Multifunctional intelligent mobile power supply equipment

Abstract

The invention relates to multifunctional intelligent mobile power supply equipment, and belongs to the technical field of mobile power supplies. The inverter comprises a frequency conversion part, a transformer part, a full-wave rectification part and an inversion part, the frequency conversion part, the transformer part, the full-wave rectification part and the inversion part are connected in sequence; the frequency conversion part is used for converting a 48V battery into a high-frequency alternating current signal through an H-bridge circuit; the transformer part is used for boosting the high-frequency alternating-current signal into various alternating-current voltages; the full-wave rectification part is used for converting various alternating-current voltages into direct-current voltages; the inversion part is used for converting a certain DC voltage into a 220V AC voltage through an H-bridge inversion circuit. The problem of recovering power supply in a short time when an important load power supply loop fails can be solved.

Description

Technical Field

[0001] The invention relates to a multifunctional intelligent mobile power supply device, belonging to the technical field of mobile power supplies. Background Art

[0002] During work, we may encounter power circuit failure from time to time, which may cause important AC or DC loads to be unable to be powered on in a short time, leading to serious consequences such as forced shutdown of equipment. For example, one year, a 110kv main transformer was shut down due to a defect in a station transformer. Under the condition of single air-cooled power supply, the air-cooled power circuit failed, causing the transformer to lose cooler power for 5 hours during peak load, forcing the transformer to reduce load. Another example: During the power supply guarantee period of a large-scale event site in a certain year, due to the failure of the socket circuit (hidden wire in the wall) for the rostrum to draw power, the rostrum of the conference lost power for 30 minutes. Emergency power generation equipment was configured on site but did not work. In the case of power circuit failure of these important loads, or failure of important and complex power circuits in power supply guarantee sites, it is necessary to have equipment that can restore its function in a relatively short time to improve the ability of emergency power supply for important low-voltage circuit failures. Summary of the invention

[0003] The technical problem to be solved by the present invention is: the present invention provides a multifunctional intelligent mobile power supply device, which is used to solve the problem of short-term power supply when an important load power supply circuit fails. It can convert a 48V battery into a high-frequency AC signal through an H-bridge circuit, can boost the high-frequency AC signal into a variety of AC voltages, can convert a variety of AC voltages into DC voltages, and can convert a certain DC voltage into a 220V AC voltage through an H-bridge inverter circuit.

[0004] The technical solution of the present invention is: a multifunctional intelligent mobile power supply device, comprising a frequency conversion part, a transformer part, a full-wave rectification part, and an inverter part; the frequency conversion part, the transformer part, the full-wave rectification part, and the inverter part are connected in sequence; The frequency conversion part is used to convert the 48V battery into a high-frequency AC signal through an H-bridge circuit; The transformer part is used to boost the high-frequency AC signal into a variety of AC voltages; The full-wave rectification part is used to convert a variety of AC voltages into DC voltages; The inverter part is used to convert a certain DC voltage into a 220V AC voltage through an H-bridge inverter circuit.

[0005] As a further solution of the present invention, the frequency conversion circuit of the frequency conversion part adopts an H-bridge circuit, and a square wave signal equal to the input signal can be generated by controlling the switch on the H-bridge; the H-bridge circuit realizes the bidirectional flow of current through the configured MOS tube array, thereby generating the required high-frequency AC signal; the H-bridge circuit design adopts the strategy of connecting two MOS tubes in parallel as a single switch; the PWM signal generated by the microcontroller in the H-bridge circuit is used to control the conduction and shutdown of the MOS tube.

[0006] As a further solution of the present invention, the frequency conversion circuit of the frequency conversion part also includes a variety of auxiliary circuits, the auxiliary circuits include a short circuit protection circuit, a battery current detection circuit, a battery voltage detection circuit and a post-stage full-wave rectifier voltage acquisition circuit; The short-circuit protection circuit uses the AMC23C12DWV chip to monitor the abnormal current flowing back to the ground in the H-bridge circuit; once it is detected that the current value exceeds the preset safety threshold, the AMC23C12DWV will immediately output a high or low level fault signal to the microcontroller; The battery current detection circuit uses the INA240A1 chip as a core component; The battery voltage detection circuit safely reduces the high voltage of the battery to an acceptable input range of the MCU through the resistor voltage division principle; The full-wave rectifier voltage acquisition circuit adopts the AMC1200BDWVR chip to accurately acquire the DC voltage up to 350V output by the subsequent full-wave rectifier circuit; the voltage signal acquired by the AMC1200BDWVR chip is sent to the microcontroller for digital processing after signal conditioning.

[0007] As a further solution of the present invention, the frequency conversion part also includes a control circuit, which includes a microcontroller. The microcontroller integrates multiple key sub-circuits, including a 5V to 3.3V power conversion circuit, a download debugging circuit, a crystal oscillator clock circuit, a filter stabilization circuit, and a reset protection circuit; the microcontroller outputs key PWM control signals, which directly drive the MOS tube switches in the full-bridge circuit to achieve efficient conversion of electrical energy; at the same time, the microcontroller also manages the activation and release of the short-circuit protection circuit by controlling the LATCH signal; the MOS_EN signal is also controlled by the microcontroller to enable or disable the MOS tube drive circuit.

