CN114103452A - MPU chip or MCU chip - Google Patents

Abstract

The application relates to the technical field of printers, in particular to an MPU chip or an MCU chip, which can check whether a user uses a non-original cracking circuit and original ink or not to improve the cracking prevention capability of a printer or an ink box (namely a printing material box). The MPU or MCU chip includes: a frequency divider for generating a target heat pulse signal; the clock chip RTC or the crystal oscillator is used for generating a target clock signal; a latch-comparator circuit for generating a target voltage threshold signal; the detection signal comprises at least one of a target heat pulse signal, a target clock signal and a target voltage threshold signal; the operation unit is used for calculating a corresponding reference result according to the detection signal; and identifying whether the target object is genuine by comparing the detection result output by the liquid remaining amount detecting unit with the reference result.

Description

MPU chip or MCU chip

Technical Field

The application relates to the technical field of printers, in particular to an MPU chip or an MCU chip.

Background

A residual liquid level detection circuit (i.e., a liquid residual amount detection unit) is generally provided in the printer to detect the position of the residual liquid of the printing material (e.g., printing ink) in the printing material cartridge (also referred to as a print cartridge, a toner cartridge, an ink cartridge, etc.). At present, part of users use a non-original ink box to replace original ink, but the non-original ink box uses a cracked residual liquid level detection circuit to detect the ink amount of the printer, however, the cracked residual liquid level detection circuit can not be matched with the original printer under many conditions, so that the printer can not accurately predict the residual ink amount, and the printer is damaged or the service life of the printer is reduced.

In view of the above, a solution is needed to solve the above problems.

Disclosure of Invention

The embodiment of the application provides a printing device, a chip, a printer-based cracking prevention method and a storage medium, and designs a cracking prevention device and a cracking prevention method to check whether a user uses a cracking circuit which is not originally installed or not so as to improve the cracking prevention capability of a printer and an ink box.

In a first aspect, an embodiment of the present application provides a printing apparatus, which is used for verifying a liquid remaining amount detection unit, and includes a printer control unit; a printer control unit for generating a calibration parameter; a liquid remaining amount detection unit for detecting the remaining amount of the printing material in the printing material cartridge based on the input detection signal and outputting the detection result to the printer control unit; wherein, the detection signal is generated according to the check parameter; the printer control unit is also used for acquiring a reference result corresponding to the detection signal and identifying whether the target object is original by comparing the detection result with the reference result; the target object includes a liquid remaining amount detection unit. The anti-cracking method provided by the application not only can detect whether the liquid allowance detection unit is a cracking circuit, but also can detect whether the ink is original ink and whether the MCU chip and the MPU chip are cracking circuits.

In one embodiment, the device further comprises a cartridge chip; the printer control unit is also used for transmitting the verification parameters to the ink box chip; and the ink box chip is used for generating a corresponding detection signal according to the verification parameter so as to drive the liquid allowance detection unit. In this mode, the verification parameters are generated by the printer (i.e., the printing device), the detection signals are generated by the cartridge chip, and finally the design completed by the printer is verified, so that whether the cartridge chip and the liquid remaining amount detection unit are the cracking circuit can be verified at the same time.

In one embodiment, the device further comprises a cartridge chip; the printer control unit is also used for generating a corresponding detection signal according to the verification parameter and transmitting the detection signal to the ink box chip; and the ink box chip is used for obtaining a detection result corresponding to the detection signal according to the detection signal and transmitting the detection result to the printer control unit. In the mode, the design that the generation and the verification of the verification parameters and the detection signals are completed by the printer (namely, the printing device) can greatly improve the anti-cracking effect, so that key information cannot be intercepted from the communication between the printer and the ink box chip, and the cracking difficulty is increased.

In one embodiment, the liquid remaining amount detecting unit is configured to detect a remaining amount of the printing material in the printing material cartridge based on an input original heat pulse signal, an original clock signal, and an original voltage threshold signal, and output a detection result; a detection signal including at least one of a target heat pulse signal, a target clock signal, and a target voltage threshold signal; the target heat pulse signal, the target clock signal and the target voltage threshold signal are obtained by modifying the original heat pulse signal, the original clock signal and the original voltage threshold signal respectively.

