DCDC converter and vehicle with same

Abstract

The invention provides a DCDC converter and a vehicle with the same. The DCDC converter comprises a temperature sensing unit, a control unit, an MCU single-chip microcomputer and a signal conditioning unit. The control unit is electrically connected with the temperature sensing unit and the moving direction full-bridge unit, a first temperature compensation model is arranged in the control unit, and the control unit is used for controlling and adjusting working parameters of the moving direction full-bridge unit according to temperature signals of the temperature sensing unit; a second temperature compensation model is arranged in the MCU single chip microcomputer, and the MCU single chip microcomputer is used for generating a temperature compensation signal according to the temperature signal of the temperature sensing unit; the signal conditioning unit is electrically connected with the MCU single-chip microcomputer. The signal conditioning unit is used for adjusting internal parameters of the signal conditioning unit according to the temperature compensation signal so as to control the output voltage. By adopting the scheme, the problem of low control precision of the DCDC converter in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a DCDC converter and a vehicle having the same. Background Art

[0002] At present, with the rapid development of the new energy vehicle industry, higher requirements are placed on key electronic components in the vehicle-mounted high-voltage electrical platform. The DC / DC converter is the core component between the high-voltage system and the low-voltage system of new energy vehicles. Its function is to convert high-voltage DC voltage into low-voltage DC voltage to supply the low-voltage electrical system, thereby achieving electrical isolation between the high-voltage electrical system and the low-voltage electrical system. The conversion efficiency, voltage adaptation range, control accuracy and other performance of the DC / DC converter are crucial to the performance of new energy vehicles.

[0003] The control technology of DC / DC converter is a key link in the development of DC / DC converter. In order to meet different load requirements, the control strategy of existing DC / DC converters generally adopts fundamental wave control algorithm and two-phase modulation algorithm. Among them, the fundamental wave control algorithm maintains constant voltage output by changing the duty cycle, but the control accuracy of this control method is low, and the stability and accuracy of the output voltage are poor. The two-phase modulation algorithm can improve the control accuracy to a certain extent, but when the input voltage fluctuates or the load changes greatly, the control accuracy still cannot meet the requirements.

[0004] In terms of control accuracy, existing DC / DC converters generally use PID control algorithms or fuzzy control algorithms. The PID control algorithm is simple to control, but has poor anti-interference ability and limited control accuracy. The fuzzy control algorithm achieves real-time control through fuzzy logic, has good robustness and anti-interference ability, but the algorithm complexity is high, and the control accuracy is limited by the setting of fuzzy rules and fuzzy language values.

[0005] To address the above problems, no effective solution has been proposed yet. Summary of the invention

[0006] The main purpose of the present invention is to provide a DCDC converter and a vehicle having the same, so as to solve the problem of low control accuracy of the DCDC converter in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a DCDC converter is provided, comprising: a temperature sensing unit, the temperature sensing unit is arranged in at least one heat-sensitive area in the DCDC converter; a control unit, the control unit is electrically connected to the temperature sensing unit, the control unit is electrically connected to the shift full-bridge unit in the DCDC converter, the control unit has a first temperature compensation model built in, the control unit is used to control and adjust the working parameters of the shift full-bridge unit according to the temperature signal of the temperature sensing unit, the working parameters at least include the duty cycle and the switching frequency of the element; an MCU single-chip computer, the MCU single-chip computer is electrically connected to the temperature sensing unit, the MCU single-chip computer has a second temperature compensation model built in, the MCU single-chip computer is used to generate a temperature compensation signal according to the temperature signal of the temperature sensing unit, and the MCU single-chip computer has a communication unit for communicating with a host computer; a signal conditioning unit, the signal conditioning unit is electrically connected to the MCU single-chip computer, and the signal conditioning unit is used to adjust the internal parameters of the signal conditioning unit according to the temperature compensation signal to control the output voltage.

[0008] Furthermore, the temperature signal is an analog signal, and at least one of the control unit and the MCU microcontroller includes an analog-to-digital converter, and the analog-to-digital converter is used to convert the temperature signal into a digital signal.

[0009] Furthermore, the control unit is built with a temperature protection judgment module, which is used to generate a target instruction when the temperature signal of the temperature sensing unit meets a preset condition, and the target instruction is used to control at least one working module in the DCDC converter to shut down.

