Nozzle control panel electrical anomaly detection circuit, control panel and printer
By introducing an electrical anomaly detection circuit into the nozzle control board, the problem of damage caused by abnormal voltage to the nozzle control board is solved, realizing real-time monitoring and protection of voltage and current, and ensuring the stable operation of the nozzle control board.
Patent Information
- Application Number
- CN202422812830.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-19
AI Technical Summary
Damage to the printhead control board in inkjet printers caused by abnormal voltage, including undervoltage, overvoltage, overcurrent, short circuit, and other abnormal conditions, affects the stability of the system.
A nozzle control board electrical abnormality detection circuit was designed, including an input power overvoltage and undervoltage detection module, an overcurrent detection and power-on module, a nozzle JCOM short circuit detection module, and a nozzle VDD/VH short circuit detection module. The circuit uses comparators and MOS devices to detect voltage and current abnormalities and promptly shuts off the power supply to avoid damage.
It effectively detects and prevents damage to the nozzle control board due to abnormal voltage, improving the stability and reliability of the system and avoiding damage to the nozzles and their control boards.
Smart Images
Figure CN223565859U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to inkjet printing technical field especially, relate to a kind of nozzle control panel electric abnormality detection circuit, control panel and printer. BACKGROUND
[0002] In inkjet printer, due to the reasons such as design imperfection or installation operation bad, the following abnormal conditions of nozzle control panel are caused: input voltage under-voltage, overvoltage or short circuit, overcurrent, power shortage etc., which can cause system abnormal work, even cause nozzle control panel damage, in addition, output nozzle voltage short circuit etc. Also can cause system abnormal work, cause nozzle and its control panel damage. How to avoid printer to appear output voltage under-voltage, overvoltage, overcurrent, output nozzle voltage short circuit etc. Abnormal situation is the problem that printer industry needs to solve at present. SUMMARY
[0003] Therefore, the utility model embodiment provides nozzle control panel electric abnormality detection circuit, control panel and printer to solve the problem of nozzle control panel electric abnormality detection in prior art.
[0004] Firstly, the utility model embodiment provides a kind of nozzle control panel electric abnormality detection circuit, it is characterized in that, the circuit includes: input power overvoltage under-voltage detection module, overcurrent detection and power start module, nozzle JCOM short circuit detection module, nozzle VDD short circuit detection module and nozzle VH short circuit detection module, wherein the input power overvoltage under-voltage detection module is according to the first comparator and preset reference voltage check whether preset input voltage is overvoltage or under-voltage;The overcurrent detection and power start module are according to a plurality of sampling resistors and MOS device to judge whether the working current of the nozzle control panel of printer exceeds preset current threshold value and open or close preset power supply;The nozzle JCOM short circuit detection module is according to second comparator to detect whether nozzle JCOM power supply is short-circuited;The nozzle VDD short circuit detection module is according to third comparator to detect whether nozzle VDD power supply interface is short-circuited;The nozzle VH short circuit detection module is according to fourth comparator to detect whether nozzle VH power supply interface is short-circuited.
[0005] Preferably, the input power over-voltage and under-voltage detection module comprises a first comparator and its peripheral circuit, the first comparator comprises a first OUTA pin, a first negative INA pin, a first positive INA pin, a first negative voltage pin, a first positive voltage pin, a first OUTB pin, a first negative INB pin, a first positive INB pin, wherein the first OUTA pin is electrically connected with the first end of a first resistor, the second end of the first resistor is electrically connected with VCC voltage, the first negative INA pin is electrically connected with the first end of a second resistor, the second end of the second resistor is electrically connected with the preset input voltage, and the first positive INA pin is connected with the preset reference voltage; the first OUTB pin is electrically connected with the first end of a fourth resistor, the second end of the fourth resistor is connected with VCC voltage, the first negative INB pin is connected with the preset reference voltage, the first positive INB pin is electrically connected with the first end of a fifth resistor, and the second end of the fifth resistor is connected with the preset input voltage; the first OUTA pin and the first OUTB pin are respectively electrically connected with a first output interface and a second output interface.
[0006] Preferably, the over-current detection and power start module at least comprises an over-current detection unit and a power start unit electrically connected, wherein the over-current detection unit at least comprises a seventh resistor, an eighth resistor, a first PNP triode and a fifth field effect tube connected in parallel, when the working current passing through the seventh resistor and the eighth resistor is greater than or equal to the preset current threshold, the first PNP triode and the fifth field effect tube are turned on, the first preset interface electrically connected with the drain of the fifth field effect tube outputs low level, and it is judged as over-current; the power start unit at least comprises a first field effect tube and a fourth field effect tube, when the second preset interface electrically connected with the gate of the first field effect tube and the gate of the fourth field effect tube is low level, the first field effect tube and the fourth field effect tube are turned on, and the preset power interface is opened; when the second preset interface is low level, the first field effect tube and the fourth field effect tube are cut off, and the preset power interface is closed.
