A DC-DC power supply short circuit protection circuit and a power management system provided with the same

Abstract

This invention provides a DC-DC power supply short-circuit protection circuit and a power management system thereof. By directly connecting the reset module to the processor's reset pin and continuously monitoring the output voltage of the LDO module supplying power to the processor, combined with the processor's control of the protection module's enable pin, a fast response mechanism for the DC-DC power supply protection circuit is achieved. Specifically, this invention utilizes the inherent hardware behavior of the processor's reset to trigger the protection action. The logic is simple and reliable, eliminating the need for complex software judgments and avoiding the risks of software crashes or response delays, thus improving the overall system robustness. Furthermore, once the short-circuit fault is cleared and the LDO output voltage returns to normal, the processor will automatically exit the reset state and reinitialize, achieving automatic system recovery and reducing manual intervention and equipment downtime.

Description

Technical Field

[0001] This utility model relates to the field of new energy integrated machines, and in particular to a DC-DC power supply short circuit protection circuit and a power management system equipped with it. Background Technology

[0002] In the field of integrated new energy power supplies, short-circuit protection of the DC-DC power conversion module, as the core module of the power management system, is crucial. In existing designs, a positive temperature coefficient thermistor (PTC) is typically introduced into the short-circuit protection circuit of the DC-DC power conversion module to cut off the power supply for protection. However, in practical applications, PTC protection still has some problems: First, PTC protection has a slow response speed. When a power short circuit suddenly occurs, it cannot immediately cut off the circuit. The short circuit current will continue to impact the circuit during the delay time, causing damage to other components and affecting the overall stability and reliability of the equipment. At the same time, after the fault is cleared, PTC reset takes a long time, which leads to delays in the operation of the equipment and reduces the availability of the system.

[0003] Secondly, the operation of PTC is very sensitive to temperature. At high temperatures, its resistance characteristics change, which may cause the protection point to change and fail to operate in time under the set short-circuit current. At low temperatures, problems such as difficulty in resetting may occur. In addition, PTC consumes a certain amount of power during normal operation, which reduces energy efficiency.

[0004] Therefore, it is necessary to design a DC-DC power supply short-circuit protection circuit with faster response speed, better temperature adaptability, and lower power consumption. Utility Model Content

[0005] The present invention aims to overcome at least one of the defects of the prior art mentioned above, and to provide a DC-DC power supply short circuit protection circuit and a power management system provided therewith.

[0006] Specifically, this technical solution provides a DC-DC power supply short-circuit protection circuit, including: DC-DC power module, used to provide DC power supply voltage; The protection module is connected in series to the output terminal of the DC-DC power module and has an enable terminal; The LDO module has its input terminal connected to the output terminal of the DC-DC power module and outputs low-voltage DC power from its output terminal. The processor has its power input connected to the output of the LDO module and at least one of its output pins connected to the enable pin of the protection module. A reset module is connected to the processor's power input terminal and reset pin; The reset module monitors the output voltage of the LDO module and outputs a reset signal to the reset pin of the processor when the voltage is lower than a preset threshold. After receiving the reset signal, the processor outputs a disconnect enable signal from its output pin to the enable terminal of the protection module, thereby controlling the protection module to disconnect.

[0007] In this technical solution, a fast response mechanism for the DC-DC power supply protection circuit is achieved by directly connecting the reset module to the processor's reset pin and continuously monitoring the output voltage of the LDO module that powers the processor. Combined with the processor's control of the protection module's enable pin, this mechanism enables the protection of the DC-DC power supply. Specifically, when a power short circuit causes the LDO module's output voltage to drop sharply below a preset threshold, the reset module immediately sends a reset signal to the processor. Upon receiving this reset signal and entering the reset state, the processor's output pin automatically sends a disconnect signal to the protection module's enable pin. This sensitive logic level control significantly improves the speed and reliability of short-circuit protection, enabling timely interruption of fault current and effectively preventing damage to the DC-DC power supply module and other circuit components from short-circuit current impact. By utilizing the inherent hardware behavior of the processor's reset to trigger the protection action, the logic is simple and reliable, eliminating the need for complex software judgments and avoiding the risks associated with software crashes or response delays, thus improving the overall system robustness. Furthermore, once the short-circuit fault is cleared and the LDO output voltage returns to normal, the processor automatically exits the reset state and reinitializes, achieving automatic system recovery and reducing manual intervention and equipment downtime.