[0010] Furthermore, an OTA upgrade module is provided inside the MCU microcontroller, the OTA upgrade module is electrically connected to the communication unit, and the OTA upgrade module is used to communicate with the host computer to adjust and update the parameters of the second temperature compensation model.

[0011] Furthermore, the temperature sensing unit is at least one of a thermocouple, a thermistor, and an integrated temperature sensor.

[0012] Furthermore, the DCDC converter also includes a filter group and a Boost circuit. The filter group is electrically connected to an external battery, the input end of the Boost circuit is electrically connected to the filter group, the output end of the Boost circuit is electrically connected to the shift full-bridge unit, and the filter group and the Boost circuit are both electrically connected to the control unit.

[0013] Furthermore, the DCDC converter further comprises a transformer unit and a synchronous rectification unit, wherein the input end of the transformer unit is electrically connected to the output end of the shifted full-bridge unit, and the synchronous rectification unit is electrically connected to the output end of the transformer unit.

[0014] Furthermore, the DCDC converter also includes a voltage stabilization calculation module, a voltage adjustment module, and a driving unit. The voltage stabilization calculation module is electrically connected to the synchronous rectification unit, the voltage stabilization calculation module is electrically connected to the voltage adjustment module, the voltage adjustment module is electrically connected to the control unit, and the voltage adjustment module is electrically connected to the driving unit. The driving unit is used to control the working state of the power switch tube of the DCDC converter. The voltage stabilization calculation module calculates the difference between the target load and the current load and controls the voltage adjustment module based on the difference.

[0015] Furthermore, the DCDC converter also includes a CAN signal unit, and the CAN signal unit is electrically connected to the control unit.

[0016] According to another aspect of the present invention, a vehicle is provided, comprising a DCDC converter, wherein the DCDC converter is the above-mentioned DCDC converter.

[0017] By applying the technical solution of the present invention, the temperature of the heat-sensitive area is monitored in real time through the temperature sensing unit, and the two-stage temperature compensation mechanism of the control unit and the MCU single-chip microcomputer is used to dynamically adjust the working parameters (such as duty cycle, switching frequency) of the phase-shifted full-bridge unit and the output voltage of the signal conditioning unit, thereby effectively improving the stability and efficiency of the DCDC converter in different temperature environments, and realizing more accurate parameter control and voltage output through the two-stage temperature compensation model, thereby enhancing the overall performance and reliability of the system and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A system block diagram of a first embodiment of a DCDC converter according to the present invention is shown;

[0020] Figure 2 A system block diagram of a second embodiment of a DCDC converter according to the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. Filter bank;

[0023] 2. Boost circuit;

[0024] 3. Move to full-bridge unit;

[0025] 4. Transformer unit;

[0026] 5. Synchronous rectification unit;

[0027] 6. Voltage stabilization calculation module;

[0028] 7. Power management part;

[0029] 8. Signal diagnosis part;

[0030] 9. CAN signal unit;

[0031] 10. Control unit;

[0032] 11. Voltage adjustment module;

[0033] 12. Drive unit;

[0034] 13. Temperature sensing unit;

[0035] 14. MCU microcontroller;

[0036] 15. Signal conditioning unit. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0041] Combination Figure 1 to Figure 2 As shown, according to a specific embodiment of the present application, a DCDC converter and a vehicle having the same are provided.

[0042] Specifically, the DCDC converter includes: a temperature sensing unit 13 , a control unit 10 , an MCU 14 and a signal conditioning unit 15 .

[0043] The temperature sensing unit 13 is disposed in at least one heat-sensitive area in the DCDC converter;

[0044] The control unit 10 is electrically connected to the temperature sensing unit 13, and the control unit 10 is electrically connected to the shifting full-bridge unit 3 in the DCDC converter. The control unit 10 has a built-in first temperature compensation model. The control unit 10 is used to control and adjust the working parameters of the shifting full-bridge unit 3 according to the temperature signal of the temperature sensing unit 13, and the working parameters at least include the duty cycle and the switching frequency of the element;

[0045] The MCU single chip computer 14 is electrically connected to the temperature sensing unit 13. The MCU single chip computer 14 has a second temperature compensation model built in. The MCU single chip computer 14 is used to generate a temperature compensation signal according to the temperature signal of the temperature sensing unit 13. The MCU single chip computer 14 has a communication unit for communicating with a host computer.