In one embodiment, the verification parameters include at least one of a first verification parameter, a second verification parameter, and a third verification parameter;

wherein the first verification parameter is used for modifying the peak value and/or the first duty ratio of the original heat pulse signal; in the mode, the duty ratio or the peak value of the heat pulse signal is simply controlled, namely the working high level duration of the heating element or the amplitude (first checking parameter) of the high level is controlled, the heat pulse signal (detection signal) is changed, the detection results (the number of rising edges) which correspond to the checking parameter and the detection signal one by one are generated, and the printer checks the detection results to realize the anti-cracking effect;

a second calibration parameter for modifying a period and/or a second duty cycle of the original clock signal; in this way, the duty ratio or the period (second check parameter) of the counting clock (sampling clock signal) is simply controlled, the original clock signal is changed to obtain the detection signal, and then the detection results (the number of rising edges) corresponding to the check parameter and the detection signal one by one are output, and the printer checks the detection results to realize the anti-cracking effect;

the third verification parameter is used for modifying the voltage value of the original voltage threshold signal; in this manner, by simply controlling the threshold voltage setting (third verification parameter), the threshold voltage signal (detection signal) is changed, the detection results (the number of rising edges) corresponding to the verification parameter and the detection signal one to one are generated, and the printer verifies the detection results to realize the effect of preventing cracking. In one embodiment, the apparatus further comprises: a timer for generating a target heat pulse signal; the frequency divider or the clock chip RTC or the crystal oscillator is used for generating a target clock signal; a latch-comparator circuit for generating a target voltage threshold signal.

In a second aspect, embodiments of the present application provide an MPU chip for verifying a liquid remaining amount detection unit; the liquid residual amount detection unit is used for detecting the residual amount of the printing material in the printing material box based on an input detection signal and outputting a detection result; wherein, the detection signal is generated according to the check parameter;

the MPU chip is specifically used for outputting the verification parameters; and acquiring a detection result output by the liquid residual amount detection unit and a reference result corresponding to the detection signal, and identifying whether the liquid residual amount detection unit is a cracking circuit or not by comparing the detection result with the reference result. The MPU chip that this application provided not only can detect whether liquid surplus detecting element is for cracking the circuit, can also detect the ink and whether for original dress ink.

In one possible implementation, the MPU chip includes an arithmetic unit; and the operation unit is used for calculating a corresponding reference result according to the detection signal.

In one embodiment, the arithmetic unit includes an AI module; and the AI module is used for calculating a corresponding reference result according to the heat dissipation relation respectively corresponding to the detection signal, the printing material and the air. In the mode, the introduction of the AI module greatly improves the efficiency of data processing of the detection result.

In one possible embodiment, the arithmetic unit comprises: any one of a comparator, a D-type trigger and an analog-to-digital converter (ADC); or, a combination of the comparator and the analog-to-digital converter ADC; or, a combination of the class D flip-flop and the analog-to-digital converter ADC. In this way, the arithmetic unit is realized by adopting various circuit combinations, so that the other party cannot accurately predict the structure of the arithmetic unit, further cannot crack or imitate, and the crack prevention capability can be improved.

In a third aspect, an embodiment of the present application provides an MCU chip, where the MCU chip is used to verify a liquid remaining amount detection unit; the liquid residual amount detection unit is used for detecting the residual amount of the printing material in the printing material box based on an input detection signal and outputting a detection result; wherein, the detection signal is generated according to the check parameter; the MCU chip is specifically used for outputting the verification parameters; and acquiring a detection result output by the liquid residual amount detection unit and a reference result corresponding to the detection signal, and identifying whether the liquid residual amount detection unit is a cracking circuit or not by comparing the detection result with the reference result. The application provides an MCU chip not only can detect whether liquid surplus detecting element is for cracking the circuit, can also detect whether the ink is original dress ink.

In one embodiment, the MCU chip is mounted on the printing material cartridge.

In one implementation, the MCU chip comprises an arithmetic unit; and the operation unit is used for calculating a corresponding reference result according to the detection signal.

In one embodiment, the arithmetic unit includes an AI module; and the AI module is used for calculating a corresponding reference result according to the heat dissipation relation respectively corresponding to the detection signal, the printing material and the air. The introduction of the AI module greatly improves the efficiency of data processing of the detection result.

In one possible embodiment, the arithmetic unit comprises: any one of a comparator, a D-type trigger and an analog-to-digital converter (ADC); or, a combination of the comparator and the analog-to-digital converter ADC; or, a combination of the class D flip-flop and the analog-to-digital converter ADC. In this kind of mode, multiple circuit combination can realize preventing cracking better for can't follow printer and ink horn chip interception and cracking in communicating.

In a fourth aspect, an embodiment of the present application further provides a printer-based anti-cracking method, where the method is used to verify a liquid remaining amount detection unit; the method comprises the following steps: generating a corresponding detection signal according to the verification parameter; acquiring a reference result and a detection result corresponding to the detection signal; detecting the residual quantity of the printing material in the printing material box by a liquid residual quantity detection unit based on an input detection signal and outputting the detected result; and judging whether the liquid allowance detection unit is a cracking circuit or not by comparing the detection result with the reference result.