[0008] As a further solution of the present invention, the full-wave rectifier part receives various forms of AC voltages output from the pre-amplifier circuit as input; the full-wave rectifier circuit is also used to convert these AC voltages into stable DC voltages; after the conversion is completed, DC voltages of various specifications such as DC 220V, DC 110V, DC 48V, DC 24V, and DC 12V are output through a preset output interface to meet the power supply requirements of different devices and circuits.

[0009] As a further solution of the present invention, the full-wave rectifier part integrates the P4 connection point, allowing this high voltage to be directly connected to the full-wave rectifier voltage acquisition circuit for real-time monitoring and verification of the JP26 interface output voltage.

[0010] As a further solution of the present invention, the inverter part includes a power circuit, a filter circuit, and a main control part; The power circuit is used to convert the input DC voltage into a voltage signal in the form of sinusoidal pulse width modulation (SPWM); The filter circuit is used to filter the processed SPWM voltage signal; The main control part gathers key data from various parts and performs processing and decision-making.

[0011] As a further solution of the present invention, the core of the power circuit is an H-bridge structure, the main body of which is composed of four key IGBT transistors; the H-bridge receives a DC voltage of up to 350V as input from the interface of the full-wave rectifier part. After receiving this input, the H-bridge converts the input DC voltage into a voltage signal in the form of sinusoidal pulse width modulation (SPWM) by precisely controlling the switching state of the IGBT transistor; the SPWM voltage signal processed by the H-bridge is filtered by a filtering circuit; As a further solution of the present invention, the power circuit further includes an auxiliary circuit, the auxiliary circuit including a current measurement auxiliary circuit, a voltage measurement auxiliary circuit, a short circuit protection circuit, and a main control circuit; The current measurement auxiliary circuit adopts CC6900SO chip; The voltage measurement auxiliary circuit adopts the AMC1200 chip; The short-circuit protection circuit responds quickly when a short-circuit fault is detected, and protects the system from damage by cutting off the relevant circuit or adjusting the working state; The main control circuit includes multiple key sub-circuits, including a crystal oscillator circuit, a filter circuit, and a buck circuit; the crystal oscillator circuit provides an accurate clock signal for the MCU; the filter circuit is responsible for removing high-frequency noise and interference on the power line and signal line; the buck circuit converts the 5V voltage provided by the main control board into 3.3V through the AMS1117 chip.

[0012] As a further solution of the present invention, the filtering circuit effectively filters out the high-frequency harmonic components in the original SPWM waveform, thereby restoring a pure 220V sinusoidal voltage; the main control part gathers key data such as voltage and current from various parts, and processes and makes decisions. It not only integrates the basic circuits to ensure the normal operation of the microcontroller MCU, including crystal oscillator circuit, download circuit, reset circuit and filtering circuit; it is also responsible for receiving and processing real-time voltage and current signals from other parts.

[0013] The beneficial effects of the present invention are: 1. The present invention can convert a 48V battery into a high-frequency AC signal through an H-bridge circuit, can boost a high-frequency AC signal into a variety of AC voltages, can convert a variety of AC voltages into DC voltages, and can convert a certain DC voltage into a 220V AC voltage through an H-bridge inverter circuit. 2. The present invention uses lithium batteries as carriers for a large-capacity, portable backup battery box. Compared with the currently used lead-acid batteries, the battery pack has an energy density 3-4 times higher, and the volume and weight are reduced to about 1 / 4 of the original. The portable battery pack can provide 12V, 24V, 48V, 110V, 220V and connecting wires, and has an interface for inverting to 220V AC output. The device has multiple parallel interfaces, and multiple power boxes can be combined into a larger capacity battery box as needed; it is used to solve the problem of restoring power supply to important load power circuits in a short time when they fail; the design mainly includes a boost circuit, a full-wave rectifier circuit, an inverter circuit and an SPWM filter circuit. 3. The equipment can be widely used in all occasions where rapid restoration of power supply to local electrical equipment is required. It can be used to quickly provide power to the scene in case of power supply guarantee and emergency rescue and disaster relief. It can also be used in some temporary power supply places where power is far away or difficult to obtain by wires and cables. It has broad application prospects. 4. The device is also equipped with a 10-200W USB charging port, which can directly charge mobile phones and digital products normally and quickly. In addition, it is also equipped with a retractable and storable lighting device, which can realize emergency lighting in certain situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the frequency conversion circuit of the present invention; Figure 3 It is a schematic diagram of an H bridge in a frequency conversion circuit of the present invention; Figure 4 It is a schematic diagram of other parts of the frequency conversion circuit of the present invention except the H bridge; Figure 5It is a schematic diagram of a short-circuit protection circuit and a battery current detection circuit of the present invention; Figure 6 It is a schematic diagram of a battery voltage detection circuit of the present invention; Figure 7 It is a schematic diagram of the full-wave rectifier voltage collection circuit of the present invention; Figure 8 It is a schematic diagram of the control circuit of the boost part in the frequency conversion circuit of the present invention; Fig. 9 It is a partial circuit diagram of the control circuit of the present invention; Fig.10 It is a schematic diagram of a full-wave rectifier circuit of the present invention; Fig.11 It is a schematic diagram of the power part of the inverter of the present invention; Fig.12 It is a schematic diagram of the H-bridge body of the present invention; Fig.13 is a schematic diagram of an auxiliary power supply of the present invention; Fig.14 It is a schematic diagram of the voltage and current detection auxiliary circuit of the present invention; Fig.15 It is a schematic diagram of a short-circuit protection circuit of the present invention; Fig.16 It is a schematic diagram of the main control circuit of the present invention; Fig.17 It is a schematic diagram of the post-stage filter circuit of the present invention; Fig.18 It is a schematic diagram of the current detection part after the filter circuit of the inverter part of the present invention; Fig.19 It is a schematic diagram of the voltage detection part after the filter circuit of the inverter part of the present invention; Fig. 20 It is a schematic diagram of the main control part of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Example 1: Figure 1 As shown, a multifunctional intelligent mobile power supply device, Figure 1The device block diagram shown includes a frequency conversion part, a transformer part, a full-wave rectifier part, and an inverter part. The device is designed to process the battery voltage through multiple stages and finally convert it into a variety of stable and usable DC voltage outputs, while supporting further inverter processing of a specific high voltage (350V). The whole process can be divided into four core parts, each of which plays an indispensable role. The frequency conversion part, transformer part, full-wave rectifier part, and inverter part are connected in sequence. The frequency conversion part is used to convert the 48V battery into a high-frequency AC signal through an H-bridge circuit. The transformer part is used to boost the high-frequency AC signal into a variety of AC voltages. The full-wave rectifier part is used to convert a variety of AC voltages into DC voltages. The inverter part is used to convert a certain DC voltage into a 220V AC voltage through an H-bridge inverter circuit.