[0007] Preferably, the overcurrent detection unit further comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, wherein the first end of the ninth resistor is electrically connected with the base of the first PNP transistor, the second end of the ninth resistor is electrically connected with the second end of the parallel seventh resistor and eighth resistor, the first end of the parallel seventh resistor and eighth resistor is connected with a preset input voltage, the collector of the first PNP transistor is electrically connected with the first end of the tenth resistor, the second end of the tenth resistor is electrically connected with the first end of the eleventh resistor and the second end of the twelfth resistor respectively, the second end of the eleventh resistor is grounded, the first end of the twelfth resistor is electrically connected with the gate of the fifth field effect tube, the source of the fifth field effect tube is grounded, the drain of the fifth field effect tube is electrically connected with the second end of the thirteenth resistor, the first end of the thirteenth resistor is connected with VCC power supply, and the drain of the fifth field effect tube is also electrically connected with the first preset interface.
[0008] Preferably, the power supply starting unit further comprises a current mirror composed of a sixth field effect tube and a seventh field effect tube, and the sixth field effect tube and the seventh field effect tube are both enhancement mode N-channel field effect tubes.
[0009] Preferably, the shower head JCOM short circuit detection module comprises a second comparator and its peripheral circuit, and the second comparator comprises a second OUTA pin, a second negative INA pin, a second positive INA pin, a second negative voltage pin, a second positive voltage pin, a second OUTB pin, a second negative INB pin and a second positive INB pin, wherein the second OUTA pin is electrically connected with the second end of a twenty-third resistor, the first end of the twenty-third resistor is electrically connected with VCC voltage; the second negative INA pin and the second negative INB pin are electrically connected with the second end of a twenty-fourth resistor, the first end of the twenty-fourth resistor is electrically connected with a preset reference voltage; the second positive INA pin is electrically connected with the second end of a twenty-fifth resistor, the first end of the twenty-fifth resistor is electrically connected with a first shower head interface JCOM0; the second positive INB pin is electrically connected with the first end of a twenty-sixth resistor, the second end of the twenty-sixth resistor is electrically connected with a second shower head interface JCOM1; the second OUTB pin is electrically connected with the first end of a twenty-seventh resistor, the second end of the twenty-seventh resistor is electrically connected with VCC voltage; and the second OUTA pin and the second OUTB pin are also respectively electrically connected with a third shower head interface JCOM0_FB and a fourth shower head interface JCOM1_FB.
[0010] Preferably, the nozzle VDD short circuit detection module comprises a third comparator and peripheral circuit thereof, wherein the third comparator comprises a third OUTA pin, a third negative INA pin, a third positive INA pin, a third negative voltage pin, a third positive voltage pin, a third OUTB pin, a third negative INB pin, a third positive INB pin, the third OUTA pin and a second end of a twenty-eighth resistor are electrically connected, a first end of the twenty-eighth resistor is electrically connected with a VCC voltage, the third negative INA pin and the third negative INB pin are electrically connected with a preset reference voltage, the third positive INA pin is electrically connected with a second end of a twenty-ninth resistor, a first end of the twenty-ninth resistor is electrically connected with a fifth nozzle interface J0_3V3_FB, the third positive INB pin is electrically connected with a first end of a thirtieth resistor, a second end of the thirtieth resistor is electrically connected with the sixth nozzle interface J1_3V3_FB, and the third OUTA pin and the third OUTB pin are further electrically connected with a seventh nozzle interface JVC0_FB and an eighth nozzle interface JVC1_FB respectively.
[0011] Preferably, the nozzle VDD short circuit detection module comprises a third comparator and peripheral circuit thereof, wherein the third comparator comprises a third OUTA pin, a third negative INA pin, a third positive INA pin, a third negative voltage pin, a third positive voltage pin, a third OUTB pin, a third negative INB pin, a third positive INB pin, the third OUTA pin and a second end of a twenty-eighth resistor are electrically connected, a first end of the twenty-eighth resistor is electrically connected with a VCC voltage, the third negative INA pin and the third negative INB pin are electrically connected with a preset reference voltage, the third positive INA pin is electrically connected with a second end of a twenty-ninth resistor, a first end of the twenty-ninth resistor is electrically connected with a fifth nozzle interface J0_3V3_FB, the third positive INB pin is electrically connected with a first end of a thirtieth resistor, a second end of the thirtieth resistor is electrically connected with the sixth nozzle interface J1_3V3_FB, and the third OUTA pin and the third OUTB pin are further electrically connected with a seventh nozzle interface JVC0_FB and an eighth nozzle interface JVC1_FB respectively.
[0012] In a second aspect, the utility model embodiment provides a control panel, the control panel comprises the nozzle control panel electric anomaly detection circuit of any one of the first aspect.
[0013] In a third aspect, the utility model embodiment provides a printer, the printer comprises the nozzle control panel electric anomaly detection circuit of any one of the first aspect or the control panel of the second aspect.
[0014] In summary, the beneficial effects of the present application are as follows:
[0015] The printhead control board electric abnormality detection circuit, the control board and the printer provided by the embodiment of the present application include an input power overvoltage and undervoltage detection module, an overcurrent detection and power start module, a printhead JCOM short circuit detection module, a printhead VDD short circuit detection module and a printhead VH short circuit detection module. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme of the embodiment of the present application, the drawings needed to be used in the embodiment of the present application will be briefly introduced as follows, and for those skilled in the art, other drawings can also be obtained without creative labor on the premise of not paying the creative labor, and these are within the protection scope of the present application.