[0008] Furthermore, the DC-DC power module includes a power conversion unit, the input terminal of which receives a DC input voltage, which is converted by the power conversion unit and outputs a DC power supply voltage.

[0009] In one embodiment, the power conversion unit employs a power management chip, the power input pin VIN of which is connected to the DC input voltage transmission point, and the power input pin VIN of the power management chip is also reliably grounded through parallel capacitors C44, C33, and C41; the ground pin GND of the power management chip is reliably grounded. The power management chip's switch pin PH and bootstrap pin BOOT are connected through a bootstrap capacitor C26, and the bootstrap pin BOOT of the power management chip is further connected to the DC input voltage transmission point through the bootstrap capacitor C26, a capacitor C42, and a resistor group R81. The bootstrap pin BOOT of the power management chip is further connected to a resistor group formed by the series connection of inductor L2, resistor R21, resistor R22 and series connection of resistor R29, resistor R23 through the bootstrap capacitor C26 and further grounded, and the output point of the DC power supply voltage is formed between the inductor L2 and the resistor R21. One end of the inductor L2 and the bootstrap capacitor C26 is also connected to a diode C4 and grounded; One end of the inductor L2 is also connected to a capacitor C29, a resistor group R24, and further grounded; The two ends of the inductor L2, which are connected to the output point of the DC power supply voltage, are also connected to capacitors C13, C14, and C16 in parallel and further grounded.

[0010] Furthermore, the protection module includes a switching unit and a protection unit, and the enable terminal is connected to the output terminal of the DC-DC power module through the protection unit; The switching unit uses a MOSFET, and the gate of the MOSFET is connected to the enable terminal through the protection unit. The source and drain of the MOSFET are respectively connected to the output terminal and the operating power terminal of the DC-DC power module. When the enable terminal of the protection module outputs a disconnect enable signal, the MOSFET is turned off, and the operating power supply terminal is disconnected from the output terminal of the DC-DC power supply module.

[0011] In this technical solution, by specifically designing the protection module as a combination of a switching unit and a protection unit, fast and reliable electronic switching control of the main power supply circuit is achieved. Specifically, a MOSFET is used as the core switching element, and its gate is driven by the processor's enable signal through the protection unit. When the processor issues a disconnect enable signal, the protection unit ensures that the signal effectively acts on the MOSFET gate, causing it to quickly enter the off state. This significantly improves the response speed and reliability of the circuit protection, and can completely cut off the current path from the DC-DC power module output to the subsequent operating power supply in a very short time, effectively preventing the continuous impact of short-circuit current and maximizing the safety of the power module and load circuit. At the same time, the MOSFET has low on-resistance in the conducting state and low conduction loss during normal operation, which helps to reduce the overall power consumption of the system. Furthermore, the MOSFET is stable and reliable as a circuit switch, unaffected by changes in ambient temperature, ensuring the stability of the protection function under various operating conditions and its long-term reliability.

[0012] In one embodiment, the protection unit employs a Darlington transistor array device, with the input control terminal 1 of the Darlington transistor array device serving as the enable terminal WIFI-POWER-ON and grounded, and the output drive terminal 16 of the Darlington transistor array device connected to the output terminal of the DC-DC power module via a current-limiting resistor R44. The switching unit uses a P-type MOSFET. The gate 1 of the MOSFET is connected to the output drive terminal 16 of the Darlington transistor array device through a current-regulating resistor R48. The source 3 of the MOSFET is connected to the output terminal of the DC-DC power supply module. A voltage-regulating capacitor C39 is connected in parallel between the gate 1 and the source 3 of the MOSFET. The drain 2 of the MOSFET is connected to the working power supply terminal.

[0013] Furthermore, the LDO module converts the output voltage of the DC-DC power module into 3.3V DC power and supplies power to the processor.