[0046] The signal conditioning unit 15 is electrically connected to the MCU 14 , and is used to adjust internal parameters of the signal conditioning unit 15 according to the temperature compensation signal to control the output voltage.

[0047] By applying the technical solution of the present invention, the temperature of the heat-sensitive area is monitored in real time through the temperature sensing unit 13, and the two-stage temperature compensation mechanism of the control unit 10 and the MCU single-chip computer 14 is used to dynamically adjust the working parameters (such as duty cycle, switching frequency) of the full-bridge unit 3 and the output voltage of the signal conditioning unit 15, thereby effectively improving the stability and efficiency of the DCDC converter under different temperature environments, and realizing more accurate parameter control and voltage output through the two-stage temperature compensation model, thereby enhancing the overall performance and reliability of the system and extending the service life of the equipment.

[0048] It should be further explained that the control unit 10 has relatively limited storage capacity (mainly used to store and execute simple control logic), small computing power, and is more focused on real-time adjustment of the core components of the DCDC converter, while the MCU microcontroller 14 has relatively strong storage capacity and computing processing capabilities, which enables the MCU microcontroller 14 to dynamically adjust the control strategy according to real-time data, and is responsible for the digital processing of temperature signals, temperature-based decision logic, and communication with the host computer. The control unit 10 and the MCU microcontroller 14 work together to ensure that the DCDC converter can be adaptively adjusted in different temperature environments to maintain efficient and stable operation.

[0049] The MCU 14 has a communication unit for communicating with a host computer, and the modbus protocol may be used, which allows remote monitoring and control of the temperature compensation process.

[0050] The control unit 10 is used to control and adjust the working parameters of the full-bridge unit 3 according to the temperature signal of the temperature sensing unit 13. The working parameters include at least the duty cycle and the element switching frequency; the element switching frequency refers to the number of times the switching state of the switching element (such as MOSFET) in the DCDC converter changes within a unit time. The element switching frequency is an important parameter for measuring the working speed of the DCDC converter, usually in Hertz (Hz). The duty cycle refers to the ratio of the high voltage (on) time to the entire cycle time in a pulse cycle.

[0051] Specifically, the temperature signal is an analog signal, and at least one of the control unit 10 and the MCU microcontroller 14 includes an analog-to-digital converter, which is used to convert the temperature signal into a digital signal. The temperature of the heat-sensitive area detected by the temperature sensing unit is an analog signal, and the analog-to-digital converter is responsible for converting these continuously changing temperature signals into digital signals so that the MCU microcontroller 14 can understand and process them. The converted digital temperature signal is used for calculation by the second temperature compensation model of the MCU microcontroller 14 to generate a temperature compensation signal, ensuring that the DCDC converter can still maintain an efficient and stable working state under different temperature environments.

[0052] The analog-to-digital converter is an electronic device used to convert continuously changing analog signals into discrete digital signals. The core of the analog-to-digital converter is a 16-bit analog-to-digital conversion chip with high resolution up to 70μV and effective resolution up to 0.2mV, thus achieving high-precision voltage output.

[0053] In this embodiment, the data processed by the MCU single-chip computer 14 is input into the analog-to-digital converter for digital-to-analog conversion, and then input into the signal conditioning unit 15. The signal conditioning unit 15 can output different voltage values ​​by controlling its input voltage value to achieve precise control of the output voltage. The signal conditioning unit 15 works in conjunction with the MCU single-chip computer 14 to implement an accurate temperature compensation algorithm. The MCU single-chip computer 14 performs temperature compensation calculations based on the temperature signal of the temperature sensing unit 13, and the signal conditioning unit 15 adjusts the output voltage based on the calculation results. The cooperation between the two ensures the accuracy and effectiveness of temperature compensation.

