diagram of a module of an embodiment of the dual-voltage selection input circuit of the present invention;

[0031] Figure 2 It is a schematic diagram of a module of another embodiment of the dual-voltage selection input circuit of the present invention;

[0032] Figure 3 Schematic diagram of the first input circuit in an embodiment of the dual-voltage selection input circuit of the present utility model;

[0033] Figure 4 Schematic diagram of the switch and the fourth resistor in another embodiment of the dual-voltage selection input circuit of the present utility model;

[0034] Figure 5 Schematic diagram of the second output circuit in an embodiment of the dual-voltage selection input circuit of the present utility model;

[0035] Figure 6 Schematic diagram of the first output circuit and the multiplexing circuit in an embodiment of the dual-voltage selection input circuit of the present utility model;

[0036] Figure 7 is Figure 6 Logical schematic diagram of each port of the multiplexer in the multiplexing circuit in;

[0037] Figure 8 is Figure 6 Logical schematic diagram of each port of the bus transceiver in the first output circuit in.

[0038] Explanation of the reference numerals in the drawings:

[0039]

[0040] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0042] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0043] The present utility model provides a dual - voltage selection input circuit.

[0044] Referring to Figure 1 , in one embodiment, the dual - voltage selection input circuit includes:

[0045] A first input circuit 10 for outputting an input pulse signal;

[0046] A first output circuit 30 for connecting to a coding device;

[0047] A second output circuit 40 for connecting to a controller;

[0048] A multiplexing circuit 50, with a first input terminal connected to the first input circuit 10, a first output terminal connected to the first output circuit 30, and a second output terminal connected to the second output circuit 40;

[0049] When the multiplexing circuit 50 does not receive the switching signal, it controls the first input circuit 10 to output a first pulse signal to the coding device according to the pulse signal output by the first input circuit 10, and controls the second output circuit 40 to output a second pulse signal to the controller;

[0050] Wherein, the voltage value of the first pulse signal is less than the voltage value of the second pulse signal.

[0051] In this embodiment, the first input circuit 10 can be connected to an encoder to access the pulse signal output by the encoder, and this encoder can be a common encoder for the controller and the printing device. The first input circuit 10 can isolate the input pulse signal and then output it to the multiplexing circuit 50. The multiplexing circuit 50 can access the pulse signal output by the first output circuit 30, and can convert this pulse signal into a first control signal and a second control signal respectively, where the first control signal can be output to the first output circuit 30 to drive the first output circuit 30 to output a first pulse signal to the coding device, while the second control signal can be output to the second output circuit 40 to drive the second output circuit 40 to output a second pulse signal to the controller.

[0052] The voltage values of the first pulse signal and the second pulse signal can be determined by the voltage values of the pulse signals required by the coding device and the controller respectively. In an alternative embodiment, the voltage value of the first pulse signal is 5V, while the voltage value of the second pulse signal is 24V.

[0053] Thus, the technical solution of this application can convert the pulse signal output by one encoder into a first pulse signal and a second pulse signal, and output the first pulse signal and the second pulse signal to the inkjet printing device and the controller respectively, so as to be able to use one encoder to provide pulse signals for the operation of the inkjet printing device and the controller simultaneously.

[0054] In actual use, when the encoder has no pulse output, that is, in the first input circuit 10, the ink receiving function of the inkjet printing device cannot complete the entire ink receiving process. In response to this, referring to Figure 2 , the dual-voltage selection input circuit further includes:

[0055] A second input circuit 20, connected to the second input end of the multiplexing circuit 50, for outputting the received pulse signal to the multiplexing circuit 50;

[0056] A control signal input circuit 60, connected to the controlled end of the multiplexing circuit 50, and the control signal input circuit 60 outputs the received control signal to the multiplexing circuit 50;

[0057] The multiplexing circuit 50 is further configured to, when receiving the switching signal, control the first input circuit 10 to output a first pulse signal to the inkjet printing device according to the pulse signal output by the second input circuit 20.

[0058] In this embodiment, the control signal input circuit 60 can be implemented by building discrete devices such as resistors, capacitors, and diodes; the switching signal can be obtained by the output of the controller. Therefore, when the controller does not output a switching signal, the multiplexing circuit 50 can control the first output circuit 30 and the second output circuit 40 to output corresponding pulse signals according to the pulse signal output by the first input circuit 10; when the encoder has no pulse output, a pulse signal can be provided to the second input circuit 20 so that the second input circuit 20 can isolate the received pulse signal and output it to the multiplexing circuit 50, and then the controller outputs a switching signal to the multiplexing circuit 50. The multiplexing circuit 50 can, after receiving the switching signal, switch to generating a first control signal according to the pulse signal output by the second input circuit 20, so that the first output circuit 30 can maintain the output of the first pulse signal to the inkjet printing device, thereby ensuring that the ink receiving function of the inkjet printing device can be successfully realized.

