A power management circuit for cloud printing with power-off reminder and a printer

Abstract

The utility model discloses a kind of cloud printing power management circuit and printer of power-off reminding, power-off reminding cloud printing power management circuit includes power input module, battery module, power switching module, control module, when external power supply is normal, control module controls first MOS tube Q1 conduction, second MOS tube Q2 is turned off, by system operating voltage power supply, and charge for battery module;When external power supply is disconnected, control second MOS tube Q2 conduction, switch for by battery module power supply;And send printer power-off information to server, after information sending is completed, control first MOS tube Q1 is closed, stop battery module power supply.The utility model discloses power-off reminding cloud printing power management circuit, solve the data loss problem when cloud printing equipment is unexpectedly powered off, ensure that power-off key information can be reliably uploaded to server, while maximum limit reduce the energy loss of standby battery, prolong battery life.

Description

Technical Field

[0001] This utility model relates to the field of printer circuit technology, and in particular to a cloud printing power management circuit and printer with power failure reminder. Background Technology

[0002] With the rapid development of IoT technology, cloud printing devices, as important terminals in smart offices and industrial IoT, have become crucial in terms of stability and manageability. These devices need to report their status information, such as print job progress, consumable status, and fault information, to cloud servers in real time so that manufacturers or users can remotely monitor and manage them.

[0003] In real-world applications, cloud printing devices may experience operational interruptions due to unexpected power outages. If the device stops working immediately after a power outage, it cannot send information such as the final power outage status and unfinished tasks to the server, resulting in data loss and affecting the accuracy and reliability of backend management. Therefore, there is an urgent need for a power management solution that allows the device to maintain brief operation after the external power supply is disconnected, completing the reporting of critical data, before entering a complete power-off state.

[0004] Traditional backup power solutions typically use diode OR logic circuits to achieve primary / backup power switching. While this approach is simple in structure, it has the following inherent drawbacks: Large forward voltage drop: The forward voltage drop of a diode (typically 0.3V-0.7V) can lead to energy waste, especially when powered by a battery. The voltage drop can reduce the effective operating time of the device and may affect the normal operation of low-voltage circuits.

[0005] Limited functionality: It lacks intelligent control, cannot implement a precise power management strategy of "power off after reporting", and cannot meet the specific needs of cloud devices for data reporting.

[0006] Therefore, there is an urgent need in this field for a low-power power management circuit with intelligent control capabilities to solve the problem of reliable data reporting by cloud printing devices in the event of an unexpected power outage. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a cloud printing power management circuit and printer with power outage reminder, wherein the cloud printing power management circuit with power outage reminder includes: The power input module is used to connect an external power source and convert it to the system operating voltage; A battery module, connected to the power input module, is used to provide backup power when the external power supply is disconnected; The power switching module includes a first MOSFET Q1 and a second MOSFET Q2, which form a back-to-back structure. The system operating voltage output terminal of the power input module is connected to the battery module in sequence through the second MOSFET Q2 and the first MOSFET Q1. The control module is connected to the system operating voltage output terminal of the power input module, the first MOSFET Q1, and the second MOSFET Q2, respectively, and samples the system operating voltage in real time. The control module communicates with an external server. When the printer's external power supply is normal, the control module controls the first MOSFET Q1 to turn on and the second MOSFET Q2 to turn off, so that the system working voltage supplies power and charges the battery module. When the printer's external power supply is disconnected, the second MOSFET Q2 is turned on, switching to power supply from the battery module; and a printer power failure message is sent to the server. After the message is sent, the first MOSFET Q1 is turned off, stopping the battery module from supplying power.

[0008] Preferably, the power switching module further includes a diode D7, whose anode is connected to the system operating voltage and whose cathode is connected to the second MOSFET Q2 and the control module.