[0054] The signal conditioning unit 15 usually includes components such as amplifiers and filters, which can improve the response speed and dynamic range of the system, so that the temperature compensation can quickly respond to temperature changes, adjust the output voltage in time, and reduce the impact of temperature on system performance. The signal conditioning unit 15 can also reduce signal fluctuations and noise and improve signal stability through designs such as negative feedback amplifier circuits. Temperature changes may introduce additional noise and interference, and the signal conditioning unit 15 can effectively suppress these interferences and ensure the accuracy of temperature compensation.

[0055] Furthermore, the control unit 10 is built with a temperature protection judgment module, which is used to generate a target instruction when the temperature signal of the temperature sensing unit 13 meets the preset conditions, and the target instruction is used to control at least one working module in the DCDC converter to shut down. The temperature sensing unit 13 usually includes a temperature sensor for monitoring the temperature of the DCDC converter. When the temperature is detected to be too high, the temperature protection judgment module generates a target instruction: control to reduce the output power or shut down the DCDC converter to prevent overheating damage. The temperature protection judgment module is a protection mechanism set by the control unit 10.

[0056] Specifically, an OTA upgrade module is provided inside the MCU single-chip computer 14, and the OTA upgrade module is electrically connected to the communication unit. The OTA upgrade module is used to communicate with the host computer to adjust and update the parameters of the second temperature compensation model. The host computer here can be a manufacturer's server, maintenance workstation or any remote control center. By setting an OTA upgrade module in the MCU single-chip computer 14, the parameters of the second temperature compensation model are adjusted and updated through the OTA upgrade module, which not only improves the temperature adaptability and control accuracy of the DCDC converter, but also enhances the maintainability and upgrade capabilities of the equipment, providing strong support for the long-term stable operation and function expansion of the equipment.

[0057] Through the OTA upgrade module, the host computer can remotely adjust the parameters of the second temperature compensation model. For example, the temperature threshold, compensation coefficient or algorithm logic can be adjusted to optimize the performance of the DCDC converter under specific temperature conditions. This remote parameter adjustment capability enables manufacturers or maintenance personnel to optimize the control strategy in real time based on field data in the actual operating environment of the equipment without physical access to the equipment.

[0058] In addition to parameter adjustment, the OTA upgrade module also supports the update of the second temperature compensation model. This means that the entire temperature compensation algorithm or model can be upgraded when necessary to incorporate new temperature compensation strategies, improved algorithms, or more accurate temperature data. This capability is particularly important for long-term operating devices because it can continuously improve the performance and reliability of the device to cope with environmental changes and the development of new technologies.

[0059] Specifically, the temperature sensing unit 13 is at least one of a thermocouple, a thermistor, and an integrated temperature sensor. The temperature sensing unit 13 can monitor the temperature of key parts inside the DCDC converter in real time. The temperature sensing unit 13 can be used as part of a fault diagnosis system to identify potential fault points early by monitoring abnormal temperature rise. In practical applications, different temperature sensing units 13, such as thermocouples, thermistors, or integrated temperature sensors, can be selected according to specific needs. Thermocouples are suitable for monitoring that requires high precision and high temperature environments; thermistors are suitable for monitoring in medium and low temperature ranges due to their low cost and fast response speed; integrated temperature sensors usually have digital outputs, which are convenient for direct communication with microcontrollers, and have high accuracy and stability.

[0060] Furthermore, the DCDC converter also includes a filter group 1 and a Boost circuit 2. The filter group 1 is electrically connected to an external battery, the input end of the Boost circuit 2 is electrically connected to the filter group 1, the output end of the Boost circuit 2 is electrically connected to the full-bridge unit 3, and the filter group 1 and the Boost circuit 2 are both electrically connected to the control unit 10.

[0061] The filter group 1 is electrically connected to the external battery, and its main function is to smooth and purify the input voltage. In practical applications, the voltage output by the battery may be subject to various interferences, such as grid noise, voltage fluctuations caused by load mutations, etc. The filter group 1 can filter out these interference signals and provide a more stable and pure DC power supply to the Boost circuit 2.

