DC / DC conversion power supply with three-proof and anti-vibration characteristics

Abstract

The application belongs to the technical field of DC / DC conversion power supply, and particularly relates to a DC / DC conversion power supply with three-proof and anti-vibration characteristics, a GD32F103C8T6 single-chip microcomputer, an auxiliary power supply circuit, a main circuit, a module switch circuit, a constant-current charging circuit, a battery power monitoring circuit, a battery switch signal circuit, a communication and debugging circuit and an indicator lamp circuit; the auxiliary power supply circuit supplies power for the single-chip microcomputer and various control and monitoring circuits, the main circuit is connected with the MODEL_ON pin of the single-chip microcomputer through the module switch circuit, the constant-current charging circuit is controlled by the single-chip microcomputer, the signal output end of the battery power monitoring circuit is connected with the ADC pin of the single-chip microcomputer, the battery switch signal circuit is connected with the BAT_ON / OFF and MAIN_ON / OFF pins of the single-chip microcomputer, the communication and debugging circuit is connected with the USART and debugging pins of the single-chip microcomputer, the indicator lamp circuit is connected with the IO pin of the single-chip microcomputer, and the whole power supply is packaged by using a three-proof coating and an anti-vibration reinforcing structure.

Description

Technical Field

[0001] This invention belongs to the field of DC / DC power conversion technology, and particularly relates to a DC / DC power conversion with three-proof and vibration-resistant characteristics. Background Technology

[0002] Traditional DC / DC converters generally only perform basic voltage conversion functions. In harsh application scenarios such as industrial, automotive, and outdoor environments, they generally lack the ability to withstand moisture, salt spray, and corrosion. At the same time, their vibration resistance is weak, and under the mechanical stress of vibration, impact, etc., they are prone to problems such as loosening of components and failure of circuit connections, and cannot meet the requirements for stable operation in harsh environments.

[0003] Most existing DC / DC power supply products use a single power input path, with battery charging and discharging management and power on / off control being independent of each other. The battery status monitoring accuracy is insufficient, the protection mechanism is imperfect, and the coordination between the control unit and the power circuit is poor. It is difficult to balance high-efficiency conversion, intelligent battery management, and adaptability to harsh environments, which limits their application and promotion in complex working conditions. Summary of the Invention

[0004] In view of the aforementioned problems, and in conjunction with the first aspect of the present invention, the present invention provides a DC / DC converter power supply with tri-proof and vibration-resistant characteristics, including a GD32F103C8T6 microcontroller, an auxiliary power supply circuit, a main circuit, a module switch circuit, a constant current charging circuit, a battery power monitoring circuit, a battery switch signal circuit, a communication and debugging circuit, and an indicator light circuit; the auxiliary power supply circuit supplies power to the microcontroller and various control and monitoring circuits; the main circuit is connected to the MODEL_ON pin of the microcontroller through the module switch circuit; the constant current charging circuit is controlled by the microcontroller; the signal output terminal of the battery power monitoring circuit is connected to the ADC pin of the microcontroller; the battery switch signal circuit is connected to the BAT_ON / OFF and MAIN_ON / OFF pins of the microcontroller; the communication and debugging circuit is connected to the USART and debugging pins of the microcontroller; the indicator light circuit is connected to the IO pins of the microcontroller; and the power supply as a whole is packaged with a tri-proof coating and a vibration-resistant reinforced structure.

[0005] Preferably, the GD32F103C8T6 microcontroller is equipped with a minimum system circuit, including a 3.3V power supply circuit, decoupling capacitors, power-on reset circuit, 8MHz system crystal oscillator circuit, 32.768kHz RTC crystal oscillator circuit, BOOT startup configuration circuit, and SWD debugging interface circuit.

[0006] Preferably, the main circuit includes a 72V / 40A fuse, a 60V / 100A power MOSFET, and driving resistors and capacitors, which is the main power supply path and is controlled by the module switching circuit to achieve on / off control.

[0007] Preferably, the battery switch signal circuit is a dual-channel voltage comparison and detection unit, with an LM2904 dual operational amplifier as the core. It sets the voltage threshold through a voltage divider network and outputs two battery status detection signals, ViBatsignallow and ViBatsignalhigh, to the microcontroller.