[0014] In one embodiment, the LDO module includes at least an input terminal I, an output terminal O, and a ground terminal G. The input terminal I of the LDO module is connected to the output terminal of the DC-DC power supply module, the output terminal O of the LDO module is connected to the input terminal of the processor, and the ground terminal G of the LDO module is grounded. Furthermore, a voltage-stabilizing capacitor C2 is provided between the input terminal I and the ground terminal G of the LDO module; and a voltage-stabilizing capacitor C3 and a voltage-stabilizing capacitor C4 are provided in parallel between the output terminal O and the ground terminal G of the LDO module.

[0015] Furthermore, the reset module includes a reset unit, the input terminal of which is connected to the power input terminal of the processor and is used to receive the output voltage of the LDO module. The reset unit has a built-in voltage comparison unit for comparing the output voltage of the LDO module and outputting a reset signal from the output terminal of the reset unit to the reset pin of the processor.

[0016] Preferably, the detection threshold of the voltage comparison unit is set to 85%-95% of the nominal output voltage of the LDO module. The LDO module indirectly converts the output short-circuit fault into a drop in the processor power supply voltage. The reset unit then quickly detects this voltage change and triggers the processor to reset, thereby automatically driving the protection module to quickly disconnect the fault circuit. This achieves the comprehensive benefits of fast response, short reset time, high reliability, and low static power consumption, significantly improving the speed and reliability of short-circuit protection.

[0017] For example, when the LDO module converts the output voltage of the DC-DC power module to a nominal DC output voltage of 3.3V, the detection threshold of the voltage comparison unit is set to 3.08V. When the output voltage of the LDO module is lower than 3.08V, the output terminal of the reset unit outputs a reset signal to the reset pin of the processor to perform a reset operation.

[0018] In one embodiment, the reset unit uses a voltage monitoring chip. The input terminal VCC of the voltage monitoring chip receives the output voltage of the LDO module and outputs a reset signal to the reset pin of the processor through the output terminal RESET of the voltage monitoring chip. The ground terminal GND of the voltage monitoring chip is grounded. The input terminal VCC of the voltage monitoring chip is also connected to a voltage stabilizing capacitor C15 and further reliably grounded. A voltage stabilizing resistor R11, a voltage stabilizing capacitor C23, and a voltage stabilizing resistor R12 connected in parallel are also connected between the output terminal RESET of the voltage monitoring chip and the ground terminal GND of the voltage monitoring chip. The reset pin access point of the processor is located between the voltage stabilizing resistor R11 and the voltage stabilizing capacitor C23, and a pull-up resistor R15 is provided between the access point of the processor's reset pin and the voltage stabilizing resistor R11.

[0019] Another objective of this utility model is to provide a power management system, including a power conversion module, a power distribution and switching module, a power protection module and a control module, wherein the power conversion module is provided with a DC-DC power short-circuit protection circuit as provided in this technical solution.

[0020] The beneficial effects of this utility model are as follows: 1. A DC-DC power supply short-circuit protection circuit is provided. When a power short circuit causes the output voltage of the LDO module to drop sharply below a preset threshold, the reset module immediately sends a reset signal to the processor. After receiving this reset signal and entering the reset state, the processor's output pin automatically sends a disconnect signal to the enable terminal of the protection module. This significantly improves the speed and reliability of short-circuit protection through sensitive logic level control, enabling timely interruption of fault current and effectively preventing short-circuit current from impacting and damaging the DC-DC power supply module and other circuit components. By utilizing the inherent hardware behavior of processor reset to trigger the protection action, the logic is simple and reliable, eliminating the need for complex software judgments and avoiding the risks caused by software crashes or response delays, thus improving the overall system robustness. Furthermore, once the short-circuit fault is cleared and the LDO output voltage returns to normal, the processor will automatically exit the reset state and reinitialize, achieving automatic system recovery and reducing manual intervention and equipment downtime. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the DC-DC power supply short-circuit protection circuit provided by this utility model.

[0022] Figure 2 This is a circuit connection diagram of the DC-DC power module of the DC-DC power supply short-circuit protection circuit provided in Embodiment 2 of this utility model.

[0023] Figure 3 This is a circuit connection diagram of the protection module of the DC-DC power supply short circuit protection circuit provided in Embodiment 2 of this utility model.