[0062] Boost circuit 2 is a step-up converter, which is used to increase the DC voltage output by filter group 1 to a higher voltage level in order to meet the voltage requirements of the full-bridge unit 3 and subsequent circuits. Since the input voltage range of the DCDC converter may be very wide, ranging from hundreds of volts to thousands of volts, and the full-bridge unit 3 requires a relatively fixed high-voltage input to ensure its conversion efficiency and output capacity. Boost circuit 2 can ensure that even when the battery voltage is low, the DCDC converter can provide sufficient voltage to the full-bridge unit 3, thereby achieving high power output of the entire system. In addition, Boost circuit 2 can also provide an isolated high-voltage power supply to power the internal circuit of the DCDC converter.

[0063] The shift-to-full-bridge unit 3 is mainly composed of a MOSFET full-bridge, which converts direct current into a high-frequency voltage square wave, and adjusts the subsequent voltage transformation ratio by changing the duty cycle of the square wave. If the duty cycle increases, it means that the switch conduction time increases, thereby increasing the average output voltage; conversely, if the duty cycle decreases, the average output voltage decreases. The duty cycle adjustment is usually implemented by the control unit 10, which calculates the appropriate duty cycle value and then generates a corresponding PWM signal to shift to the switch device in the full-bridge unit 3. By adjusting the duty cycle of the shift-to-full-bridge unit 3, precise control of the output voltage is achieved, thereby meeting the voltage requirements under different load conditions and improving the efficiency and adaptability of the converter.

[0064] The filter bank 1 and the boost circuit 2 are both electrically connected to the control unit 10, which means that the control unit 10 can monitor and control the working state of these circuits. The control unit 10 can adjust the control parameters of the boost circuit 2, such as the duty cycle of the pulse width modulation (PWM) signal, to ensure the stability and accuracy of the output voltage by receiving the voltage feedback of the filter bank 1. In addition, the control unit 10 can also adjust its operating parameters according to the working state of the boost circuit 2, such as overvoltage, overcurrent or overheating protection, to avoid damage or improve efficiency.

[0065] Furthermore, the DCDC converter further includes a transformer unit 4 and a synchronous rectification unit 5 . The input end of the transformer unit 4 is electrically connected to the output end of the full-bridge unit 3 , and the synchronous rectification unit 5 is electrically connected to the output end of the transformer unit 4 .

[0066] The main function of the transformer unit 4 is voltage conversion. It receives the high-frequency AC voltage outputted by the full-bridge unit 3, changes the voltage level through its internal coil ratio (turn ratio) and magnetic core, and converts the high-voltage AC voltage into a low-voltage AC voltage suitable for processing by the synchronous rectification unit 5. In addition, the transformer unit 4 also has the function of electrical isolation, which can prevent mutual interference between the input and output sides and improve the safety of the system.

[0067] The main task of the synchronous rectification unit 5 is to convert the low-voltage AC voltage output by the transformer unit 4 into a DC voltage. Different from the traditional diode rectification, the synchronous rectification unit 5 uses a switching rectifier (such as MOSFET) to reduce the energy loss in the rectification process and improve the overall efficiency of the converter. In addition, the synchronous rectification unit 5 also includes a filter capacitor for storing and releasing electrical energy, eliminating ripples in the output voltage, making it smoother, and ensuring that the final output DC voltage is stable and pure, suitable for use by downstream loads.

[0068] The synchronous rectification unit 5 is electrically connected to the output end of the transformer unit 4, that is, the series connection of the transformer unit 4 and the synchronous rectification unit 5 is the key to the DCDC converter to achieve voltage conversion and efficient rectification. The high-frequency AC power generated by the full-bridge unit 3 will output an AC voltage suitable for rectification after voltage conversion and electrical isolation by the transformer unit 4. Subsequently, the synchronous rectification unit 5 rectifies this AC voltage into a DC voltage, and reduces the AC component in the DC voltage through the internal filtering component, and finally outputs a pure and stable low-voltage DC power.

[0069] Furthermore, the DCDC converter also includes a voltage stabilization calculation module 6, a voltage adjustment module 11, and a drive unit 12. The voltage stabilization calculation module 6 is electrically connected to the synchronous rectification unit 5, the voltage stabilization calculation module 6 is electrically connected to the voltage adjustment module 11, the voltage adjustment module 11 is electrically connected to the control unit 10, and the voltage adjustment module 11 is electrically connected to the drive unit 12. The drive unit 12 is used to control the working state of the power switch tube of the DCDC converter. The voltage stabilization calculation module 6 calculates the difference between the target load and the current load and controls the voltage adjustment module 11 based on the difference.