[0017] Figure 1 is a structural schematic diagram of the printhead control board electric abnormality detection circuit of the embodiment of the present application.
[0018] Figure 2 is a specific circuit diagram of the input power overvoltage and undervoltage detection module of the embodiment of the present application.
[0019] Figure 3 is a specific circuit diagram of the overcurrent detection and power start module of the embodiment of the present application.
[0020] Figure 4 is a specific circuit diagram of the printhead JCOM short circuit detection module of the embodiment of the present application.
[0021] Figure 5 is a specific circuit diagram of the printhead VDD short circuit detection module of the embodiment of the present application.
[0022] Figure 6 is a specific circuit diagram of the printhead VH short circuit detection of the embodiment of the present application. DETAILED DESCRIPTION
[0023] The features and exemplary embodiments of each aspect of the present application will be described in detail below, in order to make the purpose, technical scheme and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are configured only to explain the present application, and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by showing examples of the present application.
[0024] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements. The implementation described below is only illustrative, and the division of the modules or circuits is only a logical functional division, and actual implementation can have another division. In the present embodiment and the drawings, elements unrelated to the present application have been omitted and not shown, and the sizes of the elements in the drawings are only for easy understanding, not to limit the actual proportion.
[0025] Embodiment one
[0026] Please refer to Figure 1The utility model embodiment provides a kind of spray head control panel electric anomaly detection circuit 200, this circuit 200 includes input power overvoltage undervoltage detection module 201, overcurrent detection and power start module 202, spray head JCOM short circuit detection module 203, spray head VDD short circuit detection module 204 and spray head VH short circuit detection module 205, wherein, input power overvoltage undervoltage detection module 201 according to the first comparator and whether preset input voltage is overvoltage or undervoltage of preset reference voltage check;Overcurrent detection and power start module 202 according to several sampling resistors and MOS device determine whether the working current of spray head control panel exceeds preset current threshold and open or close preset power;Spray head JCOM short circuit detection module 203 according to second comparator detects whether spray head JCOM power is short-circuit;Spray head VDD short circuit detection module 204 according to third comparator detects whether spray head VDD power interface is short-circuit;Spray head VH short circuit detection module 205 according to fourth comparator detects whether spray head VH power interface is short-circuit.
[0027] In one embodiment, as Figure 2 It is the specific circuit diagram of input power overvoltage undervoltage detection module 201, as Figure 2As shown, the input power overvoltage and undervoltage detection module 201 includes a first comparator U3 and its peripheral circuit, the first comparator U3 includes a first OUTA pin, a first negative INA pin, a first positive INA pin, a first negative voltage pin, a first positive voltage pin, a first OUTB pin, a first negative INB pin, a first positive INB pin, wherein the first OUTA pin is electrically connected with the first end of a first resistor R29, the second end of the first resistor R29 is connected with a VCC voltage, the first negative INA pin is electrically connected with the first end of a second resistor R38, the second end of the second resistor R38 is connected with the preset input voltage, the first negative INA pin is also electrically connected with the first end of a third resistor R39 and the first end of a first capacitor C26 respectively, the second end of the third resistor R39 and the second end of the first capacitor C26 are both grounded; the first positive INA pin is connected with the preset reference voltage, the first positive INA pin is also electrically connected with the first end of a second capacitor C27, the second end of the second capacitor C27 is grounded; the first negative voltage pin is grounded; the first positive voltage pin is connected with a 5V positive voltage, the first positive voltage pin is also electrically connected with the first end of a third capacitor C22, the second end of the third capacitor C22 is grounded; the first OUTB pin is electrically connected with the first end of a fourth resistor R30, the second end of the fourth resistor R30 is connected with a VCC voltage, the first negative INB pin is connected with the preset reference voltage, the first positive INB pin is electrically connected with the first end of a fifth resistor R50, the second end of the fifth resistor R50 is connected with the preset input voltage; the first positive INB pin is also electrically connected with the first end of a sixth resistor R44 and the first end of a fourth capacitor C28 respectively, the second end of the sixth resistor R44 and the second end of the fourth capacitor C28 are both grounded, the first OUTA pin and the first OUTB pin are electrically connected with a first output interface and a second output interface respectively.
[0028] In one example, taking a 42V input power supply as an example, the first comparator U3 and a preset reference voltage of 2.5V are used to detect whether there is undervoltage or overvoltage at the 42V input. Under normal circumstances, when the preset input voltage connected to the first negative INA pin and the first positive INB pin is 42V, the control board works normally. However, when the preset input voltage is higher or lower than a certain value, it is considered overvoltage or undervoltage, which will cause the control board to malfunction. In this example, when the preset input voltage exceeds 45V, the inverting input (first negative INA pin) of the first comparator U3 is greater than the 2.5V preset reference voltage at the non-inverting input (first positive INA pin). At this time, the first output interface PW_OVER_FB of the first OUTA pin of the first comparator U3 outputs a low level, which is judged as an overvoltage abnormality. When the preset input voltage is lower than 36V, the non-inverting input (first positive INB pin) of the first comparator U3 is less than the 2.5V preset reference voltage at the inverting input (first negative INB pin). The second output interface PW_FB of the first OUTB pin of the first comparator U3 outputs a low level, which is judged as an undervoltage abnormality.