In one embodiment, the liquid remaining amount detecting unit is configured to detect a remaining amount of the printing material in the printing material cartridge based on an input original heat pulse signal, an original clock signal, and an original voltage threshold signal, and output a detection result; a detection signal including at least one of a target heat pulse signal, a target clock signal, and a target voltage threshold signal; the target heat pulse signal, the target clock signal and the target voltage threshold signal are obtained by modifying the original heat pulse signal, the original clock signal and the original voltage threshold signal respectively.

In one embodiment, the check parameters include at least one of a first check parameter, a second check parameter and a third check parameter; wherein the first calibration parameter is used for modifying the peak value and/or the duty ratio of the original heat pulse signal; a second calibration parameter for modifying a period and/or duty cycle of the original clock signal; and the third verification parameter is used for modifying the voltage value of the original voltage threshold signal.

In one embodiment, acquiring a reference result corresponding to the detection signal includes: and calculating a corresponding reference result according to the heat dissipation relation respectively corresponding to the detection signal, the printing material and the air.

In a fifth aspect, embodiments of the present application further provide a storage medium, where an executable program is stored, and when the storage medium is run on any electronic device, the storage medium causes the electronic device to perform the method according to any one of the above fourth aspects.

The printing device, the chip, the printer-based anti-cracking method and the storage medium in the embodiment of the application generate corresponding detection signals according to the verification parameters, the detection signals are input into the liquid allowance detection unit, whether the liquid allowance detection unit is an original residual liquid level detection circuit in an original ink box is identified according to detection results fed back by the liquid allowance detection unit, and the scheme can effectively identify whether the liquid allowance detection unit installed in the printer is an original ink, so that the anti-cracking capability of the printer and the ink box is improved, the situation that the printer is damaged or the service life of the printer is shortened due to the fact that the cracked non-original residual liquid level detection circuit is installed is avoided, and the printer is better protected.

Drawings

FIG. 1 is a schematic diagram of a residual liquid level detection circuit;

FIG. 2 is a schematic diagram of the arrangement of the heating circuit and the sensor circuit;

FIG. 3 is a schematic diagram of the detection principle of the residual liquid level detection circuit;

FIG. 4 is a schematic flow chart diagram illustrating one embodiment of a printer-based anti-tamper method provided by an embodiment of the present application;

FIG. 5 is a schematic diagram illustrating a schematic diagram of a thermal pulse signal modification in an embodiment of a printer-based anti-tamper method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating a clock signal being modified according to another embodiment of the anti-hacking method based on a printer provided in the embodiment of the present application;

FIG. 7 is a schematic diagram illustrating a clock signal being modified according to another embodiment of the anti-tamper method based on a printer according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram illustrating an embodiment of a printer-based anti-tamper method according to the present disclosure for altering the amplitude of a voltage threshold signal;

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

fig. 10 is a schematic diagram illustrating interaction between a cartridge chip and other structures according to an embodiment of the present disclosure.

Detailed Description

The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.

In the related art, a scheme for detecting the residual liquid level in the ink cartridge of a printer is as follows:

referring to fig. 1, fig. 1 is a schematic diagram of a residual liquid level detection circuit, which may include:

a control circuit (controller) for controlling the current source to supply power to the sensor and for controlling the operation of the heating circuit; the heating circuit is arranged in the ink box and used for generating heat and changing the temperature; a sensor disposed within the ink cartridge for sensing temperature changes at a nearby location to convert temperature at or substantially near the sensed location (e.g., within 10 microns) to a voltage, i.e., to convert the sensed temperature to a voltage signal output; generally, the sensor and the heating circuit are arranged in a one-to-one configuration, and one heating circuit and the matched sensor are arranged at one sensing position. For example, referring to fig. 2, fig. 2 is a schematic layout diagram of a heating circuit and a sensor circuit, and when liquid level detection is performed, one sensor 20(S) is collocated with one heating circuit 10 (H). The residual liquid level detection circuit may comprise n sensors 20 and n heating circuits 10. The granularity or accuracy of the measurement of the residual liquid level depends on the number of sensing positions, and the larger n is, the smaller the detection granularity is, and the higher the accuracy is. For example, if five evenly spaced sensing locations are provided, the residual liquid level measurements are calculated at twenty percent intervals. As another example, if 100 sensing positions are provided, the detection accuracy is one percent of the maximum value of the liquid level, if 20 sensing positions are provided, the detection accuracy is five percent of the maximum value of the liquid level, and so on.

The residual liquid level detection circuit further comprises: a calculation circuit (such as a multiplexer and a comparison trigger) for calculating liquid level information according to the voltage signal output by the sensor; and a feedback circuit (not shown) for feeding the calculated liquid level information back to a module such as a controller (e.g., a chip).

Specifically, referring to fig. 3, the detection principle of the above-mentioned residual liquid level detection circuit is as follows:

the heat pulse signal controls the heating circuit 10 to generate heat, and for example, when the heat pulse is at a high level, the heating circuit heats up, and when the heat pulse signal is at a low level, the heating is stopped.