[0070] The voltage stabilization calculation module 6 is mainly responsible for monitoring and adjusting the output voltage of the converter to ensure that it is stable at the voltage value required by the target load. It monitors the output voltage in real time through electrical connection with the synchronous rectification unit 5, compares it with the target value, calculates the voltage difference between the target load and the current load, and sends a signal to the voltage adjustment module 11. The voltage adjustment module 11 adjusts the output voltage according to the difference to ensure that it is stable at the target value. This process forms a fast-response closed-loop control system, which improves the stability and efficiency of the converter.

[0071] The connection between the voltage adjustment module 11 and the control unit 10 allows the control unit 10 to dynamically adjust the parameters of the voltage adjustment module 11, such as the switching frequency, by sending a control signal to cope with the instantaneous change of the load or the working mode of the system. The connection with the drive unit 12 ensures that the voltage adjustment module 11 can transmit the adjusted signal to the drive unit 12 in a timely and accurate manner, control the working state of the power switch tube, ensure the precise control of the power switch tube, improve the switching efficiency and reliability of the converter, and reduce the switching loss and electromagnetic interference.

[0072] The function of the driving unit 12 is to receive the signal from the voltage adjustment module 11 and convert it into the driving signal required by the power switch tube (such as MOSFET), control the on and off of the switch tube, and thus directly affect the power conversion process of the DCDC converter. It can quickly respond to the voltage adjustment instruction through the electrical connection with the voltage adjustment module 11 to ensure that the working state of the power switch tube matches the voltage adjustment strategy of the converter. At the same time, the driving unit 12 is also responsible for protecting the power switch tube to prevent it from being damaged by excessive current or voltage.

[0073] Furthermore, the DCDC converter further comprises a CAN signal unit 9, which is electrically connected to the control unit 10. The CAN signal unit 9 provides important communication capabilities for the DCDC converter, thereby realizing efficient and intelligent power management in modern vehicles or complex systems.

[0074] The CAN signal unit 9 is connected to the control unit 10, so that the DCDC converter can communicate with other electronic control units of the vehicle through the CAN bus. The control unit 10 can receive data from other parts of the vehicle through the CAN bus, such as the voltage, current and temperature information of the battery management part 7, and the demand information of the vehicle load. Based on this information, the control unit 10 can adjust the operating parameters of the DCDC converter, such as the output voltage and current, to ensure that the DCDC converter can operate efficiently and safely under various conditions. The CAN signal unit 9 is also responsible for reporting the health status and fault information of the DCDC converter to the central control system of the vehicle, which helps the control system of the vehicle to perform fault diagnosis.

[0075] It needs to be further explained that if Figure 1As shown, the DCDC converter also includes a power management part 7 and a signal diagnosis part 8. The power management part 7 is electrically connected to the control unit 10 and the CAN signal unit 9. The power management part 7 is also responsible for supplying power to other circuit components in the converter (such as the drive unit 12, the signal diagnosis part 8, and the control unit 10). The signal diagnosis part 8 is electrically connected to the control unit 10. Once the signal diagnosis part 8 detects any abnormal situation, such as overvoltage, undervoltage, overcurrent, short circuit or overheating, it will immediately send an alarm signal through the electrical connection with the control unit 10. After receiving these alarm signals, the control unit 10 can take action immediately. The signal diagnosis part 8 is directly connected to the circuit of the DCDC converter and can monitor the signals moving to key nodes such as the full bridge unit 3, the Boost circuit 2, the transformer unit 4, the synchronous rectification unit 5 and the voltage stabilization calculation module 6. This connection is usually achieved through a sampling resistor, a voltage probe or a current probe to ensure that the operating status of the converter can be monitored in real time. The data transmission between the control unit 10 and the power management part 7 and the signal diagnosis part 8 is usually based on an internal communication bus.

[0076] The main steps of using the above DCDC converter to work are as follows: Figure 1 , Figure 2 As shown, the arrow direction in the figure represents the signal transmission direction. In this embodiment, the DCDC converter implements a double-stage temperature compensation mechanism through the control unit 10 and the MCU 14, thereby achieving precise control of the voltage.