[0024] Figure 4 This is a circuit connection diagram of the LDO module of the DC-DC power supply short-circuit protection circuit provided in Embodiment 2 of this utility model.

[0025] Figure 5 This is a circuit connection diagram of the reset module of the DC-DC power supply short-circuit protection circuit provided in Embodiment 2 of this utility model. Detailed Implementation

[0026] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] Example 1 like Figure 1 As shown, this embodiment provides a DC-DC power supply short-circuit protection circuit, including: DC-DC power module, used to provide DC power supply voltage; The protection module, connected in series to the output terminal of the DC-DC power module, has an enable terminal; The LDO module has its input connected to the output of the DC-DC power module and outputs low-voltage DC power from its output. The processor has its power input connected to the output of the LDO module and at least one of its output pins connected to the enable pin of the protection module. The reset module connects to the processor's power input and reset pin. The reset module monitors the output voltage of the LDO module and outputs a reset signal to the processor's reset pin when the voltage is lower than a preset threshold. After receiving the reset signal, the processor outputs a disconnect enable signal from its output pin to the enable terminal of the protection module, thereby controlling the protection module to disconnect.

[0028] Furthermore, the DC-DC power module includes a power conversion unit. The input terminal of the power conversion unit receives a DC input voltage, which is converted by the power conversion unit and outputs a DC power supply voltage.

[0029] Furthermore, the protection module includes a switching unit and a protection unit, with the enable terminal connected to the output terminal of the DC-DC power module through the protection unit; The switching unit uses MOSFETs, and the gate of the MOSFET is connected to the enable terminal through a protection unit. The source and drain of the MOSFET are connected to the output terminal and the operating power terminal of the DC-DC power module, respectively. When the enable signal of the protection module is disconnected, the MOSFET is turned off, and the working power supply terminal is disconnected from the output terminal of the DC-DC power supply module.

[0030] Furthermore, the LDO module converts the output voltage of the DC-DC power module to 3.3V DC and powers the processor.

[0031] Furthermore, the reset module includes a reset unit. The input terminal of the reset unit is connected to the power input terminal of the processor and is used to receive the output voltage of the LDO module. The reset unit has a built-in voltage comparison unit for comparing the output voltage of the LDO module and outputting a reset signal from the output terminal of the reset unit to the reset pin of the processor.

[0032] Preferably, the detection threshold of the voltage comparison unit is set to 85%-95% of the nominal output voltage of the LDO module. The LDO module indirectly converts the output short-circuit fault into a drop in the processor power supply voltage. The reset unit then quickly detects this voltage change and triggers the processor to reset, thereby automatically driving the protection module to quickly disconnect the fault circuit. This achieves the comprehensive benefits of fast response, short reset time, high reliability, and low static power consumption, significantly improving the speed and reliability of short-circuit protection.

[0033] Example 2 like Figures 1-5 As shown, this embodiment also provides a DC-DC power supply short-circuit protection circuit. The difference from embodiment 1 is that the power conversion unit uses a power management chip. The power input pin VIN of the power management chip is connected to the DC input voltage transmission point, and the power input pin VIN of the power management chip is also reliably grounded through parallel C44, capacitor C33 and capacitor C41; the ground pin GND of the power management chip is reliably grounded. The power management chip's switch pin PH and bootstrap pin BOOT are connected through bootstrap capacitor C26, and the bootstrap pin BOOT of the power management chip is further connected to the DC input voltage delivery point through bootstrap capacitor C26, capacitor C42, and resistor group R81 in series. The bootstrap pin of the power management chip is further connected to the series inductor L2, resistor R21, resistor R22 and series resistor R29, resistor R23 in parallel through bootstrap capacitor C26 to form a resistor group and further grounded, and a DC power supply voltage output point is formed between inductor L2 and resistor R21. One end of the inductor L2 and the bootstrap capacitor C26 is also connected to a diode C4 and grounded; One end of inductor L2 is also connected to capacitor C29, resistor group R24, and further grounded; The two terminals of inductor L2, which are connected to the output point of the DC power supply voltage, are also connected to capacitors C13, C14, and C16 in parallel and further grounded.