The sensor 20 senses ambient temperature changes and converts the temperature changes into a changing voltage signal. The output voltage signal and the temperature have a one-to-one correspondence quantitative relationship, that is, there is a quantitative functional relationship between the output voltage and the sensed temperature, for example, the sensed temperature and the output voltage signal have a correspondence relationship: u- α Δ Vbe/Vbe, where u represents voltage, α is a constant, and Vbe represents temperature.

Comparing the voltage obtained in the step (c) with a threshold voltage by using a voltage comparator, outputting a high level when the sensed voltage is greater than or equal to the threshold voltage, and outputting a low level when the sensed voltage is lower than the threshold voltage. The duration of the output high level may be understood as the flip duration, i.e. the duration of the flip from high level to low level.

When the voltage comparator outputs high level, the counter counts the number of the rising edges of the received clock signals according to the periodic clock signals (sampling clock signals) provided by the RTC or the crystal oscillator of the clock chip; the counted number can characterize the duration of time that the sensed voltage is greater than or equal to the voltage threshold or less than the voltage threshold.

When the position sensed by the sensor is in the ink, the output high level time of the voltage comparator is less than that in the air, so that when the ink is in the ink, the number of the counting rising edges of the counter is less than that in the air, the counter sends the counting result to the chip, and the chip knows which position sensor is in the ink/air by comparing the counting result, thereby knowing the ink liquid level. As shown in fig. 3, the temperature response curve with ink is shown as 305, and the temperature response curve without ink is shown as 310, it is obvious that the curve 305 approaches the voltage threshold and is lower than the voltage threshold more quickly, that is, the voltage signal corresponding to the temperature falls below the voltage threshold more quickly when the ink is present, the corresponding count value is smaller, and the duration of the inversion time 315 is shorter; curve 310 more slowly approaches and is below the voltage threshold, i.e., in the absence of ink (air), the temperature corresponding voltage signal decreases relatively more slowly, corresponding to a larger count value and a longer duration of the roll-over time 320. Thus, from the counted values, it is possible to determine whether air or ink is present around the current sensing position, and thus to determine which sensing position the liquid level of the remaining liquid is in the vicinity.

The scheme can effectively detect the residual liquid level, but the cracking behavior cannot be resisted, for example, a user uses a non-original ink box to replace an original ink box, the non-original ink box uses a cracked residual liquid level detection circuit, the cracking circuit can perform signal interaction with a printer according to an original mechanism, corresponding liquid level detection is not actually performed, or the cracked residual liquid level detection circuit and the original printer have mismatching conditions, so that the ink amount cannot be accurately pre-warned, and the printer is damaged or the service life of the printer is shortened.

In view of this, the embodiments of the present application provide a printing apparatus, a chip, a printer-based anti-cracking method, and a storage medium.

For the sake of understanding, the anti-cracking method provided in the embodiments of the present application will be described.

Referring to fig. 4, the method for preventing cracking based on a printer according to the embodiment of the present application may include the following steps:

401, generating a corresponding detection signal according to the verification parameter;

402, acquiring a reference result and a detection result corresponding to the detection signal;

wherein the liquid remaining amount detecting unit detects and outputs the remaining amount of the printing material in the printing material cartridge based on the input detection signal.

And 403, judging whether the target object is original or not by comparing the detection result with the reference result.

The target object comprises at least one of a liquid residual detection unit, an MCU chip and an MPU chip, namely the cracking prevention method provided by the application can detect whether the liquid residual detection unit is original or not, can also detect whether ink is original ink or not, and whether the MCU chip and the MPU chip are original chips or not.

As can be understood from the above description, the liquid remaining amount detection unit (i.e., the remaining liquid level detection circuit) is configured to detect the remaining amount of the printing material in the printing material cartridge based on an input signal or the like and output a detection result. The input signal comprises a heat pulse signal (determining heating time length), a clock signal (counting turnover time length) and a voltage threshold (determining turnover time point), under the condition that the liquid residual quantity detection unit to be verified is an original circuit, if any one of the input signals is changed, an obtained detection result is changed accordingly, and a definite one-to-one corresponding relation exists between the changed detection signal and an output detection result, namely a quantitative function relation exists between a verification parameter and the output detection result, so that whether the liquid residual quantity detection unit is original or not can be identified by verifying whether a known corresponding relation exists between the detection result output by the liquid residual quantity detection unit and the verification parameter. Specifically, the detection result output by the original residual liquid level detection circuit is used as a reference result, and the detection result output by the liquid residual amount detection unit is compared with the reference result, so that whether the liquid residual amount detection unit is original or not is identified.

Specifically, the detection signal includes any one of a target heat pulse signal, a target clock signal, and a target voltage threshold signal; the target heat pulse signal, the target clock signal and the target voltage threshold signal are obtained by modifying the original heat pulse signal, the original clock signal and the original voltage threshold signal respectively.