[0009] Preferably, the power switching module further includes transistor Q3, transistor Q4, resistors R6, R7, R8, R9, R10, R11, R12, R13 and capacitor C7. The drains of the first MOSFET Q1 and the second MOSFET Q2 are connected; The system operating voltage output terminal of the power input module is connected to one end of resistor R9, the power supply terminal of the control module, the source of the second MOSFET Q2, and one end of resistor R8; resistor R9 is grounded through resistor R13, and the connection node of resistor R9 and resistor R13 is connected to the control module through resistor R11. The gate of the second MOSFET Q2 is connected to the collector of the transistor Q4. The connection node between the gate of the second MOSFET Q2 and the collector of the transistor Q4 is connected to the other end of the resistor R8. The emitter of the transistor Q4 is grounded, and the base of the transistor Q4 is connected to the control module. The connection node between the drains of the first MOSFET Q1 and the second MOSFET Q2 is connected to one end of capacitor C7 and one end of resistor R7, respectively; the other end of capacitor C7 is grounded; the other end of resistor R7 is grounded through resistor R12; and the connection node between resistor R7 and resistor R12 is connected to the control module through resistor R10. The gate of the first MOSFET Q1 is connected to one end of resistor R6 and the collector of transistor Q3. The emitter of transistor Q3 is grounded, and the base of transistor Q3 is connected to the control module. The other end of resistor R6 and the source of the first MOSFET Q1 are both connected to the battery module.

[0010] Preferably, the power input module outputs the system operating voltage through the first step-down module and charges the battery module through the second step-down module; The system operating voltage supplies power to the control module through the third step-down module.

[0011] Preferably, the first step-down module includes a step-down transformer U12, a fuse resistor FB3, a fifth MOSFET Q5, a transistor Q6, a transistor Q7, capacitors C38, C39, C40, C42, C43, C44, and CP4, a diode D8, a resistor R66, an inductor CK1, resistors R67, R68, R69, and R70, wherein: The power input module is connected to one end of fuse resistor FB3. The other end of fuse resistor FB3 is connected to one end of capacitor C39, one end of capacitor C40, one end of resistor R66, and the voltage input pin of buck converter U12. The other ends of capacitors C39 and C40 are grounded. The other end of resistor R66 is connected to the enable pin of buck converter U12. The switching node pin of buck converter U12 is connected to one end of inductor CK1 and one end of capacitor C38. The other end of capacitor C38 is connected to the bootstrap pin of buck converter U12. The feedback pin of buck converter U12 is connected to one end of resistor R70, one end of resistor R67, and one end of capacitor C42. The other ends of resistor R67, capacitor C42, and inductor CK1 are connected to the other end of the fuse resistor FB3. All terminals are connected to one end of capacitor C43, one end of capacitor C44, one end of capacitor CP4, and the anode of diode D8; the cathode of diode D8 is connected to the source of the fifth MOSFET Q5, one end of resistor R68, and one end of resistor R59; the other end of resistor R68 is connected to the base of transistor Q6 and the collector of transistor Q7; the other end of resistor R69 is connected to the gate of the fifth MOSFET Q5 and the collector of transistor Q6; the drain of the fifth MOSFET Q5 is connected to the power switching module; the emitters of transistors Q6 and Q7 are both grounded; the base of transistor Q7 is connected to the control module; the other ends of resistor R70, capacitor C43, capacitor C44, and capacitor CP4 are all grounded.

[0012] Preferably, the second step-down module includes a voltage regulator U1, a diode D1, capacitors C1, C2, C3, C4, C5, and C6, resistors R1, R2, R3, R4, and R5, LED1, and a charging management module U2, wherein: Voltage regulator U1 is connected to the power input module via diode D1, and the connection point between voltage regulator U1 and diode D1 is grounded through capacitor C2. The output voltage terminal of voltage regulator U1 is connected to the enable terminal, and the connection point is grounded through capacitor C1, resistor R1, capacitor C3, and capacitor C4 respectively. The output voltage terminal of voltage regulator U1 is also connected to one end of resistor R2, one end of LED1, and the power input terminal of charging management module U2. The other end of resistor R2 is grounded through capacitor C6. The other end of LED1 is connected to the status indicator terminal of charging management module U2 through resistor R3. The status indicator terminal of charging management module U2 is also connected to the control module through resistor R4. The charging status indicator of the charging management module U2 is connected to the other end of LED1; The charging current setting terminal of the charging management module U2 is connected to one end of the resistor R5; the battery connection terminal of the charging management module U2 is connected to one end of the capacitor C5 and the battery module; the other end of the resistor R5 and the other end of the capacitor C5 are both grounded.