[0077] The steps of implementing the DCDC converter voltage control by the control unit 10 are as follows:

[0078] 1. The voltage input from the high-voltage battery enters the filter group 1 for filtering, and then is boosted to a fixed value by the Boost circuit 2, and this fixed value is transmitted to the full-bridge unit 3;

[0079] 2. The high voltage signal is converted into a low voltage signal by the transformer unit 4 and transmitted to the synchronous rectification unit 5 for rectification;

[0080] The synchronous rectification unit 5 ensures that the rectification voltage is in phase with the gate voltage, thereby ensuring maximum conversion efficiency.

[0081] 3. When the load suddenly changes, the voltage stabilization calculation module 6 calculates the difference between the target load and the current load, and then the voltage adjustment module 11 adjusts the drive unit 12 to change the duty cycle of the voltage signal output to the full-bridge unit 3, and finally the low voltage can also be adjusted accordingly; the module filters out the DC signal to complete the conversion from high voltage to low voltage;

[0082] 4. By collecting analog quantities of the voltage and current at the rear end of the Boost circuit 2, the full-bridge unit 3, and the synchronous rectification unit 5 and inputting them to the signal diagnosis part 8 for diagnosis, the integrity of the signal in each link is ensured, and finally transmitted to the control unit 10;

[0083] 5. The control unit 10 controls the driving unit 12 to drive the MOSFETs in the Boost circuit 2, the full-bridge unit 3, and the synchronous rectification unit 5 to make them work normally;

[0084] 6. 24V power is input into the power management part 7, and the power management part 7 outputs low voltages of different sizes to power the control unit 10, MCU, CAN signal unit 9, and drive unit 12. At the same time, the control unit 10 controls the power management part 7 through the SPI signal; in addition, the CAN signal unit 9 can also wake up the power management part 7 through the CAN signal, power the entire DCDC converter, and enter the working mode;

[0085] 7. Finally, the CAN_H and CAN_L signals transmitted through the entire DCDC converter communicate with the control unit 10 in the DCDC via the CAN signal unit 9 to ensure the consistency of the entire converter.

[0086] The steps of implementing temperature compensation control of the DCDC converter by the MCU 14 to affect the output voltage are as follows:

[0087] 1. The temperature sensing unit 13 continuously monitors the temperature of key components inside the DCDC converter, such as power switch tubes, inductors, capacitors, etc.;

[0088] 2. The temperature signal monitored by the temperature sensing unit 13 is transmitted to the MCU 14 through electrical connection for processing;

[0089] 3. The MCU 14 has a built-in second temperature compensation model, which performs mathematical modeling based on the impact of temperature changes on circuit performance. When the MCU 14 receives the temperature signal, it uses the second temperature compensation model to calculate the impact of temperature changes on the converter output voltage and generates a corresponding temperature compensation signal;

[0090] 4. The MCU 14 sends the generated temperature compensation signal to the signal conditioning unit 15 through an electrical connection. After receiving the temperature compensation signal, the signal conditioning unit 15 adjusts its internal parameters according to the signal content to compensate for the impact of temperature changes on the output voltage;

[0091] 5. The MCU 14 also has a communication unit for communicating with the host computer. It can send temperature data, compensation parameters and converter status to the host computer through the modbus communication protocol, and receive commands and set values ​​from the host computer to achieve remote monitoring and control.

[0092] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0093] 1. The temperature of the heat-sensitive area is monitored in real time through the temperature sensing unit. The dual-stage temperature compensation mechanism of the control unit and the MCU is used to dynamically adjust the working parameters of the phase-shifted full-bridge unit (such as duty cycle, switching frequency) and the output voltage of the signal conditioning unit, which effectively improves the stability and efficiency of the DCDC converter under different temperature environments. The dual-stage temperature compensation model realizes more accurate parameter control and voltage output, enhances the overall performance and reliability of the system, and extends the service life of the equipment.

[0094] 2. The intelligent control and remote monitoring functions of the DCDC converter are realized through the communication between the MCU and the host computer. The MCU can adjust the working parameters of the signal conditioning unit according to real-time data. At the same time, through data exchange with the host computer, the central control system of the vehicle can obtain the status information of the DCDC converter in real time, and perform fault diagnosis and preventive maintenance.