[0059] Referring to Figure 3 , the first input circuit 10 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first diode D1, a first optocoupler U1, and a first light-emitting diode D11;

[0060] The first resistor R1 and the third terminal of the primary side of the first optocoupler U1 are respectively connected to corresponding pulse signals. The second terminal of the first resistor R1 is connected to the first terminal of the primary side of the first optocoupler U1. The first terminal and the second terminal of the second resistor R2 are connected to the first terminal and the third terminal of the primary side of the first optocoupler U1 in a one-to-one manner. The cathode and the anode of the first diode D1 are connected to the first terminal and the third terminal of the primary side of the first optocoupler U1 in a one-to-one manner. The first terminal of the secondary side of the first optocoupler U1 is connected to a first preset supply voltage. The second terminal of the secondary side of the first optocoupler U1 is the output terminal of the first input circuit 10. The second terminal of the secondary side of the first optocoupler U1 is connected to the first terminal of the third resistor R3. The third terminal of the secondary side of the first optocoupler U1 is grounded. The first capacitor C1 is connected between the first terminal and the third terminal of the secondary side of the first optocoupler U1. The second terminal of the third resistor R3 is connected to the anode of the first light-emitting diode D11, and the output terminal of the first light-emitting diode D11 is grounded.

[0061] In this embodiment, the primary side and the secondary side of the first optocoupler U1 can both have a first terminal, a second terminal, and a third terminal. Among them, the second terminal of the primary side can be left vacant. The first optocoupler U1 can be turned on under the drive of the pulse signals connected to the first terminal and the third terminal of the primary side, and when it is turned on, it can convert the connected first preset supply voltage into a corresponding output voltage and output it to the multiplexing circuit 50. And when there is a pulse signal output, a voltage difference will be generated across the first light-emitting diode D11, thereby generating a drive current flowing through the first light-emitting diode D11, and then triggering the first light-emitting diode D11 to emit light to indicate that the first input circuit 10 is working properly.

[0062] Since the voltage value of the pulse signal connected to the first input circuit 10 depends on the supply voltage of the encoder, and when the encoder has two supply voltage levels, the pulse signals it outputs also have two voltage values. For pulse signals with different voltage values, the requirements for the input impedance are also different.

[0063] In response to this, referring to Figure 4 , the dual-voltage selection circuit further includes: a switch SW and a fourth resistor R4. The first terminal of the switch SW is connected to the first terminal of the first resistor R1, and the second terminal of the switch SW is connected to the first terminal of the primary side of the first optocoupler U1 through the fourth resistor R4.

[0064] Among them, the switch SW can be a DIP switch. In this way, by controlling the on / off state of the switch SW, the fourth resistor R4 can be connected in parallel with the first resistor R1, or the parallel connection of the fourth resistor R4 and the first resistor R1 can be disconnected, so as to achieve the purpose of changing the input impedance of the first input circuit 10, so that the input impedance of the first input circuit 10 can also have two impedance levels, and then to adapt to different voltage value pulse signals connected.

[0065] Optionally, the circuit structures of the first input circuit 10, the control signal input circuit 60, and the second input circuit 20 are the same.

[0066] Among them, the circuit structure of the first input circuit 10 can be referred to Figure 3 or Figure 4 As shown, the circuit structures of the control signal input circuit 60 and the second input circuit 20 are the same as that of the first input circuit 10, which will not be elaborated in this embodiment. It should be noted that the same circuit structure in this embodiment only means that the connection relationships of the electronic devices therein are the same, but it does not mean that the parameters of the electronic devices at the corresponding positions in the circuit (such as resistance values) are also exactly the same. With such a setting, by adopting the same circuit structure to implement the first input circuit 10, the control signal input circuit 60, and the second input circuit 20, the circuit design difficulty can be effectively reduced.

[0067] Optionally, the first output circuit 30 is used to output 4 first pulse signals, and the number of the first input circuit 10 and the second output circuit 40 is two.