[0013] Preferably, the third step-down module includes a voltage regulator U18, a capacitor C8, and a capacitor C9; The system operating voltage is connected to the input voltage terminal of the third step-down module and one end of capacitor C8; the output voltage terminal and enable terminal of the third step-down module are connected, and its connection node is connected to one end of capacitor C9 and supplies power to the control module. The other end of capacitor C8 and the other end of capacitor C9 are both grounded.

[0014] This utility model also provides a printer that uses the cloud printing power management circuit with power failure reminder as described above.

[0015] The power management circuit for cloud printing with power outage reminder provided by this utility model intelligently, efficiently and reliably solves the problem of data loss in cloud printing devices during unexpected power outages. Through the intelligent control process of "detection-switching-reporting-shutdown", it ensures that critical information about power outages can be reliably uploaded to the server, while minimizing the energy loss of backup batteries and extending battery life. Attached Figure Description

[0016] Figure 1 A block diagram of a cloud printing power management circuit with power failure reminder provided for an embodiment of the utility model; Figure 2 This is the circuit diagram of the power switching module; Figure 3 This is the circuit diagram of the first step-down module; Figure 4 This is the circuit diagram for the second step-down module; Figure 5 This is the circuit diagram for the battery module; Figure 6This is the circuit diagram for the third step-down module; Figure 7 This is the circuit diagram for the control module; The components are: 10, power input module; 20, battery module; 30, power switching module; 40, control module; 51, first step-down module; 52, second step-down module; 53, third step-down module. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments can be obtained commercially.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] This utility model embodiment provides a cloud printing power management circuit and printer with power outage reminder, wherein the cloud printing power management circuit with power outage reminder, as follows: Figure 1 As shown, it includes: The power input module 10 is used to connect an external power source (VIN) and convert it to the system operating voltage (SYS) through the first step-down circuit 51. - +5V); The battery module 20 is connected to the power input module 10 and is used to provide backup power when the external power supply is disconnected. The battery module 20 uses rechargeable batteries, including but not limited to lithium batteries and lead-acid batteries. Preferably, the battery module 20 is an onboard button-type lithium battery. The power switching module 30 includes a first MOSFET Q1 and a second MOSFET Q2. The first MOSFET Q1 and the second MOSFET Q2 form a back-to-back structure with their drains connected. The system operating voltage output terminal of the power input module 10 is connected to the battery module 20 in sequence through the second MOSFET Q2 and the first MOSFET Q1. Control module 40 is a control MCU unit, which is connected to the system operating voltage output terminal of power input module 10, the first MOSFET Q1, and the second MOSFET Q2, respectively, and samples the system operating voltage in real time. Control module 40 is equipped with a 4G module (EC800K) for communication with an external server. When the printer's external power supply is normal (i.e., when VIN is connected), the control module 40 controls the first MOSFET Q1 to turn on and the second MOSFET Q2 to turn off, so that the system working voltage supplies power and charges the battery module 20. When the printer's external power supply is disconnected (i.e., when VIN is disconnected), the second MOSFET Q2 is turned on, switching to power supply from the battery module 20; and a printer power failure message is sent to the server. After the message is sent, the first MOSFET Q1 is turned off, stopping the battery module 20 from supplying power.