[0029] In one embodiment, such as Figure 3 As shown, the overcurrent detection and power-on module 202 includes at least an overcurrent detection unit 31 and a power-on unit 32 that are electrically connected.
[0030] Specifically, such as Figure 3 As shown, the overcurrent detection unit 31 includes: a seventh resistor R8, an eighth resistor R9, a first PNP transistor Q3, and a fifth field-effect transistor. The unit also includes a ninth resistor R11, a tenth resistor R16, an eleventh resistor R23, a twelfth resistor R20, and a thirteenth resistor R15. The first terminal of the ninth resistor R11 is electrically connected to the base of the first PNP transistor Q3, and the second terminal of the ninth resistor R11 is electrically connected to the second terminals of the parallel seventh resistor R8 and the eighth resistor R9. The first terminals of the parallel seventh resistor R8 and the eighth resistor R9 are connected to a preset input voltage. The collector of the first PNP transistor Q3... The first terminal of the tenth resistor R16 is electrically connected to the first terminal of the eleventh resistor R23 and the second terminal of the twelfth resistor R20. The second terminal of the eleventh resistor R23 is grounded. The first terminal of the twelfth resistor R20 is electrically connected to the gate of the fifth field-effect transistor Q5. The source of the fifth field-effect transistor Q5 is grounded. The drain of the fifth field-effect transistor Q5 is electrically connected to the second terminal of the thirteenth resistor R15. The first terminal of the thirteenth resistor R15 is connected to the VCC power supply. The drain of the fifth field-effect transistor Q5 is also electrically connected to the first preset interface.
[0031] The power supply starting unit 32 comprises a first field effect transistor Q1 and a fourth field effect transistor Q4, a second PNP type transistor Q2, a fifth capacitor C5, a first Schottky diode D52, a fourteenth resistor R10, a fifteenth resistor R13, a second Schottky diode D10, a first polarity capacitor C6, a sixteenth resistor R14, a seventeenth resistor R17, an eighteenth resistor R19, a nineteenth resistor R26, a twentieth resistor R27, a twenty-first resistor R397 and a twenty-second resistor R12, and a sixth field effect transistor Q6 and a seventh field effect transistor Q7. The first end of the twenty-second resistor R12 is electrically connected to the second ends of the seventh resistor R8 and the eighth resistor R9 in parallel in the overcurrent detection unit, the second end of the twenty-second resistor R12 is electrically connected to the base of the second PNP type transistor and the first end of the twenty-first resistor R397 respectively, the collector of the second PNP type transistor Q2 is electrically connected to the first end of the fifteenth resistor R13, the second end of the fifteenth resistor R13 is electrically connected to the positive pole of the first Schottky diode D52, the second end of the fourteenth resistor R10, and the gate of the first field effect transistor Q1, the negative pole of the Schottky diode D52 is electrically connected to the second end of the fifth capacitor C5, the emitter of the second PNP type transistor Q2, the first end of the fifth capacitor C5, the first end of the fourteenth resistor, and the source of the first field effect transistor Q1 are electrically connected to the second ends of the seventh resistor R8 and the eighth resistor R9 in parallel in the overcurrent detection unit; the drain of the first field effect transistor Q1 is connected to the preset power supply interface and is also electrically connected to the positive pole of the second Schottky diode D10; the negative pole of the second Schottky diode D10 is electrically connected to the positive pole of the first polarity capacitor C6, and the negative pole of the first polarity capacitor C6 is grounded; the first end of the sixteenth resistor R14 is electrically connected to the first field effect transistor Q1, the second end of the sixteenth resistor R14 is electrically connected to the drain of the fourth field effect transistor Q4, the source of the fourth field effect transistor Q4 is grounded, the gate of the fourth field effect transistor Q4 is electrically connected to the seventeenth resistor R17, the first end of the seventeenth resistor R17 is connected to a VCC voltage, the first end of the eighteenth resistor R19 is also connected to a VCC voltage, the second end of the eighteenth resistor R19 is electrically connected to the second end of the nineteenth resistor R26 and the first end of the twentieth resistor R27 respectively, the first end of the nineteenth resistor R26 is electrically connected to the gate of the sixth field effect transistor Q6, the second end of the twentieth resistor R27 is electrically connected to the gate of the seventh field effect transistor Q7, the source of the sixth field effect transistor Q6 and the source of the seventh field effect transistor Q7 are both grounded, the drain of the sixth field effect transistor Q6 is electrically connected to the second end of the twenty-first resistor R397, the drain of the seventh field effect transistor Q7 is electrically connected to the gate of the fourth field effect transistor, and the sixth field effect transistor Q6 and the seventh field effect transistor Q7 form a current mirror.