[0068] In this embodiment, referring to Figure 6 , the multiplexing circuit 50 can be implemented by using a multiplexer U3 of model SN74HC157DR, and the first output circuit 30 can be implemented by using a bus transceiver U4 of model 74HC245PW.

[0069] The multiplexer U3 of SN74HC157DR has terminal, terminal, 1A terminal, 1B terminal, 1Y terminal, 2A terminal, 2B terminal, 2Y terminal, 3A terminal, 3B terminal, 3Y terminal, 4A terminal, 4B terminal, 4Y terminal, VCC terminal, GND terminal. Among them the terminal is used to connect to the control signal input circuit 60; the 1A terminal and 2A terminal are connected to the two first input circuits 10 one-to-one; the 1B terminal and 1C terminal are connected to the two second input circuits 20 one-to-one; the 4Y terminal and 3Y terminal are connected to the two second output circuits 40 one-to-one. The connection relationships of the other ports of the multiplexer U3 can be referred to Figure 6 , which will not be elaborated here, and the trigger logic of each port of the multiplexer U3 can be referred to Figure 7 as shown.

[0070] The bus transceiver U4 of 74HC245PW has a D1R terminal, Terminal, A0 terminal, A1 terminal, A2 terminal, A3 terminal, A4 terminal, A5 terminal, A6 terminal, A7 terminal, B1 terminal, B2 terminal, B3 terminal, B4 terminal, B5 terminal, B6 terminal, B7 terminal, VCC terminal, GND terminal. Among them, after A0 terminal, A1 terminal, A2 terminal, and A3 terminal are interconnected, they are connected to the 1Y terminal of multiplexer U3; after A4 terminal, A5 terminal, A6 terminal, and A7 terminal are interconnected, they are connected to the 2Y terminal of multiplexer U3; A total of 4 first pulse signals with a voltage value of 5V are output from B0 terminal to B7 terminal. The connection relationship of other ports of bus transceiver U4 can be referred to Figure 6 , which will not be elaborated here, and the trigger logic diagram of each port of bus transceiver U4 can be referred to Figure 8 as shown.

[0071] Optionally, referring to Figure 5 , the second output circuit 40 includes a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a second optocoupler U2, and a second light-emitting diode D12;

[0072] The first end of the primary side of the second optocoupler U2 is connected to the multiplexing circuit 50 through the fifth resistor R5, and the third end of the primary side of the second optocoupler U2 is grounded; the first end of the secondary side of the second optocoupler U2 is connected to a second preset supply voltage; the second end of the secondary side of the second optocoupler U2 is the output end of the second output circuit 40 and is connected to the first end of the sixth resistor R6; the second end of the sixth resistor R6 is connected to the anode of the second light-emitting diode D12, and the cathode of the second light-emitting diode D12 is connected to the third end of the secondary side of the second optocoupler U2; the second capacitor C2 is connected between the first end and the third end of the secondary side of the second optocoupler U2;

[0073] Among them, the second preset voltage value is equal to the voltage value of the second pulse signal.

[0074] In this embodiment, both the primary side and the secondary side of the second optocoupler U2 can have a first end, a second end, and a third end; the second end of the primary side can be left vacant. The second optocoupler U2 can be turned on under the drive of a second control signal applied to the first end of the primary side, and when turned on, it can convert the applied second preset supply voltage into a corresponding second pulse signal. And when there is a second pulse signal output, a voltage difference will be generated across the second light-emitting diode D12, thereby generating a driving current flowing through the second light-emitting diode D12, and then triggering the second light-emitting diode D12 to emit light to indicate that the second output circuit 40 is working properly.

[0075] Among them, the second preset supply voltage can be 24V. In this way, when the number of the second output circuits 40 is two, two second pulse signals with a voltage value of 24V can be output.

[0076] The present utility model further provides a dual-voltage selection input module, which includes a dual-voltage selection input circuit. The specific structure of the dual-voltage selection input circuit refers to the above-mentioned embodiments. Since this dual-voltage selection input module adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Among them, the dual-voltage selection input module may further include a circuit board, and the dual-voltage selection input circuit is arranged on the circuit board.

[0077] The present utility model further provides an inkjet printing system, which includes a controller, an inkjet coding device, and a dual-voltage selection input circuit. The specific structure of the dual-voltage selection input circuit refers to the above-mentioned embodiments. Since this inkjet printing system adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Among them, the dual-voltage selection input circuit is respectively connected to the controller and the inkjet coding device, and the controller can be a PLC.