[0021] The cloud printing power management circuit with power outage reminder provided in this embodiment of the utility model samples the system voltage in real time through the control module and precisely controls the conduction and shutdown of two back-to-back connected MOS transistors, realizing safe and fast switching between external power supply and battery power supply, ensuring that the circuit power supply is not interrupted at the moment of power failure, and providing a stable energy foundation for subsequent data reporting. After detecting a power outage and switching to battery power, the control module prioritizes communication tasks, sending power outage information to the cloud server. This process ensures that critical status data is not lost due to sudden power outages, greatly improving the reliability of cloud printing device management and the accuracy of backend data. After the information is sent, the control module actively cuts off the battery power supply circuit, avoiding the waste of battery power being slowly depleted by the idle circuit. This "task completion and power off" strategy maximizes the conservation of backup power, extends battery life and standby time, and reduces maintenance frequency. At the same time, the back-to-back MOSFET structure effectively prevents battery voltage from flowing back into the power input module when the external power supply is normal (Q2 is off), protecting the upstream circuitry and avoiding the ineffective consumption of battery energy.

[0022] The cloud printing power management circuit with power outage reminder provided in this embodiment of the utility model intelligently, efficiently and reliably solves the problem of data loss of cloud printing devices when there is an unexpected power outage; through the intelligent control process of "detection-switching-reporting-shutdown", it ensures that key information about power outages can be reliably uploaded to the server, while minimizing the energy loss of the backup battery and extending the battery life.

[0023] In a specific implementation, the power switching module 30 also includes a diode D7, whose anode is connected to the system operating voltage and whose cathode is connected to the second MOSFET Q2 and the control module 40. In this embodiment, the addition of diode D7, with its cathode connected to subsequent circuitry, forms a simple reverse cutoff and voltage regulation buffer, further ensuring that current does not flow backward from the battery or subsequent circuitry into the power input module, thus enhancing circuit isolation.

[0024] In specific implementation, such as Figures 2-7 As shown, the power switching module 30 also includes transistor Q3, transistor Q4, resistors R6, R7, R8, R9, R10, R11, R12, R13 and capacitor C7. The drains of the first MOSFET Q1 and the second MOSFET Q2 are connected; The system operating voltage output terminal of the power input module 10 is connected to one end of resistor R9, the power supply terminal of the control module 40, the source of the second MOS transistor Q2, and one end of resistor R8; resistor R9 is grounded through resistor R13, and the connection node of resistor R9 and resistor R13 is connected to the BAT_VCC_AD pin of the control module 40 through resistor R11. The gate of the second MOSFET Q2 is connected to the collector of the transistor Q4. The connection node between the gate of the second MOSFET Q2 and the collector of the transistor Q4 is connected to the other end of the resistor R8. The emitter of the transistor Q4 is grounded, and the base of the transistor Q4 is connected to the BAT_PWR_MOS pin of the control module 40. The connection point between the drains of the first MOSFET Q1 and the second MOSFET Q2 is connected to one end of capacitor C7 and one end of resistor R7, respectively; the other end of capacitor C7 is grounded; the other end of resistor R7 is grounded through resistor R12, and the connection point between resistor R7 and resistor R12 is connected to the BAT_PWR_AD pin of control module 40 through resistor R10; the BAT_PWR_AD pin is used to detect whether the battery voltage is normal and is only reserved. The gate of the first MOSFET Q1 is connected to one end of resistor R6 and the collector of transistor Q3. The emitter of transistor Q3 is grounded, and the base of transistor Q3 is connected to the BAT_PWR_ON pin of control module 40. The other end of resistor R6 and the source of the first MOSFET Q1 are both connected to battery module 20.

[0025] In this embodiment, the low-voltage, low-current logic signal output by the control module is converted into a suitable level and current that can effectively and quickly drive the gate of the MOSFET, ensuring that the MOSFET can reliably turn on and off. Through a resistor divider network (such as R9 / R13 and R7 / R12), the system voltage and battery voltage are sampled proportionally and fed back to the ADC (analog-to-digital converter) pin of the control module. This allows the control module to accurately monitor the voltage status of the two power supplies in real time, providing accurate data for intelligent switching decisions. This is the foundation for realizing "intelligent control". Components such as capacitor C7 play a role in filtering and debouncing, which can suppress the influence of voltage fluctuations and spike interference on the sampling signal and control signal, and improve the working stability of the circuit in complex electromagnetic environments.