The modification of the detection signal can be realized by setting a verification parameter, wherein the verification parameter is used for determining the modification amplitude of signals such as a heat pulse signal, a clock signal, a voltage threshold value and the like. Correspondingly, the check parameters include any one of the first check parameters, the second check parameters and the third check parameters.

Wherein the first verification parameter is used to modify a peak value and/or a first duty ratio of the original heat pulse signal, for example, modify the peak value of the heat pulse signal, so that the signal amplitude at a high level is higher, and thus the larger the heating amplitude is, the higher the temperature rises in unit time is; alternatively, the duty ratio (first duty ratio) of the heat pulse signal is modified, that is, the high level time period of the heat pulse signal is modified, and the heating time period is extended or reduced. For example, the duty ratio of the modified heat pulse signal agreed in the first verification parameter is 50%. To prevent aliasing, the duty cycle of the heat pulse signal is referred to as a first duty cycle, and the duty cycle of the original clock signal is referred to as a second duty cycle.

And a second calibration parameter for modifying the period and/or the second duty cycle of the original clock signal, for example, modifying the period of the clock signal, or modifying the proportion of the high level of the clock signal to the duration of one pulse period. The modification period is also the frequency of the clock signal. For example, the modified clock signal has a period of 1/12us (frequency of 12M) and a duty ratio (second duty ratio) of 50% or 75% as agreed in the second calibration parameter.

And the third verification parameter is used for modifying the voltage value of the original voltage threshold signal. For example, the magnitude of the voltage value corresponding to the modified voltage threshold signal agreed in the third verification parameter is increased by 30% compared with the original voltage threshold signal, and so on.

Several specific examples are listed below:

in one example, only the heat pulse signal is used as a modification target, and the heat pulse signal is changed, while the clock signal for counting (i.e., the original clock signal) is not changed, and the voltage threshold signal is also not changed. As such, the verification parameter may be a parameter value that controls at least one of a peak value and a duty ratio of the heat pulse signal, for example, the verification parameter may be a high level duration (duty ratio) of the heat pulse signal, or may be a peak value of the heat pulse signal; or it may also be a combination of high duration and peak, i.e. both duty cycle and peak are modified. According to the checking parameters, the heat pulse signal with corresponding peak value and/or duty ratio can be generated as the detection signal. Wherein, modifying the duty cycle may include modifying the falling edge, i.e., modifying the time corresponding to the falling edge.

The duty ratio of the heat pulse is modified, which is equivalent to changing the working high-level duration of the heating circuit, the peak value of the heat pulse signal is changed, which is equivalent to changing the heating intensity, the corresponding sensing voltage is changed, the number of rising edges of the clock signal is changed, and the liquid level is calculated according to the number of the rising edges. In some embodiments, the number of rising edges of the clock signal may also be used for cryptographic authentication. The heat Pulse signal may be obtained based on Pulse Width Modulation (PWM).

For example, referring to fig. 5, when the duty ratio of the heating clock signal is increased, that is, the heating time of the heating circuit is prolonged, the falling edge of the heat pulse signal is shifted to the right; and the peak value of the thermal pulse signal is adjusted to be high, the modified thermal pulse signal is shown as a dotted line (trapezoid) in fig. 5, correspondingly, under the condition of modifying the thermal pulse signal, the corresponding sensing voltage signal also changes, and compared with the original voltage signal (a black solid curve corresponding to the sensing voltage), the response curves corresponding to the modified sensing voltage signal are respectively shown as dotted line curves in fig. 5 under the conditions of ink existence and ink nonexistence.

Specifically, the heat pulse signal may be generated as follows:

the first method is as follows: adopting LabVIEW programming;

the second method comprises the following steps: firstly, packaging a pulse generation program into Subvi of LabVIEW, and then calling by the LabVIEW;

the third method comprises the following steps: firstly, programming a pulse generation program into a dynamic link library by using Visual C + +6.0, and then calling the dynamic link library by LabVIEW;

the method is as follows: programming under DOS by adopting Turbo C;

the fifth mode is as follows: the pulse is generated by modifying its interrupt service routine using a timer/counter.

When the voltage threshold signal (i.e., the threshold voltage shown in fig. 5) 360 is kept constant and the duty ratio of the clock signal is not changed, the number of rising edges of the clock signal increases when ink is present at the sensing position, and the corresponding count results in the inversion time 515, and when ink is not present at the sensing position (e.g., air is present around the sensing position), the number of rising edges of the clock signal also increases, and the corresponding count results in the inversion time 520. The turn-over times 515 and 520 obtained by the original residual liquid level detection circuit are used as reference results.