[0008] Preferably, the main circuit includes a main input path and a battery input path, both of which use PMOS transistors as switching transistors and are controlled by MAIN_ON / OFF and BAT_ON / OFF signals respectively. It is also equipped with anti-reverse diodes and overcurrent fuses.

[0009] Preferably, the battery power monitoring circuit includes a battery full charge detection sub-circuit, which uses an LM2904 operational amplifier as its core, collects the CHARGE signal through a voltage divider and filter circuit, compares it with the reference voltage, and outputs the BAT_FULL signal to the microcontroller.

[0010] Preferably, the communication and debugging circuit includes a USART serial communication circuit, a TTL download circuit, and a BOOT selection circuit to realize program download, parameter configuration, and status data upload.

[0011] Preferably, the indicator light circuit includes an AO3400 driver transistor and red and green LEDs, which are directly driven by the microcontroller's I / O port to indicate the system's working, charging, and fault status.

[0012] Preferably, the three-proof coating is a full-coverage insulating, moisture-proof, and corrosion-resistant coating, and the vibration-resistant reinforcement structure includes component reinforcement adhesive and circuit board vibration-resistant fixing bracket.

[0013] Preferably, the output terminals of the dual power paths are all connected to a filter network composed of multiple electrolytic capacitors and CBB capacitors to smooth the output ripple and stabilize the output voltage.

[0014] Based on the above, this invention employs a full-coverage three-proof coating combined with component reinforcing adhesive and shock-resistant mounting brackets to improve the power supply's environmental adaptability from both circuit protection and structural reinforcement perspectives. It effectively resists moisture, salt spray, corrosion, vibration, and impact stress, preventing component loosening, short circuits, and corrosion failure, significantly improving the power supply's operational stability and lifespan under harsh conditions. Using a GD32F103C8T6 microcontroller, it achieves end-to-end intelligent control, enabling independent switching between dual power paths, precise battery status monitoring, and autonomous constant current charging and discharging management. Combined with overcurrent protection, reverse connection protection, and multi-level filtering protection, the power supply output ripple is smaller and the voltage more stable. It also features real-time status indication and convenient communication and debugging capabilities, balancing high protection, strong vibration resistance, and efficient intelligent control, making it suitable for demanding applications such as complex industrial and automotive applications. Attached Figure Description

[0015] Figure 1 This is a chip circuit diagram of a DC / DC converter power supply with three-proof and vibration-resistant characteristics provided in an embodiment of the present invention; Figure 2 This invention provides a battery switching signal circuit for a DC / DC converter power supply with three-proof and vibration-resistant characteristics. Figure 3 This invention provides a main circuit for a DC / DC converter power supply with three-proof and vibration-resistant characteristics. Figure 4 This invention provides a battery circuit detection circuit for a DC / DC converter power supply with three-proof and vibration-resistant characteristics. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings. Figure 1 This is a schematic flowchart of a DC / DC converter power supply with three-proof and vibration-resistant characteristics provided in one embodiment of the present invention. The following is a detailed description of this DC / DC converter power supply with three-proof and vibration-resistant characteristics.

[0017] This invention uses a GD32F103C8T6 microcontroller as the core control unit. An auxiliary power supply circuit provides stable low-voltage power to the microcontroller and various control and monitoring circuits. The main circuit, serving as the main power path, uses a module switching circuit to drive a power MOSFET based on the MODEL_ON signal output by the microcontroller to achieve on / off control. A constant current charging circuit, under the control of the microcontroller, charges the battery with a constant current. A battery power monitoring circuit collects battery voltage, current, and other parameters in real time and transmits them to the microcontroller's ADC pin, providing data support for charging management and overvoltage, undervoltage, and overcurrent protection. A battery switch signal circuit receives microcontroller commands to control BAT_ON / OFF and MAIN_ON / OFF to switch the battery side and main output on / off. A communication and debugging circuit completes program download, parameter configuration, and status reporting through USART and TTL interfaces. An indicator light circuit is directly driven by the microcontroller to display the system's operating status. After power-on, the microcontroller initializes and, combined with battery monitoring data, uniformly schedules charging, power on / off, and protection logic to achieve stable and coordinated operation of the entire system.