[0017] Part 1: Frequency conversion part (located in Figure 1 The first dotted box) This part is the starting point of the whole system. It is responsible for converting the original battery voltage into a high-frequency AC signal with a frequency set to 100KHZ. This conversion process not only helps to reduce the energy loss in the subsequent voltage transformation process, but also improves the efficiency and response speed of the whole system. The generation of high-frequency AC signals is usually achieved by controlling the H-bridge through PWM (pulse width modulation) technology to ensure the stability and adjustability of the output voltage.

[0018] Part 2: Transformer part (located in Figure 1 The first solid line frame) The transformer part is the key conversion link of the system. It receives the high-frequency AC signal from the frequency conversion part and performs voltage conversion through a carefully designed transformer structure. The transformer is equipped with multiple taps, each of which corresponds to a different voltage ratio, thereby achieving fine adjustment of the input voltage and outputting multiple voltage levels including but not limited to 350V, 220V, 110V, 48V, 24V and 12V. This design greatly enhances the flexibility and applicability of the system, allowing the same system to meet a variety of different voltage requirements.

[0019] Part 3: Full-wave rectifier (located in Figure 1 The second dotted box) After the transformer transforms various voltages, they are all AC. In order to convert these AC voltages into DC voltages, the system introduces a full-wave rectifier circuit. With its high efficiency and stable performance, the full-wave rectifier circuit can ensure the smoothness and purity of the output voltage. After rectification, voltages such as 350V, 220V, 110V, 48V, 24V and 12V are all converted into stable DC voltages, providing reliable power supply guarantee for subsequent electrical equipment.

[0020] Part 4: Inverter part (located at Figure 1 The second dotted box) This part receives a stable 350V DC voltage from the previous stage circuit, and efficiently converts the DC power into 220V AC voltage through a precisely designed H-bridge inverter circuit. Subsequently, a high-quality filter circuit further purifies the output waveform and removes harmonic interference, ensuring that the output AC voltage waveform is pure and stable, meeting the use requirements of various electrical equipment.

[0021] Example 2: Figure 2-Figure 20 As shown, a multifunctional intelligent mobile power supply device includes a frequency conversion part, a transformer part, a full-wave rectifier part, and an inverter part; the device is designed to process the battery voltage through multiple stages and finally convert it into a variety of stable and usable DC voltage outputs, while supporting further inverter processing of a specific high voltage (350V). The whole process can be divided into four core parts, each of which plays an indispensable role; the frequency conversion part, transformer part, full-wave rectifier part, and inverter part are connected in sequence; the frequency conversion part is used to convert a 48V battery into a high-frequency AC signal through an H-bridge circuit; the transformer part is used to boost the high-frequency AC signal into a variety of AC voltages; the full-wave rectifier part is used to convert a variety of AC voltages into DC voltages; the inverter part is used to convert a certain DC voltage into a 220V AC voltage through an H-bridge inverter circuit.

[0022] like Figure 2 As shown, the frequency conversion circuit of the frequency conversion part adopts an H-bridge circuit, and a square wave signal with the input signal can be generated by controlling the four switches on the H-bridge; the H-bridge circuit realizes the bidirectional flow of current through the configured MOS tube array, thereby generating the required high-frequency AC signal; the H-bridge circuit design adopts the strategy of connecting two MOS tubes in parallel as a single switch; the PWM signal generated by the microcontroller in the H-bridge circuit is used to control the conduction and shutdown of the MOS tube.