Thus, for example, the verification parameters of the heat pulse signal and the inversion times 515 and 520 obtained in correspondence thereto may be recorded, and when the same detection signal is output again, if the inversion time in the detection result fed back is identical to the inversion times 515 and 520 shown in fig. 5 or is within the error tolerance, the verification object (liquid remaining amount detection means) is considered as the original circuit. If the verification object is inconsistent or exceeds the error allowable range, the verification object is considered to be a cracked circuit which is not originally installed.

According to the scheme, the working high-level duration (checking parameter) of the heating element is simply controlled, the heat pulse signal (detection signal) is changed, the detection results (the number of rising edges) corresponding to the checking parameter and the detection signal are generated, the detection results are checked by a printer (namely, a printing device) or an MPU chip and the like, and the anti-cracking effect is achieved.

In another example, the period and duty cycle of the clock signal are changed, the thermal pulse signal is unchanged, the voltage threshold signal is also unchanged, statistics on the number of rising edges of the clock signal are changed, the liquid level condition is calculated according to the number of rising edges, and anti-tamper authentication is performed. Specifically, referring to fig. 6, the modified object is a clock signal, the verification parameter is a period and a duty ratio of the clock signal, the modified period is set to be extended to double the original period, the duty ratio is 50%, the obtained detection signal includes the clock signal with the duty ratio of 50% and the extended period, and the detection signal further includes an original thermal pulse signal and an original voltage threshold signal which are kept unchanged. A heater circuit within the cartridge emits heat and a temperature sensor (i.e., sensor 20) associated with the heater circuit senses the temperature and outputs a corresponding sensed voltage signal. Counting the number of rising edges of the clock signal, wherein when ink exists around the sensing position where the sensor is located, the number of the rising edges is reduced to only 2, and obtaining the turning time 615; similarly, when air is present around the sensor, the number of rising edges is also reduced compared to the previous example, resulting in a roll-over time 620. Therefore, when the residual liquid level detection circuit is an original circuit, the calibration parameters for adjusting the clock signal have a definite corresponding relationship with the obtained flip times 615 and 620, and if the circuit is replaced, the corresponding relationship is changed, that is, the cracked non-original circuit generally makes the calibration parameters and the output detection result have no corresponding relationship consistent with the original circuit. When the same detection signal as in this example is input again (the clock signal period is extended to double, the duty ratio is 50%), it is possible to discriminate whether the liquid remaining amount detecting unit is genuine or not, depending on whether the count result fed back by the liquid remaining amount detecting unit, that is, whether the inversion time fed back by the liquid remaining amount detecting unit coincides with the inversion times 615 and 620 (reference results) obtained in this example or is within the error allowance range.

According to the scheme, the period and the duty ratio (checking parameters) of the clock signal are simply controlled, the clock signal (detection signal) is changed, detection results (the number of rising edges) corresponding to the checking parameters and the detection signal are generated, and the anti-cracking effect is achieved through comparison between the detection results and the reference results.

In yet another example, the duty cycle of the clock signal may be modified to 75%, the cycle may be extended to double the original cycle, a heating circuit within the cartridge may emit heat, and a temperature sensor associated with the heating circuit may sense the temperature and output a corresponding sensed voltage signal. For example, as shown in fig. 7, the number of rising edges of the clock signal in the time interval from the time of stopping heating to the time of the sensed voltage signal decreasing to the voltage threshold value in the case of the presence and absence of ink is counted, at this time, when ink is present around the sensor, the number of rising edges decreases accordingly, and similarly, when the sensor is in the air, the number of rising edges also decreases accordingly.

In another example, the threshold voltage is changed, the thermal pulse signal and the clock signal are kept unchanged, the turnover time is changed, the number of rising edges of the clock signal is counted respectively, and the liquid level condition and the anti-tamper authentication are calculated according to the number of the rising edges. Referring to fig. 8, the threshold voltage is set to be increased, as shown by the solid line marked with the threshold voltage 860 in fig. 8, that is, the voltage threshold signal after the increase is obtained, the corresponding sensing voltage signal is unchanged, the thermal pulse signal is unchanged, the period and duty ratio of the clock signal are also unchanged, the inversion time is shortened, the corresponding inversion time 815 is obtained in the case of ink being present, and the obtained inversion time 820, the inversion times 815 and 820 are shortened compared with the original inversion times 315 and 320 in the case of no ink being present.

It should be noted that, due to the characteristics of the ink, in the case of inputting the same detection signal, the difference of the ink may also result in outputting different detection results, that is, whether the ink is the original ink can also affect the detection result, and when the ink is not the original ink, the output detection result may also be changed compared with the detection result corresponding to the original ink.

According to the exemplary scheme, the voltage threshold (verification parameter) is controlled, the threshold voltage signal (detection signal) is changed, the detection results (the number of rising edges) corresponding to the verification parameter and the detection signal are generated, and the anti-cracking effect is achieved.