[0026] Further, the first step-down module 51 includes a step-down transformer U12, a fuse resistor FB3, a fifth MOSFET Q5, a transistor Q6, a transistor Q7, capacitors C38, C39, C40, C42, C43, C44, and CP4, a diode D8, a resistor R66, an inductor CK1, resistors R67, R68, R69, and R70, wherein: The power input module 10 is connected to one end of the fuse resistor FB3. The other end of the fuse resistor FB3 is connected to one end of capacitor C39, one end of capacitor C40, one end of resistor R66, and the voltage input pin VIN of the step-down transformer U12. The other ends of capacitors C39 and C40 are grounded. The other end of resistor R66 is connected to the enable pin EN of the step-down transformer U12. The switching node pin SW of the step-down transformer U12 is connected to one end of inductor CK1 and one end of capacitor C38. The other end of capacitor C38 is connected to the bootstrap pin BS of the step-down transformer U12. The feedback pin FB of the step-down transformer U12 is connected to one end of resistor R70, one end of resistor R67, and one end of capacitor C42. The other ends of resistor R67, capacitor C42, and inductor CK1 are all connected to one end of capacitor C43. One end of capacitor C44, one end of capacitor CP4, and the anode of diode D8 are connected; the cathode of diode D8 is connected to the source of the fifth MOSFET Q5, one end of resistor R68, and one end of resistor R59, respectively; the other end of resistor R68 is connected to the base of transistor Q6 and the collector of transistor Q7; the other end of resistor R69 is connected to the gate of the fifth MOSFET Q5 and the collector of transistor Q6; the drain of the fifth MOSFET Q5 is connected to the source of the second MOSFET Q2 of the power switching module 30; the emitters of transistors Q6 and Q7 are both grounded; the base of transistor Q7 is connected to the BAT_PWR_MOS pin of the control module 40; the other ends of resistor R70, capacitor C43, capacitor C44, and capacitor CP4 are all grounded.

[0027] Furthermore, the power input module 10 outputs the system operating voltage through the first step-down module 51 and charges the battery module 20 through the second step-down module 52; The system operating voltage supplies power to the control module 40 through the third step-down module 52.

[0028] In this embodiment, by employing multiple independent step-down modules, customized and isolated management of the power supply voltage for different power-consuming units is achieved. A third step-down module is dedicated to powering the control module, providing it with an extremely clean and stable power supply. This maximizes the operational stability of the core control unit (MCU) and prevents program crashes or communication interruptions caused by power supply noise, which is a key guarantee for reliable data reporting. Furthermore, by distributing power loss across different step-down modules, the overheating problem of a single component is avoided, improving the long-term reliability of the system.

[0029] Further, the second step-down module 52 includes a voltage regulator U1, a diode D1, capacitors C1, C2, C3, C4, C5, and C6, resistors R1, R2, R3, R4, and R5, LED1, and a charging management module U2, wherein: Regulator U1 is connected to power input module 10 via diode D1, and the connection point between regulator U1 and diode D1 is grounded via capacitor C2. The output voltage terminal of regulator U1 is connected to the enable terminal, and the connection points are grounded via capacitor C1, resistor R1, capacitor C3, and capacitor C4 respectively. The output voltage terminal of regulator U1 is also connected to one end of resistor R2, one end of LED1, and the power input terminal of charging management module U2. The other end of resistor R2 is grounded via capacitor C6. The other end of LED1 is connected to the status indicator terminal of charging management module U2 via resistor R3. The status indicator terminal of charging management module U2 is also connected to the CH_STAT pin of control module 40 via resistor R4. The CH_STAT pin is used to determine whether the battery is charging and is only reserved for future use. The charging status indicator of the charging management module U2 is connected to the other end of LED1; The charging current setting terminal of the charging management module U2 is connected to one end of the resistor R5; the battery connection terminal of the charging management module U2 is connected to one end of the capacitor C5 and the battery module 20; the other end of the resistor R5 and the other end of the capacitor C5 are both grounded.