[0023] In frequency conversion circuits, the H-bridge is a key component that converts a DC power source (such as a battery) into an AC output. Figure 3 In the H-bridge design shown, JP1 and JP2 are connected to the positive and negative poles of the battery as input interfaces. This H-bridge realizes the bidirectional flow of current through the configured MOSFET (metal oxide semiconductor field effect transistor, MOS tube for short) array, thereby generating the required high-frequency AC signal. In order to improve the voltage resistance and current handling capabilities of the circuit, the design adopts the strategy of connecting two MOS tubes in parallel as a single switch. Specifically, Q1 and Q2 are connected in parallel as a group of switches, Q3 and Q4 are connected in parallel as another group of switches, and similarly, Q5 and Q6, Q7 and Q8 are also connected in parallel as switches. This configuration ensures that each switch can operate stably and reliably under high voltage and high current conditions.

[0024] Figure 4 As shown in the figure, the PWM signal generated by the microcontroller (MCU) is used to control the on and off of these MOS tubes. The MCU can accurately adjust the duty cycle of the PWM signal to achieve precise control of the output AC signal voltage. When Q1, Q2 and Q7, Q8 are turned on at the same time, and Q3, Q4, Q5, Q6 are turned off, the current flows from JP1 through Q1, Q2 to JP4, and then flows back to the negative electrode of the battery (JP5) through the transformer (assuming it is connected) and JP3, forming a positive current path. Subsequently, by switching Q1, Q2 and Q7, Q8 to the off state and turning on Q3, Q4 and Q5, Q6 at the same time, the current direction is reversed, flowing from JP1 through Q3 and Q4 to JP3, and then flowing back to JP5 through the transformer and JP4, forming a reverse current path. By quickly turning on and off these two sets of switches alternately, a high-frequency AC signal can be generated between JP3 and JP4.

[0025] When designing an H-bridge circuit using the UCC21520DWR as a MOSFET driver, the chip's advanced features are fully utilized to ensure efficient and safe MOSFET switching operations. The UCC21520DWR receives complementary PWM signals (PWMA / PWMAN and PWMB / PWMBN), which are precisely controlled by a microcontroller (MCU) to achieve high-frequency AC signal generation.

[0026] To prevent potential short-circuit conditions, an enable control signal is introduced, which is generated by the MCU. When the enable signal is valid, the output drive circuit of the UCC21520DWR is activated, allowing the PWM signal to control the switching state of the MOSFET. Once a fault is detected or when the driven output is not needed, the enable signal is disabled, immediately cutting off all outputs to ensure that the MOSFET remains in the off state, thereby protecting the circuit from damage.

[0027] In addition to the power circuit, the frequency conversion circuit of the frequency conversion part also integrates a variety of auxiliary circuits to improve the safety, monitoring accuracy and overall performance of the system. These auxiliary circuits include short-circuit protection circuit, battery current detection circuit, battery voltage detection circuit and post-stage full-wave rectifier voltage acquisition circuit.

[0028] Short circuit protection circuit (such as Figure 5 The AMC23C12DWV chip is an important guarantee for system safety. The core of this circuit uses the AMC23C12DWV chip, which can accurately monitor the abnormal current flowing back to the ground in the H-bridge circuit. Once it detects that the current value exceeds the preset safety threshold, the AMC23C12DWV will immediately output a high or low level fault signal to the microcontroller (MCU). After receiving this signal, the MCU will respond quickly and effectively prevent damage caused by short circuits by shutting down the output of the power circuit to ensure system safety.

[0029] The battery current detection circuit is also crucial, and it uses the INA240A1 chip as its core component. The INA240A1 not only has high-precision current measurement capabilities, but also can amplify the collected weak current signals to make them more suitable for the analog-to-digital conversion (ADC) input range of the MCU. This design enables the MCU to accurately read the output current of the battery, providing key data support for battery management, system efficiency optimization, and fault warning.

[0030] Battery voltage detection circuit (such as Figure 6 The high voltage of the battery is safely reduced to the acceptable input range of the MCU through a simple resistor voltage division principle. This design not only protects the MCU from high voltage shocks, but also ensures the accuracy and reliability of voltage acquisition. By monitoring the battery voltage in real time, the system can understand the battery status in a timely manner, providing an important basis for energy management, charging control and fault warning.

[0031] These auxiliary circuits complement the power circuits and together form an efficient, safe and reliable power conversion and control system. They not only improve the overall performance of the system, but also enhance the system's self-protection capabilities, providing a strong guarantee for the long-term stable operation of the equipment.

[0032] Full-wave rectifier voltage acquisition circuit (such as Figure 7 The AMC1200BDWVR chip is used to accurately collect the DC voltage up to 350V output by the subsequent full-wave rectifier circuit. This acquisition process is crucial to achieve closed-loop control of the output voltage, because it ensures that the system can monitor and adjust the output voltage in real time to prevent output deviations caused by various factors (such as load changes, temperature changes, etc.).