[0034] In this embodiment, the performance and reliability of the power conversion unit are significantly improved by designing a sophisticated input filtering, bootstrap driving, and output voltage regulation circuit structure for the power management chip. Specifically, multiple filter capacitors (C44, C33, C41) are connected in parallel at the power input pin VIN to effectively filter out high-frequency noise and voltage fluctuations in the input DC voltage, providing a stable operating power supply for the chip. At the same time, the bootstrap circuit design (the BOOT pin is connected to the switch pin PH through the bootstrap capacitor C26, and then connected to the input voltage and ground through a specific RC network) ensures the reliable establishment and maintenance of the internal power transistor drive voltage, guaranteeing the stable operation of the chip in high-frequency switching mode. On the output side, the inductor L2, together with multiple parallel filter capacitors (C13, C14, C16) and auxiliary RC networks (such as R21, R22, R29, R23, etc.), constitute a high-efficiency, low-ripple LC filter network, achieving smooth processing of the switching node voltage. By employing adequate filtering and voltage regulation design at both the input and output terminals, the interference of switching noise on other parts of the system is effectively suppressed, enhancing the overall circuit's immunity and long-term operational reliability, and significantly improving the output quality and stability of the DC power supply voltage.

[0035] Furthermore, the protection unit uses a Darlington transistor array device. The input control terminal 1 of the Darlington transistor array device is used as the enable terminal WIFI-POWER-ON and grounded. The output drive terminal 16 of the Darlington transistor array device is connected to the output terminal of the DC-DC power module through the current limiting resistor R44. The switching unit uses a P-type MOSFET. The gate 1 of the MOSFET is connected to the output drive terminal 16 of the Darlington transistor array device through a current-regulating resistor R48. The source 3 of the MOSFET is connected to the output terminal of the DC-DC power module. A voltage-regulating capacitor C39 is connected in parallel between the gate 1 and the source 3 of the MOSFET. The drain 2 of the MOSFET is connected to the working power supply terminal.

[0036] In this embodiment, by selecting a Darlington transistor array device to drive the P-type MOSFET for the protection unit, and supplementing it with a current-limiting resistor (R44) and a gate-source voltage regulator (C39) circuit design, reliable and fast driving of the protection unit and the switching unit is achieved. Specifically, the Darlington transistor array device provides high current gain, ensuring that the weak enable signal issued by the processor can be effectively amplified, thereby quickly controlling the gate voltage of the MOSFET; the current-limiting resistor protects the drive circuit, and the gate-source voltage regulator effectively suppresses voltage spikes and oscillations during the switching process, thereby significantly improving the response speed and stability of the MOSFET switching action, enabling it to quickly and completely shut off the main power supply path when receiving a disconnection signal, reliably isolating short-circuit faults at the downstream end.

[0037] Furthermore, the LDO module includes at least an input terminal I, an output terminal O, and a ground terminal G. The input terminal I of the LDO module is connected to the output terminal of the DC-DC power supply module, the output terminal O of the LDO module is connected to the input terminal of the processor, and the ground terminal G of the LDO module is grounded. Furthermore, a voltage regulator capacitor C2 is provided between the input terminal I and the ground terminal G of the LDO module; and a voltage regulator capacitor C3 and a voltage regulator capacitor C4 are provided in parallel between the output terminal O and the ground terminal G of the LDO module.

[0038] In this embodiment, by carefully configuring multiple parallel voltage-regulating capacitors (C2 at the input, C3 and C4 at the output) at the input and output terminals of the LDO module, the power quality of the LDO module's input and output is significantly optimized. Specifically, the input capacitors effectively filter out voltage ripple and noise from the output of the preceding DC-DC power module, providing a stable input voltage for the internal circuitry of the LDO module; the output capacitors greatly reduce the impedance at the output of the LDO module, suppress voltage fluctuations caused by load transients, and absorb high-frequency noise, thereby significantly improving the stability of the low-voltage DC power supplied to the processor and reducing the risk of processor malfunction due to power supply disturbances.