[0095] The above embodiments may also be used in the field of equipment technology. That is, according to another aspect of the present invention, a vehicle is provided, including a DCDC converter. The DCDC converter is the DCDC converter described in the above embodiments.

[0096] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0097] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0098] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A DCDC converter, characterized in that: include: A temperature sensing unit (13), wherein the temperature sensing unit (13) is arranged in at least one heat-sensitive area in the DCDC converter; A control unit (10), the control unit (10) being electrically connected to the temperature sensing unit (13), the control unit (10) being electrically connected to the shifting full-bridge unit (3) in the DCDC converter, the control unit (10) being built with a first temperature compensation model, the control unit (10) being used to control and adjust the operating parameters of the shifting full-bridge unit (3) according to the temperature signal of the temperature sensing unit (13), the operating parameters at least including a duty cycle and a component switching frequency; An MCU single chip computer (14), the MCU single chip computer (14) being electrically connected to the temperature sensing unit (13), the MCU single chip computer (14) having a second temperature compensation model built therein, the MCU single chip computer (14) being used to generate a temperature compensation signal according to a temperature signal of the temperature sensing unit (13), and the MCU single chip computer (14) having a communication unit for communicating with a host computer; A signal conditioning unit (15), the signal conditioning unit (15) being electrically connected to the MCU single chip computer (14), the signal conditioning unit (15) being used to adjust internal parameters of the signal conditioning unit (15) according to the temperature compensation signal to control the output voltage.

2. The DCDC converter according to claim 1, characterized in that: The temperature signal is an analog signal, and at least one of the control unit (10) and the MCU (14) comprises an analog-to-digital converter, and the analog-to-digital converter is used to convert the temperature signal into a digital signal.

3. The DCDC converter according to claim 1, characterized in that: The control unit (10) is built with a temperature protection judgment module, which is used to generate a target instruction when the temperature signal of the temperature sensing unit (13) meets a preset condition, and the target instruction is used to control at least one working module in the DCDC converter to shut down.

4. The DCDC converter according to claim 1, characterized in that: An OTA upgrade module is arranged inside the MCU (14), the OTA upgrade module is electrically connected to the communication unit, and the OTA upgrade module is used to communicate with the host computer to adjust and update the parameters of the second temperature compensation model.

5. The DCDC converter according to claim 1, characterized in that: The temperature sensing unit (13) is at least one of a thermocouple, a thermistor, and an integrated temperature sensor.

6. The DCDC converter according to claim 1, characterized in that: The DCDC converter further comprises a filter group (1) and a Boost circuit (2); the filter group (1) is electrically connected to an external battery; the input end of the Boost circuit (2) is electrically connected to the filter group (1); the output end of the Boost circuit (2) is electrically connected to the shifted full-bridge unit (3); and the filter group (1) and the Boost circuit (2) are both electrically connected to the control unit (10).

7. The DCDC converter according to claim 6, characterized in that: The DCDC converter further comprises a transformer unit (4) and a synchronous rectification unit (5); the input end of the transformer unit (4) is electrically connected to the output end of the shifted full-bridge unit (3); and the synchronous rectification unit (5) is electrically connected to the output end of the transformer unit (4).

8. The DCDC converter according to claim 7, characterized in that: The DCDC converter further comprises a voltage stabilization calculation module (6), a voltage adjustment module (11), and a drive unit (12); the voltage stabilization calculation module (6) is electrically connected to the synchronous rectification unit (5); the voltage stabilization calculation module (6) is electrically connected to the voltage adjustment module (11); the voltage adjustment module (11) is electrically connected to the control unit (10); the voltage adjustment module (11) is electrically connected to the drive unit (12); the drive unit (12) is used to control the working state of the power switch tube of the DCDC converter; the voltage stabilization calculation module (6) calculates the difference between the target load and the current load and controls the voltage adjustment module (11) based on the difference.

9. The DCDC converter according to claim 1, characterized in that: The DCDC converter further comprises a CAN signal unit (9), and the CAN signal unit (9) is electrically connected to the control unit (10).

10. A vehicle, comprising a DCDC converter, characterized in that: The DCDC converter is the DCDC converter according to any one of claims 1 to 9.

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