[0032] like Figure 3 As shown, a preset input voltage of 42V is connected to one end of the seventh resistor R8 and the ninth resistor R9 to detect the operating current of the control board. When the current through the seventh resistor R8 and the ninth resistor R9 is greater than or equal to the preset current threshold, the first PNP transistor Q3 and the fifth field-effect transistor Q5 are turned on, the first preset interface PW01_OC_FB outputs a low level, and the system judges it as an overcurrent. When the system outputs a low level at the second preset interface P01_42V_SW, the first MOSFET Q1 and the fourth MOSFET Q4 are turned on, and the preset power interface PW01_42V of the subsequent stage is turned on. Conversely, when the system outputs a high level at the second preset interface P01_42V_SW, the first MOSFET Q1 and the fourth MOSFET Q4 are turned off or not turned on, and the preset power interface PW01_42V of the subsequent stage is turned off. Therefore, when the system detects an abnormality, the second preset interface P01_42V_SW can be controlled to be at a high level, at which time the preset power interface PW01_42V is turned off, thereby turning off the power input and avoiding damage to the control board. When there is no abnormality, the second preset interface P01_42V_SW is kept at a low level, keeping the preset power interface PW01_42V on, thereby turning on the power input.
[0033] Preferably, in the overcurrent detection and power-on module 202, the fifth field-effect transistor Q5, the first field-effect transistor Q1, the fourth field-effect transistor Q4, the sixth field-effect transistor Q6, and the seventh field-effect transistor Q7 are all enhancement-mode N-channel field-effect transistors.
[0034] In one embodiment, such as Figure 4As shown, the shower head JCOM short circuit detection module 203 includes a second comparator U50 and its peripheral circuit, the second comparator U50 includes a second OUTA pin, a second negative INA pin, a second positive INA pin, a second negative voltage pin, a second positive voltage pin, a second OUTB pin, a second negative INB pin, a second positive INB pin, wherein the second OUTA pin is electrically connected with the second end of the twenty-third resistor R272, the first end of the twenty-third resistor R272 is electrically connected with the VCC voltage; the second negative INA pin and the second negative INB pin are electrically connected with the second end of the twenty-fourth resistor R293, the first end of the twenty-fourth resistor is electrically connected with the preset reference voltage; the second positive INA pin is electrically connected with the second end of the twenty-fifth resistor R277, the first end of the twenty-fifth resistor R277 is electrically connected with the first shower head interface JCOM0; the second positive INB pin is electrically connected with the first end of the twenty-sixth resistor R291, the second end of the twenty-sixth resistor R291 is electrically connected with the second shower head interface JCOM1; the second OUTB pin is electrically connected with the first end of the twenty-seventh resistor R291, the second end of the twenty-seventh resistor R291 is electrically connected with the VCC voltage; the second OUTA pin and the second OUTB pin are also respectively electrically connected with the third shower head interface JCOM0_FB and the fourth shower head interface JCOM1_FB.
[0035] For example, when the voltage in the first shower head interface JCOM0 is lower than 1V, the voltage of the same phase input end (the second positive INA pin) of the second comparator U50 is less than the 2.5V preset reference voltage of the opposite phase input end (the second negative INA pin) of the second comparator U50, the third shower head interface JCOM0_FB electrically connected with the second OUTA pin of the second comparator U50 outputs low level; similarly, when the voltage in the second shower head interface JCOM1 is lower than 1V, the voltage of the same phase input end (the second positive INB pin) of the second comparator U50 is less than the 2.5V preset reference voltage of the opposite phase input end (the second negative INB pin) of the second comparator U50, the fourth shower head interface JCOM1_FB electrically connected with the third OUTB pin of the second comparator U50 outputs low level, when the system detects that the output bit is low level, it is judged that the first shower head interface JCOM0 and the second shower head interface JCOM1 are short-circuited.
[0036] In one embodiment, as Figure 5As shown, the nozzle VDD short circuit detection module 204 includes a third comparator U17 and its peripheral circuit, wherein the third comparator U17 includes a third OUTA pin, a third negative INA pin, a third positive INA pin, a third negative voltage pin, a third positive voltage pin, a third OUTB pin, a third negative INB pin, and a third positive INB pin, wherein the third OUTA pin is electrically connected with the second end of the twenty-eighth resistor R161, the first end of the twenty-eighth resistor R161 is electrically connected with the VCC voltage, the third negative INA pin and the third negative INB pin are both electrically connected with a preset reference voltage, the third positive INA pin is electrically connected with the second end of the twenty-ninth resistor R163, the first end of the twenty-ninth resistor R163 is electrically connected with the fifth nozzle interface J0_3V3_FB, the third positive INB pin is electrically connected with the first end of the thirtieth resistor R164, the second end of the thirtieth resistor R164 is electrically connected with the sixth nozzle interface J1_3V3_FB, and the third OUTA pin and the third OUTB pin are further electrically connected with the seventh nozzle interface JVC0_FB and the eighth nozzle interface JVC1_FB respectively.