[0018] like Figure 1As shown, the chip circuit includes the GD32F103C8T6 microcontroller circuit, which is powered by 3.3V. The VDD pin is connected to the 3.3V power supply, and decoupling capacitors C2~C5 filter out power supply noise to ensure stable power supply. The reset circuit consists of R4 and C10, C11, which realizes the power-on reset function, so that the microcontroller enters the initial state when powered on. The 8MHz crystal oscillator Y1, together with the PD0 and PD1 pins, provides the system clock for the microcontroller, and the 32.768kHz crystal oscillator Y2, together with the PC14 and PC15 pins, provides the clock source for the RTC real-time clock module. The BOOT0 and BOOT1 pins configure the startup mode of the microcontroller, and the PA13 and PA14 pins serve as the SWD debugging interface, supporting program download and online debugging. The microcontroller's PA0~PA7 ADC channel pins collect Vi Bat signal low and Vi Batsignal. Battery-related signals such as high and BAT_FULL are displayed. The USART1_TX and USART1_RX pins implement serial communication functions. The PB0 pin outputs the MODEL_ON control signal, and the PB4 and PB5 pins output the BAT_ON / OFF and MAIN_ON / OFF control signals. The PB9, PB10, and PB11 pins drive the LED1_R, LED1_G, LED2_R, and LED2_G indicator lights. After power-on, the microcontroller starts running with the support of a stable power supply, clock, and reset circuit. It completes signal acquisition, control output, communication, and debugging functions through various peripheral pins.

[0019] like Figure 2As shown, the battery switch signal circuit includes a dual-channel voltage comparison and detection unit, with an LM2904 dual operational amplifier as its core. In the left unit, the 5V power supply is divided by R17 and R18 to provide a fixed reference voltage for the non-inverting input of U2A. The input signal Vi CHECK is divided by R19 and R20 and then sent to the inverting input of U2A. C18 and C19 filter the signal to suppress interference. The operational amplifier output signal is filtered by R21, R22 and C20 and then drives the N-channel MOSFET Q5, outputting the Vi Bat signal low. In the right unit, the 5V power supply is divided by R25 and R26 to provide a fixed reference voltage for the inverting input of U2B. The input signal ViCHECK is divided by R23 and R24 and then sent to the non-inverting input of U2B. C21 and C22 filter the signal to suppress interference. The operational amplifier output signal is filtered by R27, R28 and C23 and then drives the N-channel MOSFET Q6, outputting the Vi Bat signal low. The high signal is used by two units with different voltage divider networks to set different comparison thresholds. The input ViCHECK voltage signal is compared with the corresponding threshold. The operational amplifier outputs high and low levels according to the comparison result, controlling the conduction and cutoff of the MOSFET. Finally, two detection signals representing the battery voltage state are generated, providing the threshold judgment basis for the subsequent microcontroller circuit. The capacitors of each node effectively filter out noise in the signal and ensure the stability of the circuit operation.

[0020] like Figure 3 As shown, this circuit is a power supply circuit with a main path and a battery path. The Vi+ input, after interference is filtered by fuse F1 and common-mode filter capacitors CY1 and CY2, goes through a rectifier circuit composed of D1 and D2 to generate AUX POWER to power the control circuit. The other path enters the main path switching circuit, composed of main power PMOS transistor Q3, gate resistors R31 / R32, and driver transistor Q4 controlled by the MAIN_ON / OFF signal. When the MAIN_ON / OFF signal is valid, Q4 conducts and pulls low the gate of Q3, causing PMOS transistor Q3 to conduct. The current passes through anti-reverse diode D3, and after the ripple is smoothed and the voltage is stabilized by a filter network composed of multiple 220uF electrolytic capacitors and capacitor CBB1, it is output from Vo+. Simultaneously, the VBAT+ battery terminal, after passing through fuse F2, enters the main path switching circuit via battery path Q1. The battery path switching circuit consists of a PMOS transistor, gate resistors R1 / R2, and a driver transistor Q2 controlled by the BAT_ON / OFF signal. When the BAT_ON / OFF signal is valid, Q2 turns on and pulls down the gate of Q1, causing the PMOS transistor Q1 to turn on. The current flows into Vo+ after passing through the anti-reverse diode D4, realizing controllable power supply for the main input and battery input. D3 and D4 prevent reverse current flow, F1 and F2 provide overcurrent protection, and the filter network suppresses output ripple. The entire circuit achieves orderly switching between the main path and the battery path through control signals, ensuring stable and safe power supply.