[0039] Furthermore, the reset unit uses a voltage monitoring chip. The input terminal VCC of the voltage monitoring chip receives the output voltage of the LDO module, and outputs a reset signal to the processor's reset pin through the output terminal RESET of the voltage monitoring chip. The ground terminal GND of the voltage monitoring chip is grounded. The input terminal VCC of the voltage monitoring chip is also connected to a voltage regulator capacitor C15 and further reliably grounded. The output terminal RESET of the voltage monitoring chip and the ground terminal GND of the voltage monitoring chip are connected to a voltage regulator resistor R11, a voltage regulator capacitor C23, and a voltage regulator resistor R12 connected in parallel with the two. The reset pin access point of the processor is located between the voltage regulator resistor R11 and the voltage regulator capacitor C23, and a pull-up resistor R15 is provided between the access point of the processor's reset pin and the voltage regulator resistor R11.

[0040] In this embodiment, a reset unit is constructed using a dedicated voltage monitoring chip, and a resistor-capacitor (RC) network (including voltage divider resistors R11 and R12, filter capacitors C15 and C23, pull-up resistor R15, etc.) is used to achieve reliable monitoring of the LDO module output voltage and accurate generation of a reset signal. Specifically, the voltage monitoring chip internally sets a precise threshold voltage and monitors the processor supply voltage in real time from the VCC terminal. When the voltage drops below the threshold, its RESET output terminal responds quickly and changes its state. The external RC network provides necessary filtering and delay, effectively filtering out power supply glitches and preventing false resets. At the same time, the pull-up resistor connected before the reset pin ensures the determinism of the reset signal level, thereby significantly improving the accuracy of the reset response and anti-interference capability of the system when power supply abnormalities occur, such as when the LDO output drops due to a power supply short circuit. This ensures that the processor can be reliably reset and trigger protection actions when the voltage is abnormal. Specifically, the LDO module converts the output voltage of the DC-DC power module into a nominal DC output voltage of 3.3V. The detection threshold of the voltage comparison unit is set to 3.08V. When the output voltage of the LDO module is lower than 3.08V, the output terminal of the reset unit outputs a reset signal to the reset pin of the processor to perform a reset operation.

[0041] Example 3 This embodiment provides a power management system, including a power conversion module, a power protection module, and a control module, wherein the power conversion module is provided with a DC-DC power short-circuit protection circuit as provided in Embodiment 1 or Embodiment 2.

[0042] Obviously, the embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A DC-DC power supply short circuit protection circuit, characterized by, include: DC-DC power module, used to provide DC power supply voltage; The protection module is connected in series to the output terminal of the DC-DC power module and has an enable terminal; The LDO module has its input terminal connected to the output terminal of the DC-DC power module and outputs low-voltage DC power from its output terminal. The processor has its power input connected to the output of the LDO module and at least one of its output pins connected to the enable pin of the protection module. A reset module is connected to the processor's power input terminal and reset pin; The reset module monitors the output voltage of the LDO module and outputs a reset signal to the reset pin of the processor when the voltage is lower than a preset threshold. After receiving the reset signal, the processor outputs a disconnect enable signal from its output pin to the enable terminal of the protection module, thereby controlling the protection module to disconnect.

2. The DC-DC power supply short-circuit protection circuit according to claim 1, characterized in that, The DC-DC power module includes a power conversion unit. The input terminal of the power conversion unit receives a DC input voltage, which is converted by the power conversion unit and outputs a DC power supply voltage.

3. The DC-DC power supply short circuit protection circuit according to claim 2, characterized in that, The power conversion unit uses a power management chip. The power input pin VIN of the power management chip is connected to the DC input voltage transmission point, and the power input pin VIN of the power management chip is also reliably grounded through parallel capacitors C44, C33, and C41; the ground pin GND of the power management chip is reliably grounded. The power management chip's switch pin PH and bootstrap pin BOOT are connected through a bootstrap capacitor C26, and the bootstrap pin BOOT of the power management chip is further connected to the DC input voltage transmission point through the bootstrap capacitor C26, a capacitor C42, and a resistor group R81. The bootstrap pin BOOT of the power management chip is further connected to a resistor group formed by the series connection of inductor L2, resistor R21, resistor R22 and series connection of resistor R29, resistor R23 through the bootstrap capacitor C26 and further grounded, and the output point of the DC power supply voltage is formed between the inductor L2 and the resistor R21. One end of the inductor L2 and the bootstrap capacitor C26 is also connected to a diode C4 and grounded; One end of the inductor L2 is also connected to a capacitor C29, a resistor group R24, and further grounded; The two ends of the inductor L2, which are connected to the output point of the DC power supply voltage, are also connected to capacitors C13, C14, and C16 in parallel and further grounded.