[0030] This embodiment employs a dedicated charging management chip U2, which can automatically realize a complete charging process including constant current charging, constant voltage charging, and trickle charging. This not only greatly shortens the charging time but also protects the battery from overcharging damage, significantly extending battery life. LED indicators visually display the battery's charging status (e.g., charging in progress, fully charged), facilitating on-site maintenance and status confirmation for users. An external resistor R5 allows for flexible setting of the maximum charging current, enabling it to adapt to batteries of different capacities and types, enhancing the circuit's versatility and safety.

[0031] Furthermore, the third step-down module 53 includes a voltage regulator U18, a capacitor C8, and a capacitor C9; The system operating voltage is connected to the input voltage terminal of the third step-down module 53 and one end of capacitor C8; the output voltage terminal and the enable terminal of the third step-down module 53 are connected, and its connection node is connected to one end of capacitor C9 and supplies power to the control module 40. The other end of capacitor C8 and the other end of capacitor C9 are both grounded.

[0032] In this embodiment, the maximum charging current can be flexibly set by using an external resistor R5, making it adaptable to batteries of different capacities and types, thus enhancing the versatility and safety of the circuit. The circuit structure has a small number of components, high reliability, and low failure rate, ensuring the overall intelligent control system.

[0033] As described above, the core of the circuit lies in using the first MOSFET Q1 and the second MOSFET Q2 connected back-to-back. BAT_PWR_ON and BAT_PWR_MOS are used as control pins to manage the on and off states of the first MOSFET Q1 and the second MOSFET Q2. BAT_VCC_AD is used to detect the current power supply. Diode D7 and the first MOSFET Q1 and the second MOSFET Q2 enable uninterrupted switching between two power supplies (two power supplies: SYS_+5V is the system power supply converted from the input VIN by the first step-down module (DC-DC power supply), and VBAT is the onboard button lithium battery). +3.3V is the final power supply to the control module 40 (MCU) and other application circuits.

[0034] Work process: When VIN is connected to the adapter power supply, the system power supply SYS_+5V is provided via DC-DC converter. Simultaneously, a small current is used to charge the lithium battery VBAT through voltage regulator U1 and charging management chip U2, ensuring sufficient operating time to issue a power outage warning after the adapter is disconnected. When VIN is connected, the MCU controls the first MOSFET Q1 to turn on and the second MOSFET Q2 to turn off. At this time, because the lithium battery voltage of 4.2V is reduced to 3.5V after passing through the body diode of the second MOSFET Q2, which is less than (SYS_+5V-0.7V), the actual +5V voltage is (SYS_+5V-0.7V), ensuring normal system operation. At the same time, the body diode of the second MOSFET Q2 is reverse-biased and cut off in the judgment state to prevent +5V from impacting the lithium battery. During system operation, the control module 40 (MCU) continuously samples the voltage value of BAT_VCC_AD to monitor the power supply status in real time.

[0035] When VIN is de-energized, due to the presence of the body diode in the second MOSFET Q2, +5V automatically switches to the BAT power supply. BAT_VCC_AD detects the low +5V and turns on the second MOSFET Q2, allowing the battery power supply to directly supply +5V without being affected by the voltage drop across the body diode of the second MOSFET Q2. Simultaneously, the control module 40 (MCU) immediately reports the power failure information to the server. After transmission, it turns off the first MOSFET Q1, stopping battery power supply and completely de-energizing the system. Because the first MOSFET Q1 is de-energized, the power consumption of the VBAT lithium battery is reduced.

[0036] Repeat the above process when VIN is connected to the adapter power supply again.