[0078] Optionally, the inkjet printing system may further include an encoder, which is connected to the dual-voltage selection input circuit to provide a pulse signal for the first input circuit in the dual-voltage selection input circuit.

[0079] The above are only optional embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the inventive concept of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A dual voltage selection input circuit, characterized in that: The dual voltage selection input circuit comprises: The first input circuit is used to output the input pulse signal; A first output circuit, used for connecting to a coding device; A second output circuit, used to connect to a controller; a multiplexing circuit, wherein a first input terminal is connected to the first input circuit, a first output terminal is connected to the first output circuit, and a second output terminal is connected to the second output circuit; The multiplexing circuit is used to control the first input circuit to output a first pulse signal to the inkjet device, and to control the second output circuit to output a second pulse signal to the controller according to the pulse signal output by the first input circuit; Wherein, the voltage value of the first pulse signal is smaller than the voltage value of the second pulse signal.

2. The dual voltage selection input circuit according to claim 1, characterized in that: The dual voltage selection input circuit also includes: A second input circuit, connected to the second input terminal of the multiplexing circuit, and configured to output the input pulse signal to the multiplexing circuit; A control signal input circuit connected to a controlled end of the multiplexing circuit, wherein the control signal input circuit outputs an input control signal to the multiplexing circuit; The multiplexing circuit is also used to control the first input circuit to output a first pulse signal to the inkjet device according to the pulse signal output by the second input circuit when a switching signal is received.

3. The dual voltage selection input circuit according to claim 1, characterized in that: The first input circuit includes: a first resistor, a second resistor, a third resistor, a first capacitor, a first diode, a first optocoupler and a first light emitting diode; The first resistor and the third end of the first optocoupler primary are respectively connected to corresponding pulse signals, the second end of the first resistor is connected to the first end of the first optocoupler primary, the first end and the second end of the second resistor are connected one-to-one with the first end and the third end of the first optocoupler primary, and the cathode and the anode of the first diode are connected one-to-one with the first end and the third end of the first optocoupler primary; the first end of the first optocoupler secondary is connected to a first preset power supply voltage, the second end of the first optocoupler secondary is the output end of the first input circuit, the second end of the first optocoupler secondary is connected to the first end of the third resistor, the third end of the first optocoupler secondary is grounded, and the first capacitor is connected between the first end and the third end of the first optocoupler secondary; the second end of the third resistor is connected to the anode of the first light-emitting diode, and the output end of the first light-emitting diode is grounded.

4. The dual voltage selection input circuit according to claim 3, characterized in that: The dual voltage selection input circuit further includes: a switch and a fourth resistor; The first end of the switch is connected to the first end of the first resistor, and the second end of the switch is connected to the first end of the primary side of the first optocoupler via the fourth resistor.

5. The dual voltage selection input circuit according to claim 2, characterized in that: The first input circuit, the control signal input circuit and the second input circuit have the same circuit structure.

6. The dual voltage selection input circuit according to claim 1, characterized in that: The first output circuit is used to output four first pulse signals, and the number of the first input circuit and the second output circuit is two.

7. The dual voltage selection input circuit according to claim 1, characterized in that: The second output circuit includes a fifth resistor, a sixth resistor, a second capacitor, a second optical coupler and a second light emitting diode; The first end of the second optocoupler primary side is connected to the multiplexing circuit via the fifth resistor, and the third end of the second optocoupler primary side is grounded; the first end of the second optocoupler secondary side is connected to the second preset power supply voltage; the second end of the second optocoupler secondary side is the output end of the second output circuit, and is connected to the first end of the sixth resistor; the second end of the sixth resistor is connected to the anode of the second light-emitting diode, and the cathode of the second light-emitting diode is connected to the third end of the second optocoupler secondary side; the second capacitor is connected between the first end and the third end of the second optocoupler secondary side; Wherein, the second preset supply voltage is equal to the voltage value of the second pulse signal.

8. The dual voltage selection input circuit according to claim 1, characterized in that: The voltage value of the first pulse signal is 5V, and the voltage value of the second pulse signal is 24V.

9. A dual voltage selection input module, characterized in that: It comprises a dual voltage selection input circuit as described in any one of claims 1 to 8.

10. A printing system, characterized in that: It comprises a controller, a coding device and a dual voltage selection input circuit as claimed in any one of claims 1 to 8; The dual voltage selection input circuit is connected to the controller and the inkjet device respectively.

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