[0033] As a high-precision, isolated analog signal converter, the AMC1200BDWVR chip can effectively isolate the electrical connection between the high-voltage side and the low-voltage side (such as the MCU control end) while maintaining accurate signal transmission. This isolation design not only improves the safety of the system, but also reduces the measurement errors caused by common-mode interference and ground potential differences.

[0034] The voltage signal collected by the AMC1200BDWVR chip is sent to the microcontroller (MCU) for digital processing after appropriate signal conditioning. The MCU compares the collected voltage value with the preset target voltage value and adjusts the working state of the power circuit through a closed-loop control algorithm, thereby achieving precise control of the output voltage.

[0035] In summary, the combination of the full-wave rectifier voltage acquisition circuit and the closed-loop control strategy ensures the stability and accuracy of the system output voltage and improves the performance and reliability of the overall system.

[0036] The frequency conversion part also includes a control circuit, which serves as the core of the system. Figure 8 As shown, the control circuit includes a microcontroller, which integrates multiple key sub-circuits, including a 5V to 3.3V power conversion circuit, a download debugging circuit, a crystal oscillator clock circuit, a filter stabilization circuit, and a reset protection circuit; these sub-circuits work together to provide a stable working environment for the microcontroller (MCU) and ensure that it can accurately control the operation of the entire system.

[0037] In the control circuit, the microcontroller MCU plays a vital role. It is not only responsible for outputting key PWM control signals (PWMA, PWMAN, PWMB, PWMBN), which directly drive the MOSFET switches in the full-bridge circuit to achieve efficient conversion of electrical energy; at the same time, the MCU also manages the activation and release of the short-circuit protection circuit by controlling the LATCH signal, ensuring that the power output can be quickly cut off when a short-circuit fault is detected to protect the system safety.

[0038] In addition, the MOS_EN signal is also controlled by the MCU to enable or disable the MOSFET drive circuit, thereby achieving flexible control of the working state of the power circuit. This design improves the flexibility and reliability of the system, allowing the MCU to quickly adjust the circuit's working mode according to system requirements or fault conditions.

[0039] The voltage signal obtained by the full-wave rectifier voltage acquisition circuit is also input into the MCU in real time as an important parameter for closed-loop control feedback. The MCU uses a closed-loop control algorithm to adjust the duty cycle or frequency of the PWM signal by comparing the difference between the actual output voltage and the preset target voltage, thereby achieving precise control of the output voltage. This closed-loop control mechanism ensures the stability and accuracy of the system output voltage and improves the performance of the overall system.

[0040] In addition to the key control signals directly processed by the MCU, the control circuit part is also designed with a data transmission interface for transmitting the monitoring data related to indirect control to the main control board in real time. Fig. 9 As shown, this design ensures the information flow and collaborative work among the components of the system.

[0041] The battery current signal (IBAT_ADC) and battery voltage signal (VBAT_ADC) are directly transmitted to the main control board. This design reduces the burden on the control circuit MCU, allowing it to focus on core control tasks while ensuring the integrity and real-time performance of key monitoring data.

[0042] In addition, in order to enhance the flexibility and scalability of the system, the control circuit also reserves a serial communication interface (such as UART) for two-way communication with the main control board. Through serial communication, the main control board can query the status information of the control circuit in real time, receive monitoring data, and send control instructions or parameter adjustment commands to the control circuit. This communication mechanism not only improves the overall response speed of the system, but also makes it possible to achieve remote monitoring and fault diagnosis.

[0043] like Fig.10 As shown in the figure, the full-wave rectifier circuit is the core link of the voltage conversion of the system. The full-wave rectifier receives various forms of AC voltage output from the front-stage amplifier circuit as input; in view of the AC characteristics of the front-stage voltage, the key role of the full-wave rectifier circuit is to efficiently convert these AC voltages into stable DC voltages. After the conversion is completed, the system outputs DC voltages of various specifications such as DC 220V, DC 110V, DC48V, DC 24V, DC 12V, etc. through the preset output interfaces (JP28, JP30, JP32, JP34, JP36) to meet the power supply requirements of different devices and circuits.

[0044] In this full-wave rectifier circuit, the JP26 interface is designed to output a DC 350V voltage to meet the high-voltage DC requirements in specific AC applications. In order to ensure that the voltage output by JP26 is accurate, the P4 connection point is integrated in the circuit, allowing this high voltage to be directly connected to the full-wave rectifier voltage acquisition circuit described above. This design not only realizes real-time monitoring and verification of the JP26 output voltage, but also enhances the system's self-diagnosis and protection capabilities, ensuring the stability and reliability of the entire power conversion system. Through this closed-loop monitoring mechanism, the system can promptly detect and correct any potential voltage deviations, thereby ensuring the accuracy and consistency of the output voltage.

[0045] As a further solution of the present invention, the inverter part includes a power circuit, a filter circuit, and a main control part; the main function of the inverter circuit is to convert DC into AC, and the power part circuit is as follows Fig.11 As shown; The power circuit is used to convert the input DC voltage into a voltage signal in the form of sinusoidal pulse width modulation (SPWM); The filter circuit is used to filter the processed SPWM voltage signal; The main control part gathers key data from various parts and performs processing and decision-making.