[0037] For example, when the VDD voltage in the fifth nozzle interface J0_3V3_FB is lower than 2.5V, the voltage of the same phase input end (the third positive INA pin) of the third comparator U17 is less than the 2.5V preset reference voltage of the opposite phase input end (the third negative INA pin) of the third comparator U17, the seventh nozzle interface JVC0_FB electrically connected with the third OUTA pin of the third comparator U17 outputs low level; similarly, when the VDD voltage in the sixth nozzle interface J1_3V3_FB is lower than 2.5V, the voltage of the same phase input end (the third positive INB pin) of the third comparator U17 is less than the 2.5V preset reference voltage of the opposite phase input end (the third negative INB pin) of the third comparator U17, the eighth nozzle interface JVC1_FB electrically connected with the third OUTB pin of the third comparator U17 outputs low level, and when the system detects that the output bit is low level, it is judged that the nozzle VDD interface is short-circuited.
[0038] As Figure 6As shown, the shower head VH short circuit detection module 205 includes a fourth comparator and its peripheral circuit, wherein the fourth comparator includes a fourth OUTA pin, a fourth negative INA pin, a fourth positive INA pin, a fourth negative voltage pin, a fourth positive voltage pin, a fourth OUTB pin, a fourth negative INB pin, a fourth positive INB pin, the fourth OUTA pin is electrically connected with the second end of the thirty-first resistor R165, the first end of the thirty-first resistor R165 is electrically connected with VCC voltage, the fourth OUTB pin is electrically connected with the second end of the thirty-second resistor R166, the first end of the thirty-second resistor R166 is electrically connected with VCC voltage, the fourth negative INA pin and the fourth negative INB pin are respectively connected with the preset reference voltage, the fourth positive INA pin is electrically connected with the second end of the thirty-third resistor R167, the first end of the thirty-third resistor R167 is electrically connected with the ninth shower head interface J0_42_FB, the fourth positive INB pin is electrically connected with the first end of the thirty-fourth resistor R168, the second end of the thirty-fourth resistor R168 is electrically connected with the tenth shower head interface J1_42_FB, and the fourth OUTA pin and the fourth OUTB pin are respectively electrically connected with the eleventh shower head interface PW0_FB and the twelfth shower head interface PW1_FB.
[0039] For example, when the VH voltage in the ninth shower head interface J0_42V_FB is lower than 27.5V, the voltage of the fourth comparator U20 same phase input end (the fourth positive INA pin) is less than the 2.5V preset reference voltage of the fourth comparator U20 opposite phase input end (the fourth negative INA pin), the eleventh shower head interface PW0_FB electrically connected with the fourth OUTA pin of the fourth comparator U20 outputs low level; similarly, when the VH voltage in the tenth shower head interface J1_42V_FB is lower than 27.5V, the voltage of the fourth comparator U20 same phase input end (the fourth positive INB pin) is less than the 2.5V preset reference voltage of the fourth comparator U20 opposite phase input end (the fourth negative INB pin), the twelfth shower head interface PW1_FB electrically connected with the fourth OUTB pin of the fourth comparator U20 outputs low level, when the system detects that the output bit is low level, it is judged that the shower head VH interface is short-circuited.
[0040] In summary, the spray head control panel electric abnormality detection circuit provided by the embodiment of the utility model, including input power overvoltage undervoltage detection module, overcurrent detection and power start module, spray head JCOM short circuit detection module, spray head VDD short circuit detection module and spray head VH short circuit detection module, wherein, input power overvoltage detection module can detect whether the power supply input to the spray head control panel appears overvoltage or undervoltage and other abnormal conditions, overcurrent detection and power start module can detect whether the working current of the spray head control point exceeds the preset current threshold, when exceeding the preset current threshold, i.e. overcurrent, the power supply will be closed, thereby avoiding the damage of the spray head control panel;Spray head JCOM short circuit detection module can detect whether the spray head JCOM power supply is short-circuited;The spray head VDD short circuit detection module is used for detecting whether the spray head VDD power supply is short-circuited;The spray head VH short circuit detection module is used for detecting whether the spray head VH power supply is short-circuited, when detecting that the spray head power supply is short-circuited, the corresponding power supply can be turned off in time, avoiding the damage of the spray head or the control panel.
[0041] Embodiment two
[0042] The utility model embodiment two provides a control panel, this control panel at least includes like the spray head control panel electric abnormality detection circuit of implementation one, this circuit includes input power overvoltage undervoltage detection module, overcurrent detection and power start module, spray head JCOM short circuit detection module, spray head VDD short circuit detection module and spray head VH short circuit detection module, wherein, input power overvoltage detection module can detect whether the power supply input to the spray head control panel appears overvoltage or undervoltage and other abnormal conditions, overcurrent detection and power start module can detect whether the working current of the spray head control point exceeds the preset current threshold, when exceeding the preset current threshold, i.e. overcurrent, the power supply will be closed, thereby avoiding the damage of the spray head control panel;Spray head JCOM short circuit detection module can detect whether the spray head JCOM power supply is short-circuited;The spray head VDD short circuit detection module is used for detecting whether the spray head VDD power supply is short-circuited;The spray head VH short circuit detection module is used for detecting whether the spray head VH power supply is short-circuited, when detecting that the spray head power supply is short-circuited, the corresponding power supply can be turned off in time, avoiding the damage of the spray head or the control panel.
