Power failure holding method with impact current limiting function

Abstract

The invention relates to the field of power supplies of electronic equipment, in particular to a power failure maintaining method with an impact current limiting function, and solves the problem that the equipment can normally work when being started up through mutual cooperation of an anti-backflow limiting module, an energy storage capacitor, a starting current limiting module, a DC-DC control module and a DC-DC power conversion module. In order to meet the requirements of starting-up current limitation, normal power consumption reduction and power failure maintenance and improve the reliability of electronic equipment in three different stages of starting-up current limitation, normal power consumption reduction and power failure maintenance, the application comprises S1, an anti-countercurrent limiting module, an energy storage capacitor, a starting-up current limiting module, a DC-DC control module and a DC-DC power conversion module, the anti-backflow limiting module is connected with the DC-DC power conversion module through a wire, one end of the energy storage capacitor is connected to a load through the anti-backflow limiting module and the starting current limiting module, the starting current limiting module is connected with the DC-DC power conversion module through a wire, and the DC-DC control module is connected with the DC-DC power conversion module through a wire.

Description

Technical Field

[0001] The present invention relates to the field of power supplies for electronic devices, and particularly to a power-down holding method with an inrush current limiting function. Background Art

[0002] With the rapid development of electronic technology, electronic devices are becoming more and more complex, with a growing variety and higher requirements. Any electronic device requires a safe and reliable power supply. At the same time, due to the complexity of its functions, the requirements for the power supply system of the device and the power quality of the device itself are also getting higher and higher, such as requirements for inrush current limiting during device startup, resistance to peak voltage, resistance to overvoltage surges, and input power-down maintenance. However, there will be certain fluctuations in the power supply system. For example, the voltage range of the DC - 48V power supply system in the communication field is - 37V~ - 60VDC, and the voltage range of the DC power supply system on airplanes is generally 18VDC~32VDC. Electronic devices are easily affected by power supply fluctuations, resulting in unstable voltage and affecting their functions. Even some electronic devices such as servers and airborne critical devices, when the power supply system suddenly experiences abnormal power-down, the control logic inside the device fails and cannot meet the timing logic required by the chip, resulting in the device being unable to work properly again. At the same time, the device cannot record relevant information during power-down, which has a greater impact on the reliability of the device. Summary of the Invention

[0003] Technical Problems to be Solved In order to overcome the problems that electronic devices are easily affected by power supply fluctuations, resulting in unstable voltage and affecting their functions. Even some electronic devices such as servers and airborne critical devices, when the power supply system suddenly experiences abnormal power-down, the control logic inside the device fails and cannot meet the timing logic required by the chip, resulting in the device being unable to work properly again. At the same time, the device cannot record relevant information during power-down, which has a greater impact on the reliability of the device.

[0004] Technical Solution The technical solution of the present invention is as follows: S1. It includes an anti-backflow limiting module, an energy storage capacitor, an inrush current limiting module, a DC-DC control module, and a DC-DC power conversion module. The anti-backflow limiting module and the DC-DC power conversion module are connected by a wire. One end of the energy storage capacitor is connected to the load through the anti-backflow limiting module and the inrush current limiting module. The inrush current limiting module and the DC-DC power conversion module are connected by a wire. The DC-DC control module and the DC-DC power conversion module are connected by a wire; S2. When the input is reversely connected, the anti-backflow limiting module is implemented by using an ORing controller in cooperation with MOS transistor VT2. When the power supply system powers down, the energy storage capacitor can be disconnected from the power supply system, and the gate-drain voltage of VT2 can be made 0, so that VT2 is not conducting; S3. When the input is powered on normally, the system starts to receive power from the external power supply. The anti-backflow limit module turns on VT2 to allow current to flow through VT2. The start-up current limit module turns off VT1, and the current charges the capacitor C1 through VT2 and the resistor R1, and waits for a certain period until the capacitor C1 is fully charged. S4. The MOS drive delays to output a high level, turning on VT1, and the current starts to flow through VT1, enabling the DC-DC power conversion: the DC-DC control module enables the DC-DC power conversion module to start normal output. S5. When the input loses power, the anti-backflow limit module ORing controller turns off the MOS transistor VT2.

[0005] Preferably, through the cooperation of the anti-backflow limit module, energy storage capacitor, start-up current limit module, DC-DC control module and DC-DC power conversion module combination module, the device meets the requirements of start-up current limit, reduces normal power consumption, and maintains power-off during three different stages of start-up, normal operation, and input power-off, improving the reliability of the electronic device.

[0006] Further, in S2, it is implemented by using an ORing controller in cooperation with the MOS transistor VT2. When the power supply system loses power, the energy storage capacitor can be disconnected from the power supply system to prevent the energy storage capacitor from discharging to the power supply system or other devices. Specifically, the ORing controller can detect the state of the power supply system. When the power supply system loses power, the ORing controller can control the conduction and disconnection of the MOS transistor VT2, thereby cutting off the connection between the energy storage capacitor and the power supply system and preventing the energy storage capacitor from discharging to the power supply system or other devices.

[0007] Further, in S2, the energy storage capacitor stores electrical energy in the capacitor C1 when the power supply system is normal. When the power supply system loses power, it provides electrical energy for the device to maintain the device's operation for a specific period.