[0046] As a further solution of the present invention, the core of the power circuit is an H-bridge structure, such as Fig.12As shown in the figure, the main body is composed of four key IGBT transistors (Q2, Q3, Q4, Q5); the H-bridge receives a DC voltage of up to 350V as input from the interfaces JP2 and JP4 of the full-wave rectifier part. After receiving this input, the H-bridge converts the input DC voltage into a voltage signal in the form of sinusoidal pulse width modulation (SPWM) by precisely controlling the switching state of the IGBT transistors. This conversion not only improves the voltage utilization efficiency, but also enhances the controllability and stability of the output voltage.

[0047] The SPWM voltage signal processed by the H-bridge is output through the JP1 and JP5 interfaces, providing a key input source for the post-filter circuit. The post-filter circuit will further filter the SPWM signal to eliminate or reduce the harmonic components in the voltage waveform, thereby obtaining a smoother and more stable DC or AC voltage output. This cascade design not only ensures the overall output voltage quality of the system, but also improves the performance and reliability of the entire power conversion system.

[0048] In terms of driving, the chip used is the same as the boost driver chip mentioned above, but this design uses IGBT transistors as the switches of the H bridge. Fig.13 The auxiliary power supply system shown in the figure uses HVCC (i.e. DC 350V provided by the previous stage boost rectification) as the overall power source. Through the efficient conversion of the flyback transformer U3, the system can output a variety of precisely controlled voltage values ​​to meet the complex and demanding power supply requirements of the IGBT transistors in the H-bridge.

[0049] It is worth noting that in order to ensure that the IGBT can be fully turned on and operate stably, the auxiliary power supply system specially generates negative voltages including -5VB and -5V. These negative voltages and positive voltages (+15V, -5VA, +15VA, -5VB, +15VB, etc.) together form a complete power supply network, providing the necessary driving voltage and bias voltage for each IGBT transistor of the H-bridge. This sophisticated voltage distribution strategy not only ensures the fast response and efficient operation of the IGBT, but also enhances the reliability and stability of the entire H-bridge circuit.

[0050] The auxiliary power supply design is the key to the stable operation of the H-bridge circuit. Its voltage output provides a reliable power supply guarantee for the IGBT transistor, thereby ensuring that the H-bridge circuit can efficiently and stably convert the input DC 350V voltage into the required SPWM voltage signal.

[0051] In addition, the power circuit also includes auxiliary circuits, including current measurement auxiliary circuits, voltage measurement auxiliary circuits, short circuit protection circuits, and main control circuits to ensure stable operation and efficient monitoring of the system. Fig.14As shown, the current and voltage measurement circuits are specially marked in the black box, which together constitute an important part of system status monitoring.

[0052] The current measurement auxiliary circuit, with U4 as the core, uses the CC6900SO chip, which is designed for high-precision current detection and can accurately measure currents up to 30A. The current signal (idc_ADC) collected by CC6900SO is processed and transmitted to the main control board in real time for further monitoring and analysis. This design ensures that the system can detect current anomalies in a timely manner and take necessary protective measures.

[0053] The voltage measurement auxiliary circuit utilizes the high precision and isolation characteristics of the AMC1200 chip. Due to the sampling range limitation of the AMC1200, the circuit cleverly divides the voltage through precision resistors such as R26, R35, R36, and R37 to ensure that the input voltage is within the measurement range of the chip. The voltage signal (HV_ADC) collected by the AMC1200 is also transmitted to the main control board, providing key voltage feedback for the main control system.

[0054] In addition, the system is equipped with a short-circuit protection circuit (such as Fig.15 The short-circuit protection circuit can respond quickly when a short-circuit fault is detected, and protect the system from damage by cutting off the relevant circuit or adjusting the working state. This design not only improves the safety of the system, but also enhances its ability to cope with emergencies.

[0055] In summary, these auxiliary circuits together form a solid foundation for stable operation and efficient monitoring of the system. They ensure that the system can maintain optimal operation under various working conditions through accurate current and voltage measurement and fast short-circuit protection response.

[0056] In this part, there is an efficient and comprehensive main control circuit, such as Fig.16 As shown. The circuit integrates multiple key sub-circuits, including crystal oscillator circuit, filter circuit, and buck circuit; first, the crystal oscillator circuit provides an accurate clock signal for the MCU, which is the basis for ensuring system timing synchronization and data accuracy. Through this design, the MCU can execute instructions at a predetermined rhythm to achieve efficient and stable control. The filter circuit is responsible for removing high-frequency noise and interference on the power line and signal line to ensure the purity of the voltage and signal. This is crucial to improving the system's anti-interference ability and reliability.