[0043] Embodiment three
[0044] The utility model discloses a printer, the printer includes the print head control panel electric abnormality detection circuit as described in the embodiment one or the control panel as described in the embodiment two, the circuit or control panel includes input power overvoltage undervoltage detection module, overcurrent detection and power start module, print head JCOM short circuit detection module, print head VDD short circuit detection module and print head VH short circuit detection module, wherein, input power overvoltage voltage detection module can detect whether the power supply that input to print head control panel appears overvoltage or undervoltage etc. Abnormal condition, overcurrent detection and power start module can detect whether the working current of print head control point exceeds the preset current threshold value, when exceeding the preset current threshold value, namely when overcurrent, then will close power supply, thereby avoiding print head control panel damage, print head JCOM short circuit detection module can detect whether print head JCOM power supply is short-circuited, print head VDD short circuit detection module is used for detecting whether print head VDD power supply is short-circuited, print head VH short circuit detection module is used for detecting whether print head VH power supply is short-circuited, when detecting these print head power supply short-circuit, can shut off corresponding power supply in time, avoids print head and its control panel damage.
[0045] The print head control panel electric abnormality detection circuit provided by the utility model is introduced in detail above, and those skilled in the art will further understand that various illustrative logic blocks, modules, circuits and algorithm steps described in combination with the embodiments disclosed in the present text can be implemented as electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the various illustrative components, blocks, modules, circuits and steps are described above in terms of functionality. Whether the functionality is implemented as hardware or software depends on the specific use and design constraints imposed on the entire system. Those skilled in the art can implement the described functionality in different ways for each specific use, and any equivalent structure or process transformation made with the contents of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model. It should not be understood as a limitation of the utility model.
[0046] The above is only a specific implementation method of the utility model, and those skilled in the art can clearly understand that, in order to describe conveniently and concisely, the specific working process of the above-mentioned system, module and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here. It should be understood that the protection scope of the utility model is not limited to this, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered within the protection scope of the utility model.
Claims
1. A nozzle control board electrical anomaly detection circuit, characterized in that, The circuit comprises: an input power overvoltage and undervoltage detection module, an overcurrent detection and power start module, a nozzle JCOM short circuit detection module, a nozzle VDD short circuit detection module and a nozzle VH short circuit detection module, wherein the input power overvoltage and undervoltage detection module checks whether the preset input voltage is overvoltage or undervoltage according to a first comparator and a preset reference voltage; the overcurrent detection and power start module judges whether the working current of the nozzle control board of the printer exceeds the preset current threshold and turns on or off the preset power supply according to a plurality of sampling resistors and MOS devices; the nozzle JCOM short circuit detection module detects whether the nozzle JCOM power supply is short-circuited according to a second comparator; the nozzle VDD short circuit detection module detects whether the nozzle VDD power supply interface is short-circuited according to a third comparator; and the nozzle VH short circuit detection module detects whether the nozzle VH power supply interface is short-circuited according to a fourth comparator.
2. The showerhead control plate electrical anomaly detection circuit of claim 1, wherein, The input power overvoltage and undervoltage detection module comprises a first comparator and its peripheral circuit, and the first comparator comprises a first OUTA pin, a first negative INA pin, a first positive INA pin, a first negative voltage pin, a first positive voltage pin, a first OUTB pin, a first negative INB pin and a first positive INB pin, wherein the first OUTA pin is electrically connected with the first end of a first resistor, the second end of the first resistor is electrically connected with a VCC voltage, the first negative INA pin is electrically connected with the first end of a second resistor, the second end of the second resistor is electrically connected with the preset input voltage, and the first positive INA pin is connected with the preset reference voltage; the first OUTB pin is electrically connected with the first end of a fourth resistor, the second end of the fourth resistor is connected with a VCC voltage, the first negative INB pin is connected with the preset reference voltage, the first positive INB pin is electrically connected with the first end of a fifth resistor, and the second end of the fifth resistor is connected with the preset input voltage; and the first OUTA pin and the first OUTB pin are respectively electrically connected with a first output interface and a second output interface.
3. The showerhead control plate electrical anomaly detection circuit of claim 1, wherein, The overcurrent detection and power start module at least comprises an overcurrent detection unit and a power start unit which are electrically connected, wherein the overcurrent detection unit at least comprises a seventh resistor, an eighth resistor, a first PNP type triode and a fifth field effect tube which are connected in parallel, when the working current passing through the seventh resistor and the eighth resistor is greater than or equal to the preset current threshold, the first PNP type triode and the fifth field effect tube are turned on, the first preset interface which is electrically connected with the drain of the fifth field effect tube outputs a low level, and it is judged that overcurrent occurs; and the power start unit at least comprises a first field effect tube and a fourth field effect tube, when the second preset interface which is electrically connected with the gate of the first field effect tube and the gate of the fourth field effect tube is at a low level, the first field effect tube and the fourth field effect tube are turned on, the preset power supply interface is turned on, when the second preset interface is at a low level, the first field effect tube and the fourth field effect tube are turned off, and the preset power supply interface is turned off.