[0037] In the above circuit, the control module 40 uses models including but not limited to GD32F303RCT6; the voltage regulator U1 uses models including but not limited to ASM1117-5.0V; the charging management chip U2 uses models including but not limited to YC4055; the voltage regulator U18 uses models including but not limited to ASM1117-3.3V; transistors Q3 and Q4 use models including but not limited to DTC143; the step-down converter U12 uses models including but not limited to SG1330; the first MOSFET Q1, the second MOSFET Q2, and the fifth MOSFET Q5 use models including but not limited to NP3401; transistors Q6 and Q7 use models including but not limited to DTC143; the model parameters of the other components can be selected according to actual needs and parameter design, and will not be elaborated here.

[0038] This utility model also provides a printer that uses the cloud printing power management circuit with power failure reminder as described above.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cloud printing power management circuit with power failure reminder, characterized in that, include: The power input module (10) is used to connect an external power source and convert it to the system operating voltage; A battery module (20) is connected to the power input module (10) and is used to provide backup power when the external power supply is disconnected; The power switching module (30) includes a first MOSFET Q1 and a second MOSFET Q2. The first MOSFET Q1 and the second MOSFET Q2 form a back-to-back structure. The system operating voltage output terminal of the power input module (10) is connected to the battery module (20) in sequence through the second MOSFET Q2 and the first MOSFET Q1. The control module (40) is connected to the system operating voltage output terminal of the power input module (10), the first MOSFET Q1, and the second MOSFET Q2, respectively, and samples the system operating voltage in real time. The control module (40) communicates with an external server, wherein: When the printer's external power supply is normal, the control module (40) controls the first MOSFET Q1 to turn on and the second MOSFET Q2 to turn off, so that the system working voltage can supply power and charge the battery module (20); When the printer's external power supply is disconnected, the second MOSFET Q2 is turned on to switch to power supply from the battery module (20); and a printer power failure message is sent to the server. After the message is sent, the first MOSFET Q1 is turned off to stop the battery module (20) from supplying power.

2. The cloud printing power management circuit with power failure reminder as described in claim 1, characterized in that: The power switching module (30) also includes a diode D7, whose anode is connected to the system operating voltage and whose cathode is connected to the second MOS transistor Q2 and the control module (40).

3. The cloud printing power management circuit with power failure reminder as described in claim 1 or 2, characterized in that: The power switching module (30) also includes transistor Q3, transistor Q4, resistors R6, R7, R8, R9, R10, R11, R12, R13 and capacitor C7. The drains of the first MOSFET Q1 and the second MOSFET Q2 are connected; The system operating voltage output terminal of the power input module (10) is connected to one end of resistor R9, the power supply terminal of the control module (40), the source of the second MOS transistor Q2, and one end of resistor R8; resistor R9 is grounded through resistor R13, and the connection node of resistor R9 and resistor R13 is connected to the control module (40) through resistor R11. The gate of the second MOSFET Q2 is connected to the collector of the transistor Q4. The connection node between the gate of the second MOSFET Q2 and the collector of the transistor Q4 is connected to the other end of the resistor R8. The emitter of the transistor Q4 is grounded, and the base of the transistor Q4 is connected to the control module (40). The connection node between the drains of the first MOSFET Q1 and the second MOSFET Q2 is connected to one end of capacitor C7 and one end of resistor R7, respectively; the other end of capacitor C7 is grounded; the other end of resistor R7 is grounded through resistor R12; the connection node between resistor R7 and resistor R12 is connected to the control module (40) through resistor R10. The gate of the first MOSFET Q1 is connected to one end of resistor R6 and the collector of transistor Q3. The emitter of transistor Q3 is grounded and the base of transistor Q3 is connected to the control module (40). The other end of resistor R6 and the source of the first MOSFET Q1 are both connected to the battery module (20).

4. The cloud printing power management circuit with power failure reminder as described in claim 1, characterized in that: The power input module (10) outputs the system operating voltage through the first step-down module (51) and charges the battery module (20) through the second step-down module (52); The system operating voltage supplies power to the control module (40) through the third step-down module (53).