[0057] The buck circuit converts the 5V voltage provided by the main control board to 3.3V stably through the AMS1117 (U7) chip to meet the power supply requirements of the MCU and multiple low-voltage chips. This design not only improves the efficiency of voltage conversion, but also reduces system power consumption and extends the battery life of the device. In addition, the reset circuit plays an important role in the system startup or operation process. It can restore the state of the MCU and its peripheral chips to the initial state when the system is abnormal or needs to be restarted, ensuring that the system can start or resume operation normally. The main control circuit provides a stable and reliable working environment for the MCU and its peripheral chips by integrating multiple key sub-circuits such as crystal oscillator, filtering, buck and reset. This design not only improves the overall performance of the system, but also enhances its ability to cope with complex working conditions and emergencies.

[0058] exist Fig.17 The circuit shown in the figure is a carefully designed filter circuit, the core function of which is to efficiently filter the SPWM (sinusoidal pulse width modulation) signal output by the previous H-bridge circuit. This filtering process is crucial because it can effectively filter out the high-frequency harmonic components in the original SPWM waveform, thereby restoring a pure 220V sine wave voltage. In addition, the design of the filter circuit also fully considers the overall performance and cost-effectiveness of the system. Fig.17 The filter circuit shown is an indispensable key part of the system. Through efficient filtering, it provides the system with a stable and pure 220V sinusoidal voltage output, which provides a strong guarantee for the normal operation of subsequent circuits. JP1 and JP2 are used as inputs, and JP3 and JP4 are used as output ports.

[0059] exist Fig.18 and Fig.19 In the diagram, we show in detail the current and voltage detection steps after the filter circuit. Fig.18 The current detection circuit can monitor the system output current in real time after the microcontroller detects the current value, and performs overload protection and alarm according to the set overload value. The temperature sensor collects the temperature signal and sends it to the microcontroller for real-time temperature monitoring. If the set temperature is exceeded, the microcontroller will issue a temperature alarm and perform over-temperature protection. Fig.18 For current detection, it uses the high-performance CC6900SO chip as the core. This chip is known for its high precision and fast response capability, and can accurately measure the current changes in the filtered circuit. The current signal processed by CC6900SO is ADI_ADC, which is then transmitted to the main control board, providing real-time current feedback data for the main control system, which helps the system achieve accurate current control and protection. Fig.19The voltage detection part is shown, which continues to use the high-precision isolation acquisition solution of the AMC1200 chip. In order to ensure that the AMC1200 can collect accurate voltage values ​​within its optimal operating range, the circuit cleverly designs a voltage divider network composed of R3, R4, R5, R8 and R9. These precision resistors proportionally reduce the higher filtered voltage to the input range of the AMC1200, thereby ensuring the accuracy and stability of the collected voltage signal. The voltage signal processed by the AMC1200 is ADV_ADC, and is transmitted to the main control board through the interface for further data processing and analysis.

[0060] For the main control part, Fig. 20 The core control part of the system is shown in Figure 1. Its main responsibility is to gather key data such as voltage and current from various parts of the system and to process and make decisions efficiently and accurately. This part not only integrates the basic circuits to ensure the normal operation of the MCU, such as crystal oscillator circuit, download circuit, reset circuit and filter circuit, but also receives and processes real-time data from other parts of the system.

[0061] The crystal oscillator circuit provides a stable clock signal for the MCU, ensuring the synchronization and accuracy of system operation; the download circuit provides a convenient program update and maintenance interface, enhancing the scalability and maintainability of the system; the reset circuit can reset the MCU to the initial state when necessary to ensure the stable operation of the system; and the filter circuit further filters out noise interference on the power supply and signal lines, improving the purity and reliability of the data.

[0062] In addition to these basic circuits, this part also receives and processes voltage and current signals from other parts of the system. These signals are converted into digital signals that can be recognized by the MCU through precise acquisition and conversion circuits, and then used in key links such as system status monitoring, fault diagnosis, and control decision-making. Through comprehensive analysis and processing of these data, the MCU can grasp the operating status of the system in real time and make corresponding control adjustments to ensure that the system is always in the best working state.

[0063] Fig. 20 The core control part shown is the "brain" of the entire system. It realizes efficient and precise control of the system by integrating multiple key circuits and receiving real-time data from various parts of the processing system. This design not only improves the overall performance and stability of the system, but also enhances its ability to cope with complex working conditions and emergencies.

[0064] The specific embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A multifunctional intelligent mobile power supply device, characterized in that: It includes a frequency conversion part, a transformer part, a full-wave rectification part, and an inverter part; the frequency conversion part, the transformer part, the full-wave rectification part, and the inverter part are connected in sequence; The frequency conversion part is used to convert the 48V battery into a high-frequency AC signal through an H-bridge circuit; The transformer part is used to boost the high-frequency AC signal into a variety of AC voltages; The full-wave rectification part is used to convert a variety of AC voltages into DC voltages; The inverter part is used to convert a certain DC voltage into a 220V AC voltage through an H-bridge inverter circuit.

2. The multifunctional intelligent mobile power supply device according to claim 1, characterized in that: The frequency conversion circuit of the frequency conversion part adopts an H-bridge circuit, and a square wave signal equal to the input signal can be generated by controlling the switch on the H-bridge; the H-bridge circuit realizes the bidirectional flow of current through the configured MOS tube array, thereby generating the required high-frequency AC signal; the H-bridge circuit design adopts the strategy of connecting two MOS tubes in parallel as a single switch; the PWM signal generated by the microcontroller in the H-bridge circuit is used to control the conduction and shutdown of the MOS tube.