4. The showerhead control plate electrical anomaly detection circuit of claim 3, wherein, The overcurrent detection unit further comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a thirteenth resistor, wherein a first end of the ninth resistor is electrically connected with a base of the first PNP transistor, a second end of the ninth resistor is electrically connected with second ends of the seventh resistor and the eighth resistor in parallel, first ends of the seventh resistor and the eighth resistor are connected with a preset input voltage, a collector of the first PNP transistor is electrically connected with a first end of the tenth resistor, a second end of the tenth resistor is electrically connected with a first end of the eleventh resistor and a second end of the twelfth resistor respectively, a second end of the eleventh resistor is grounded, a first end of the twelfth resistor is electrically connected with a gate of the fifth field effect transistor, a source of the fifth field effect transistor is grounded, a drain of the fifth field effect transistor is electrically connected with a second end of the thirteenth resistor, a first end of the thirteenth resistor is connected with a VCC power supply, and the drain of the fifth field effect transistor is also electrically connected with the first preset interface.
5. The showerhead control plate electrical anomaly detection circuit of claim 3, wherein, The power supply starting unit further comprises a current mirror composed of a sixth field effect transistor and a seventh field effect transistor, and the sixth field effect transistor and the seventh field effect transistor are both enhancement mode N-channel field effect transistors.
6. The showerhead control plate electrical anomaly detection circuit of claim 1, wherein, The nozzle JCOM short circuit detection module comprises a second comparator and a peripheral circuit thereof, and the second comparator comprises a second OUTA pin, a second negative INA pin, a second positive INA pin, a second negative voltage pin, a second positive voltage pin, a second OUTB pin, a second negative INB pin and a second positive INB pin, wherein the second OUTA pin is electrically connected with a second end of a twenty-third resistor, a first end of the twenty-third resistor is electrically connected with a VCC voltage; the second negative INA pin and the second negative INB pin are electrically connected with a second end of a twenty-fourth resistor, a first end of the twenty-fourth resistor is electrically connected with a preset reference voltage; the second positive INA pin is electrically connected with a second end of a twenty-fifth resistor, a first end of the twenty-fifth resistor is electrically connected with a first nozzle interface JCOM0; the second positive INB pin is electrically connected with a first end of a twenty-sixth resistor, a second end of the twenty-sixth resistor is electrically connected with a second nozzle interface JCOM1; the second OUTB pin is electrically connected with a first end of a twenty-seventh resistor, a second end of the twenty-seventh resistor is electrically connected with a VCC voltage; and the second OUTA pin and the second OUTB pin are also electrically connected with a third nozzle interface JCOM0_FB and a fourth nozzle interface JCOM1_FB respectively.
7. The showerhead control plate electrical anomaly detection circuit of claim 1, wherein, The nozzle VDD short circuit detection module includes a third comparator and its peripheral circuit, wherein the third comparator includes a third OUTA pin, a third negative INA pin, a third positive INA pin, a third negative voltage pin, a third positive voltage pin, a third OUTB pin, a third negative INB pin, and a third positive INB pin, the third OUTA pin is electrically connected with a second end of a twenty-eighth resistor, a first end of the twenty-eighth resistor is electrically connected with a VCC voltage, the third negative INA pin and the third negative INB pin are electrically connected with a preset reference voltage, the third positive INA pin is electrically connected with a second end of a twenty-ninth resistor, a first end of the twenty-ninth resistor is electrically connected with a fifth nozzle interface J0_3V3_FB, the third positive INB pin is electrically connected with a first end of a thirtieth resistor, a second end of the thirtieth resistor is electrically connected with a sixth nozzle interface J1_3V3_FB, the third OUTA pin and the third OUTB pin are further electrically connected with a seventh nozzle interface JVC0_FB and an eighth nozzle interface JVC1_FB respectively.
8. The showerhead control plate electrical anomaly detection circuit of claim 1, wherein, The nozzle VH short circuit detection module includes a fourth comparator and its peripheral circuit, wherein the fourth comparator includes a fourth OUTA pin, a fourth negative INA pin, a fourth positive INA pin, a fourth negative voltage pin, a fourth positive voltage pin, a fourth OUTB pin, a fourth negative INB pin, and a fourth positive INB pin, the fourth OUTA pin is electrically connected with a second end of a thirty-first resistor, a first end of the thirty-first resistor is electrically connected with a VCC voltage, the fourth OUTB pin is electrically connected with a second end of a thirty-second resistor, a first end of the thirty-second resistor is electrically connected with a VCC voltage, the fourth negative INA pin and the fourth negative INB pin are connected with the preset reference voltage respectively, the fourth positive INA pin is electrically connected with a second end of a thirty-third resistor, a first end of the thirty-third resistor is electrically connected with a ninth nozzle interface J0_42_FB, the fourth positive INB pin is electrically connected with a first end of a thirty-fourth resistor, a second end of the thirty-fourth resistor is electrically connected with a tenth nozzle interface J1_42_FB, the fourth OUTA pin and the fourth OUTB pin are electrically connected with an eleventh nozzle interface PW0_FB and a twelfth nozzle interface PW1_FB respectively.
9. A control panel, characterized by The control board includes the nozzle control board electrical abnormality detection circuit according to any one of claims 1-8.
10. A printer characterized by comprising: The printer includes the nozzle control board electrical abnormality detection circuit according to any one of claims 1-8 or the control board according to claim 9.