[0021] like Figure 4 As shown, this circuit is a battery power monitoring circuit. The CHARGE signal is divided by R43 and R44 and filtered by C25 before being sent to the inverting input of the LM2904 operational amplifier. The 5V power supply is divided by R45 and R46 to obtain a fixed reference voltage, and then filtered by C24 before being sent to the non-inverting input of the operational amplifier. The operational amplifier compares the two voltages, and the output signal is current-limited by R47, pulled down by R48, and filtered by C26 before driving the transistor Q11, controlling its conduction and turn-off. Finally, the BAT_FULL signal is output to indicate whether the battery is fully charged. The capacitor effectively filters out signal noise, ensuring stable and reliable detection.

[0022] It should be noted that, in order to simplify the description of the present invention and thus help to understand one or more embodiments of the invention, multiple features may sometimes be grouped into one embodiment, drawing or description thereof in the foregoing description of the embodiments of the present invention.

[0023] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A DC / DC converter with three-proof and vibration-resistant characteristics, characterized in that: The system includes a GD32F103C8T6 microcontroller, an auxiliary power supply circuit, a main circuit, a module switch circuit, a constant current charging circuit, a battery power monitoring circuit, a battery switch signal circuit, a communication and debugging circuit, and an indicator light circuit. The auxiliary power supply circuit supplies power to the microcontroller and various control and monitoring circuits. The main circuit is connected to the MODEL_ON pin of the microcontroller through the module switch circuit. The constant current charging circuit is controlled by the microcontroller. The signal output terminal of the battery power monitoring circuit is connected to the ADC pin of the microcontroller. The battery switch signal circuit is connected to the BAT_ON / OFF and MAIN_ON / OFF pins of the microcontroller. The communication and debugging circuit is connected to the USART and debug pins of the microcontroller. The indicator light circuit is connected to the IO pins of the microcontroller. The entire power supply is encapsulated with a three-proof coating and a vibration-resistant reinforced structure.

2. The DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The GD32F103C8T6 microcontroller is equipped with a minimum system circuit, including a 3.3V power supply circuit, decoupling capacitors, power-on reset circuit, 8MHz system crystal oscillator circuit, 32.768kHz RTC crystal oscillator circuit, BOOT startup configuration circuit, and SWD debugging interface circuit.

3. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The main circuit includes a 72V / 40A fuse, a 60V / 100A power MOSFET, and driving resistors and capacitors, which is the main power supply path and is controlled by the module switching circuit to achieve on / off control.

4. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The battery switch signal circuit is a dual-channel voltage comparison and detection unit, with the LM2904 dual operational amplifier as its core. It sets the voltage threshold through a voltage divider network and outputs two battery status detection signals, ViBatsignallow and ViBatsignalhigh, to the microcontroller.

5. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The main circuit includes a main input path and a battery input path, both of which use PMOS transistors as switching transistors. The switching on and off is controlled by MAIN_ON / OFF and BAT_ON / OFF signals, respectively, and is equipped with anti-reverse diodes and overcurrent fuses.

6. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The battery power monitoring circuit includes a battery full charge detection sub-circuit, which uses an LM2904 operational amplifier as its core. It acquires the CHARGE signal through a voltage divider and filter circuit, compares it with the reference voltage, and outputs the BAT_FULL signal to the microcontroller.

7. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The communication and debugging circuit includes a USART serial communication circuit, a TTL download circuit, and a BOOT selection circuit, which enables program download, parameter configuration, and status data upload.

8. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The indicator light circuit includes an AO3400 driver transistor and red and green LEDs, which are directly driven by the microcontroller's I / O port and are used to indicate the system's working, charging, and fault status.

9. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 1, characterized in that: The three-proof coating is a full-coverage insulating, moisture-proof, and corrosion-resistant coating, and the vibration-resistant reinforcement structure includes component reinforcement adhesive and circuit board vibration-resistant fixing bracket.

10. A DC / DC converter with three-proof and vibration-resistant characteristics according to claim 5, characterized in that: The output terminals of the dual power paths are all connected to a filter network composed of multiple electrolytic capacitors and CBB capacitors to smooth output ripple and stabilize output voltage.

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