3. The multifunctional intelligent mobile power supply device according to claim 2, characterized in that: The frequency conversion circuit of the frequency conversion part also includes a variety of auxiliary circuits, including a short-circuit protection circuit, a battery current detection circuit, a battery voltage detection circuit and a post-stage full-wave rectifier voltage acquisition circuit; The short-circuit protection circuit uses the AMC23C12DWV chip to monitor the abnormal current flowing back to the ground in the H-bridge circuit; once it is detected that the current value exceeds the preset safety threshold, the AMC23C12DWV will immediately output a high or low level fault signal to the microcontroller; The battery current detection circuit uses the INA240A1 chip as a core component; The battery voltage detection circuit safely reduces the high voltage of the battery to an acceptable input range of the MCU through the resistor voltage division principle; The full-wave rectifier voltage acquisition circuit adopts the AMC1200BDWVR chip to accurately acquire the DC voltage up to 350V output by the subsequent full-wave rectifier circuit; the voltage signal acquired by the AMC1200BDWVR chip is sent to the microcontroller for digital processing after signal conditioning.

4. The multifunctional intelligent mobile power supply device according to claim 1, characterized in that: The frequency conversion part also includes a control circuit, which includes a microcontroller. The microcontroller integrates multiple key sub-circuits, including a 5V to 3.3V power conversion circuit, a download debugging circuit, a crystal oscillator clock circuit, a filter stabilization circuit, and a reset protection circuit; the microcontroller outputs key PWM control signals, which directly drive the MOS tube switches in the full-bridge circuit to achieve efficient conversion of electrical energy; at the same time, the microcontroller also manages the activation and release of the short-circuit protection circuit by controlling the LATCH signal; the MOS_EN signal is also controlled by the microcontroller to enable or disable the MOS tube drive circuit.

5. The multifunctional intelligent mobile power supply device according to claim 1, characterized in that: The full-wave rectifier part receives various forms of AC voltage output from the pre-amplifier circuit as input; the full-wave rectifier circuit is also used to convert these AC voltages into stable DC voltages; after the conversion is completed, DC voltages of various specifications such as DC 220V, DC110V, DC 48V, DC 24V, and DC 12V are output through the preset output interface to meet the power supply requirements of different devices and circuits.

6. The multifunctional intelligent mobile power supply device according to claim 3, characterized in that: The full-wave rectifier section integrates the P4 connection point, allowing this high voltage to be directly connected to the full-wave rectifier voltage acquisition circuit for real-time monitoring and verification of the JP26 interface output voltage.

7. The multifunctional intelligent mobile power supply device according to claim 1, characterized in that: The inverter part includes a power circuit, a filter circuit, and a main control part; The power circuit is used to convert the input DC voltage into a voltage signal in the form of sinusoidal pulse width modulation (SPWM); The filter circuit is used to filter the processed SPWM voltage signal; The main control part gathers key data from various parts and performs processing and decision-making.

8. The multifunctional intelligent mobile power supply device according to claim 7, characterized in that: The core of the power circuit is an H-bridge structure, the main body of which is composed of four key IGBT transistors; the H-bridge receives a DC voltage of up to 350V as input from the interface of the full-wave rectifier part. After receiving this input, the H-bridge converts the input DC voltage into a voltage signal in the form of sinusoidal pulse width modulation (SPWM) by precisely controlling the switching state of the IGBT transistor; the SPWM voltage signal processed by the H-bridge is filtered through a filtering circuit.

9. The multifunctional intelligent mobile power supply device according to claim 7, characterized in that: The power circuit also includes an auxiliary circuit, which includes a current measurement auxiliary circuit, a voltage measurement auxiliary circuit, a short-circuit protection circuit, and a main control circuit; The current measurement auxiliary circuit adopts CC6900SO chip; The voltage measurement auxiliary circuit adopts the AMC1200 chip; The short-circuit protection circuit responds quickly when a short-circuit fault is detected, and protects the system from damage by cutting off the relevant circuit or adjusting the working state; The main control circuit includes multiple key sub-circuits, including a crystal oscillator circuit, a filter circuit, and a buck circuit; the crystal oscillator circuit provides an accurate clock signal for the MCU; the filter circuit is responsible for removing high-frequency noise and interference on the power line and signal line; the buck circuit converts the 5V voltage provided by the main control board into 3.3V through the AMS1117 chip.

10. The multifunctional intelligent mobile power supply device according to claim 7, characterized in that: The filtering circuit effectively filters out the high-frequency harmonic components in the original SPWM waveform, thereby restoring a pure 220V sinusoidal voltage; the main control part gathers key data such as voltage and current from various parts, and processes and makes decisions. It not only integrates the basic circuits to ensure the normal operation of the microcontroller MCU, including crystal oscillator circuit, download circuit, reset circuit and filtering circuit; it is also responsible for receiving and processing real-time voltage and current signals from other parts.

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