The anti-cracking method can be realized based on different hardware devices.

Correspondingly, the embodiment of the application also provides a printing device, which is used for implementing the anti-cracking method so as to verify the liquid residual quantity detection unit.

Specifically, the printing apparatus includes a printer control unit for generating a verification parameter. And the liquid allowance detection unit is used for detecting the allowance of the printing material in the printing material box based on the input detection signal, outputting a detection result to the printer control unit, and generating the detection signal according to the verification parameter. And then, the printer control unit acquires a reference result corresponding to the detection signal, and identifies whether the liquid residual detection unit is a cracking circuit or not by comparing the detection result with the reference result.

In one example, the printing device further includes a cartridge chip. In this exemplary embodiment, the verification parameter is generated by the printer, the detection signal is generated by the cartridge chip, and the verification is performed by the print control unit. Referring to fig. 9, after the printer control unit generates the calibration parameter, the calibration parameter is transmitted to the ink cartridge chip, the ink cartridge chip generates a corresponding detection signal according to the calibration parameter to drive the liquid remaining amount detection unit, and the liquid remaining amount detection unit obtains a corresponding detection result according to the input detection signal and feeds the detection result back to the print control unit. And the printing control unit is used for reading the reference result in real time according to the pre-stored reference result or in real time in the appointed storage path, and comparing the reference result with the detection result fed back by the liquid allowance detection unit to realize the verification of the liquid allowance detection unit.

In the example scheme corresponding to fig. 9, the output detection result and the verification parameter have a corresponding relationship, so that verification that the liquid remaining amount detection unit is original or not can be realized by verifying the detection result and the verification parameter, and cracking prevention can be realized.

In another example, the printing device further includes a cartridge chip. In the example scheme, the verification parameters and the detection signals are generated by the printer control unit, the comparison verification is also completed by the printer control unit, and the ink box chip is used for feeding back the detection result. Referring to fig. 10, the printer control unit generates a calibration parameter and generates a corresponding detection signal according to the calibration parameter, and transmits the detection signal to the cartridge chip; and the ink box chip acquires a detection result corresponding to the detection signal according to the detection signal and transmits the detection result to the printer control unit. And the printer control unit verifies the detection result according to the verification parameters.

The exemplary scheme corresponding to fig. 10 can achieve the effect of preventing cracking, and meanwhile, can avoid intercepting cracking verification parameters from communication between the printer and the ink cartridge chip, so that the security is better, and the cracking prevention barrier is higher.

The MPU chip or the MCU chip provided in the embodiments of the present application is explained below.

The print control Unit may be a Micro Processor Unit (MPU), that is, an MPU chip provided in the embodiment of the present application may be used as the print control Unit. Specifically, the MPU chip is used for generating a verification parameter and converting the verification parameter into a related detection signal, and the MPU comprises an arithmetic unit which can simulate the ink residual quantity based on the detection signal to calculate a corresponding detection result for comparing and verifying the safety of residual quantity detection. The conversion of the calibration parameter into a related detection signal includes changing at least one of a thermal pulse signal, a clock signal, or a voltage threshold signal according to a change of the calibration parameter to obtain a detection signal. According to the scheme, the anti-cracking is realized through various circuit combinations, so that the key information of cracking cannot be intercepted from the communication between the printer and the ink box chip, and the safety is improved.

The operation unit is used for calculating a corresponding detection result based on the detection signal, and can be any one or any combination of a comparator, a D-type trigger and an analog-to-digital converter (ADC), such as the comparator, the D-type trigger or the ADC; alternatively, a combination of a comparator and an ADC, or a combination of a class D flip-flop and an ADC is also possible.

Specifically, as an embodiment, the operation unit may include an Analog Input (AI) module, and calculate a heating and heat dissipation curve according to a heat dissipation relationship between a printing material (e.g., ink) and air and a verification parameter (or a detection signal), so as to calculate a corresponding detection result, and use the detection result as a reference result. The introduction of the AI module greatly improves the efficiency of data processing of the detection result.

In still further embodiments, the reference result may also be determined as follows:

generating corresponding multiple groups of detection signals according to multiple groups of different checking parameters, then carrying out multiple groups of tests based on an original residual liquid level detection circuit, respectively changing any one of a heat pulse signal, a clock signal and a voltage threshold in the detection signals, then taking multiple groups of detection results output by the original residual liquid level detection circuit as reference results, and recording the checking parameters or input detection signals and corresponding reference results one by one to clarify the corresponding relation between input and output.

In this way, during actual verification, one of the multiple groups of inputs is selected as a detection signal, if the detection result fed back by the residual liquid level detection circuit and the input detection signal conform to a predetermined corresponding relationship, that is, the output detection result is consistent with the reference result or the error is small, the residual liquid level detection circuit is considered as an original package, and if the feedback detection result and the input detection signal do not conform to the predetermined corresponding relationship, that is, the difference between the output detection result and the reference result is obvious, the residual liquid level detection circuit is judged as a non-original-package cracking circuit.