5. The cloud printing power management circuit with power failure reminder as described in claim 4, characterized in that: The first step-down module (51) includes a step-down transformer U12, a fuse resistor FB3, a fifth MOSFET Q5, a transistor Q6, a transistor Q7, capacitors C38, C39, C40, C42, C43, C44, CP4, a diode D8, a resistor R66, an inductor CK1, resistors R67, R68, R69, and R70, wherein: The power input module (10) is connected to one end of the fuse resistor FB3. The other end of the fuse resistor FB3 is connected to one end of capacitor C39, one end of capacitor C40, one end of resistor R66, and the voltage input pin of step-down transformer U12. The other ends of capacitor C39 and capacitor C40 are grounded. The other end of resistor R66 is connected to the enable pin of step-down transformer U12. The switching node pin of step-down transformer U12 is connected to one end of inductor CK1 and one end of capacitor C38. The other end of capacitor C38 is connected to the bootstrap pin of step-down transformer U12. The feedback pin of step-down transformer U12 is connected to one end of resistor R70, one end of resistor R67, and one end of capacitor C42. The other ends of resistor R67, capacitor C42, and inductor CK1 are all connected to... One end of capacitor C43, one end of capacitor C44, one end of capacitor CP4, and the anode of diode D8 are connected; the cathode of diode D8 is connected to the source of fifth MOS transistor Q5, one end of resistor R68, and one end of resistor R59 respectively; the other end of resistor R68 is connected to the base of transistor Q6 and the collector of transistor Q7; the other end of resistor R69 is connected to the gate of fifth MOS transistor Q5 and the collector of transistor Q6; the drain of fifth MOS transistor Q5 is connected to the power switching module (30); the emitters of transistor Q6 and Q7 are both grounded; the base of transistor Q7 is connected to the control module (40); the other ends of resistor R70, capacitor C43, capacitor C44, and capacitor CP4 are all grounded.

6. The cloud printing power management circuit with power failure reminder according to claim 4, characterized in that: The second step-down module (52) includes a voltage regulator U1, a diode D1, capacitors C1, C2, C3, C4, C5, and C6, resistors R1, R2, R3, R4, and R5, LED1, and a charging management module U2, wherein: The voltage regulator U1 is connected to the power input module (10) through diode D1, and the connection node between the voltage regulator U1 and diode D1 is grounded through capacitor C2; the output voltage terminal of the voltage regulator U1 is connected to the enable terminal, and the connection node is grounded through capacitor C1, resistor R1, capacitor C3, and capacitor C4 respectively; the output voltage terminal of the voltage regulator U1 is also connected to one end of resistor R2, one end of LED1, and the power input terminal of the charging management module U2; the other end of resistor R2 is grounded through capacitor C6; the other end of LED1 is connected to the status indicator terminal of the charging management module U2 through resistor R3; the status indicator terminal of the charging management module U2 is also connected to the control module (40) through resistor R4; The charging status indicator of the charging management module U2 is connected to the other end of LED1; The charging current setting terminal of the charging management module U2 is connected to one end of the resistor R5; the battery connection terminal of the charging management module U2 is connected to one end of the capacitor C5 and the battery module (20); the other end of the resistor R5 and the other end of the capacitor C5 are grounded.

7. The cloud printing power management circuit with power failure reminder as described in claim 4, characterized in that: The third step-down module (53) includes a voltage regulator U18, a capacitor C8, and a capacitor C9; The system operating voltage is connected to the input voltage terminal of the third step-down module (53) and one end of capacitor C8; the output voltage terminal and the enable terminal of the third step-down module (53) are connected, and its connection node is connected to one end of capacitor C9 and to supply power to the control module (40); The other end of capacitor C8 and the other end of capacitor C9 are both grounded.

8. A printer, characterized in that: The cloud printing power management circuit with power failure reminder as described in any one of claims 1-7 is adopted.

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