4. The DC-DC power supply short protection circuit according to claim 1, characterized by, The protection module includes a switching unit and a protection unit, and the enable terminal is connected to the output terminal of the DC-DC power module through the protection unit. The switching unit uses a MOSFET, and the gate of the MOSFET is connected to the enable terminal through the protection unit. The source and drain of the MOSFET are respectively connected to the output terminal and the operating power terminal of the DC-DC power module. When the enable terminal of the protection module outputs a disconnect enable signal, the MOSFET is turned off, and the operating power supply terminal is disconnected from the output terminal of the DC-DC power supply module.

5. The DC-DC power supply short circuit protection circuit according to claim 4, characterized in that, The protection unit uses a Darlington transistor array device. The input control terminal 1 of the Darlington transistor array device is used as the enable terminal WIFI-POWER-ON and grounded. The output drive terminal 16 of the Darlington transistor array device is connected to the output terminal of the DC-DC power module through a current limiting resistor R44. The switching unit uses a P-type MOSFET. The gate 1 of the MOSFET is connected to the output drive terminal 16 of the Darlington transistor array device through a current-regulating resistor R48. The source 3 of the MOSFET is connected to the output terminal of the DC-DC power supply module. A voltage-regulating capacitor C39 is connected in parallel between the gate 1 and the source 3 of the MOSFET. The drain 2 of the MOSFET is connected to the working power supply terminal.

6. The DC-DC power supply short circuit protection circuit of claim 1, wherein, The LDO module supplies power to the processor; The LDO module includes at least an input terminal I, an output terminal O, and a ground terminal G. The input terminal I of the LDO module is connected to the output terminal of the DC-DC power supply module, the output terminal O of the LDO module is connected to the input terminal of the processor, and the ground terminal G of the LDO module is grounded. Furthermore, a voltage-stabilizing capacitor C2 is provided between the input terminal I and the ground terminal G of the LDO module; and a voltage-stabilizing capacitor C3 and a voltage-stabilizing capacitor C4 are provided in parallel between the output terminal O and the ground terminal G of the LDO module.

7. The DC-DC power supply short circuit protection circuit of claim 1, wherein, The reset module includes a reset unit. The input terminal of the reset unit is connected to the power input terminal of the processor and is used to receive the output voltage of the LDO module. The reset unit has a built-in voltage comparison unit for comparing the output voltage of the LDO module and outputting a reset signal from the output terminal of the reset unit to the reset pin of the processor.

8. The DC-DC power supply short circuit protection circuit according to claim 7, characterized in that, The detection threshold of the voltage comparison unit is set to 85%-95% of the nominal output voltage of the LDO module.

9. The DC-DC power supply short circuit protection circuit of claim 8, wherein, The reset unit uses a voltage monitoring chip. The input terminal VCC of the voltage monitoring chip receives the output voltage of the LDO module, and outputs a reset signal to the reset pin of the processor through the output terminal RESET of the voltage monitoring chip. The ground terminal GND of the voltage monitoring chip is grounded. The input terminal VCC of the voltage monitoring chip is also connected to a voltage stabilizing capacitor C15 and further reliably grounded. A voltage stabilizing resistor R11, a voltage stabilizing capacitor C23, and a voltage stabilizing resistor R12 connected in parallel are also connected between the output terminal RESET of the voltage monitoring chip and the ground terminal GND of the voltage monitoring chip. The reset pin access point of the processor is located between the voltage stabilizing resistor R11 and the voltage stabilizing capacitor C23, and a pull-up resistor R15 is provided between the access point of the processor's reset pin and the voltage stabilizing resistor R11.

10. A power management system, characterized by, It includes a power conversion module, a power protection module, and a control module, wherein the power conversion module is provided with a DC-DC power short-circuit protection circuit as described in any one of claims 1-9.

Images