The anti-cracking method can also be realized based on a Micro Controller Unit (MCU) chip. The MCU chip can be installed on the printing material box, and the verification parameters are converted into corresponding detection signals, and the MCU chip comprises an arithmetic unit, and corresponding detection results can be calculated based on detection signal simulation ink allowance.

It should be noted that, for converting the calibration parameters into corresponding detection signals, the following circuits may be respectively used for implementation:

generating a heat pulse signal based on the frequency divider;

generating a Clock signal based on a Real-Time Clock (RTC) or a crystal oscillator;

based on the latch-comparator circuit, an upper threshold voltage limit is set and a corresponding voltage threshold signal is output.

The number of the printer control unit, the MPU chip, or the MCU chip (processor) may be one or more, and optionally, a memory may be further provided, and the processor and the memory may be connected by a bus or other means. The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the devices in the embodiments of the present application. The processor executes various functional applications and data processing by running non-transitory software programs, instructions and modules stored in the memory, that is, implements the tamper-proof method in any of the above-described method embodiments. The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; and necessary data, etc. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device.

The embodiment of the application also provides a storage medium, wherein the storage medium stores an executable program, and when the executable program runs on the electronic equipment, the electronic equipment is enabled to execute the printer-based anti-cracking method in any embodiment.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions described in accordance with the present application are generated, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk), among others.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. An MPU chip for mounting in a printing apparatus;

the MPU chip is used for generating a verification parameter and generating a detection signal according to the verification parameter, and the detection signal is input to a liquid allowance detection unit in the printing material box; the liquid residual amount detection unit is used for detecting the residual amount of the printing material in the printing material box according to the detection signal and outputting a detection result to the MPU chip;

the MPU chip comprises an arithmetic unit which is used for calculating a corresponding reference result according to the detection signal and identifying the printing material box by comparing the detection result output by the liquid residual quantity detection unit with the reference result.

2. The MPU chip of claim 1, wherein the detection signal is at least one of a target heat pulse signal, a target clock signal, a target voltage threshold signal.

3. The MPU chip according to claim 1, comprising: at least one circuit of frequency divider, clock chip RTC, crystal oscillator, pulse width modulation and latch-comparator circuit.

4. An MPU chip according to claim 3, characterized in that: the MPU chip includes:

the frequency divider is used for generating a target heat pulse signal according to the checking parameter;

the clock chip RTC or the crystal oscillator is used for generating a target clock signal according to the verification parameter;

the latch-comparator circuit is used for generating a target voltage threshold signal according to the verification parameter;

and the pulse width modulation circuit is used for generating a target heat pulse signal according to the verification parameter.

5. An MPU chip according to claim 3, wherein the latch-comparator circuit is further adapted to set an upper limit of a target voltage threshold.

6. An MPU chip according to claim 1, wherein said arithmetic unit comprises:

any one of a comparator, a D-type trigger and an analog-to-digital converter (ADC);

or the like, or, alternatively,

a combination of a comparator and an analog-to-digital converter (ADC);

or the like, or, alternatively,

a combination of a class D flip-flop and an analog to digital converter ADC.

7. The MPU chip according to claim 1, wherein the arithmetic unit comprises an AI module;

and the AI module is used for calculating a corresponding reference result according to the heat dissipation relation respectively corresponding to the detection signal, the printing material and the air.

8. The MCU chip is characterized in that the MCU chip is used for being installed on a printing material box;

the MCU chip generates a detection signal according to the verification parameter generated by the printer control unit,

the MCU chip inputs the detection signal to a liquid allowance detection unit in the printing material box, and drives the liquid allowance detection unit to detect the allowance of the printing material in the printing material box to obtain a detection result;

and the MCU chip inputs the detection result into the printer control unit, so that the printer control unit verifies the detection result according to the verification parameter.

9. The MCU chip of claim 8, wherein the detection signal is at least one of a target heat pulse signal, a target clock signal, and a target voltage threshold signal.

10. The MCU chip of claim 8, wherein the MCU chip comprises:

at least one circuit of frequency divider, clock chip RTC, crystal oscillator, pulse width modulation and latch-comparator circuit.

11. MCU chip according to claim 10,

the frequency divider is used for generating a target heat pulse signal according to the checking parameter;

the clock chip RTC or the crystal oscillator is used for generating a target clock signal according to the verification parameter;

the latch-comparator circuit is used for generating a target voltage threshold signal according to the verification parameter;

and the pulse width modulation circuit is used for generating a target heat pulse signal according to the verification parameter.

12. The MCU chip of claim 10, wherein the latch-comparator circuit is further configured to set an upper limit of a target voltage threshold.

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