[0008] Further, in S3, when there is a large energy storage capacitor inside the device and a voltage is suddenly applied to the device, the capacitor is equivalent to a short circuit and the start-up current is very large. At this time, the delay circuit controls the MOS transistor V1 to disconnect, and limits the current through the resistor R1 to charge the capacitor C1. When the voltage across the capacitor is fully charged, VT1 is turned on, and the current flows through VT1 to provide electrical energy for the subsequent DC-DC conversion and energy storage capacitor.

[0009] Further, in S3, VT1 is an N-channel MOSFET or an NPN BJT. The startup current limiting module turns VT1 off. VT1 acts as a switch to control the on / off of the current. When VT1 is off, the current does not flow through it, thereby limiting the current in the circuit. VT2 is a P-channel MOSFET or a PNP BJT. The anti-backflow limiting module turns VT2 on. VT2 also acts as a switch. When VT2 is on, the current can flow through it, thereby allowing the current to charge the capacitor C1.

[0010] Further, in S3, R1 plays a role in current limiting.

[0011] Further, in S4, the DC-DC control module controls the enable pin of the DC-DC power conversion module. When the driving voltage of VT1 is established, the DC-DC power conversion module is enabled to supply power to the subsequent load normally.

[0012] Further, the DC-DC control module that controls the DC-DC power conversion module is not only equipped with an integrated wired communication interface but also with wireless communication technologies, which can be Wi-Fi, Bluetooth, ZigBee, LoRa, and can achieve remote monitoring and adjustment.

[0013] Further, in S5, by providing a voltage monitoring circuit to monitor the input voltage in real time. When the input voltage is lower than the set threshold, the monitoring circuit outputs an alarm signal.

[0014] Further, in S5, an alarm indicator is installed at the same time. When the monitoring circuit outputs an alarm signal, the alarm indicator lights up to remind the user to handle it in time.

[0015] Advantageous Effects Compared with the prior art, the advantageous effects of the present invention are as follows: Through the cooperation of the anti-backflow limiting module, energy storage capacitor, startup current limiting module, DC-DC control module, and DC-DC power conversion module combination module, the device meets the requirements of startup current limiting, reduced normal power consumption, and power-off retention in three different stages of startup, normal operation, and input power-off, improving the reliability of the electronic device. Description of the Drawings

[0016] Figure 1 It is a flowchart of a power-off retention method with an inrush current limiting function according to the present invention. Detailed Embodiments

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Embodiment 1: Please refer to Figure 1, the present invention provides a power-off holding method with an impact current limiting function, including the following steps: S1. It includes an anti-backflow limiting module, an energy storage capacitor, a startup current limiting module, a DC-DC control module, and a DC-DC power conversion module. The anti-backflow limiting module and the DC-DC power conversion module are connected by a wire. One end of the energy storage capacitor is connected to the load through the anti-backflow limiting module and the startup current limiting module. The startup current limiting module and the DC-DC power conversion module are connected by a wire. The DC-DC control module and the DC-DC power conversion module are connected by a wire; S2. When the input is reversely connected, the anti-backflow limiting module is realized by using an ORing controller in cooperation with MOS transistor VT2. When the power supply system loses power, the energy storage capacitor can be disconnected from the power supply system, and the gate-drain voltage of VT2 can be made 0, so that VT2 is not turned on. The energy storage capacitor stores electrical energy in capacitor C1 when the power supply system is normal. When the power supply system loses power, it provides electrical energy for the device to maintain the operation of the device for a specific time; S3. When the input is normally powered on, the system starts to receive external power supply. The anti-backflow limiting module turns on VT2 to allow current to flow through VT2. The startup current limiting module turns off VT1. The current charges capacitor C1 through VT2 and resistor R1. Wait for a certain time until capacitor C1 is fully charged. When there is a large energy storage capacitor inside the device and a voltage is suddenly applied to the device, the capacitor is equivalent to a short circuit and the startup current is very large. At this time, the delay circuit controls MOS transistor V1 to disconnect, and limits the current through resistor R1 to charge capacitor C1. When the voltage across the capacitor is fully charged, VT1 is turned on, and the current flows through VT1 to provide electrical energy for the subsequent DC-DC conversion and the energy storage capacitor. VT1 is an N-channel MOSFET or an NPN BJT. The startup current limiting module turns off VT1, and VT1 plays a role of a switch to control the on and off of the current. When VT1 is turned off, the current does not flow through it, thus limiting the current in the circuit. VT2 is a P-channel MOSFET or a PNP BJT. When the anti-backflow limiting module turns on VT2, VT2 also plays a role of a switch. When VT2 is turned on, the current can flow through it, thus allowing the current to charge capacitor C1. R1 plays a role of current limiting. After the circuit is started, VT1 and VT2 play a role of reducing power consumption; S4. The MOS drive delay outputs a high level, turning on VT1, and the current starts to flow through VT1, enabling the DC-DC power conversion: The DC-DC control module enables the DC-DC power conversion module to start normal output. The DC-DC control module controls the enable pin of the DC-DC power conversion module. When the drive voltage of VT1 is established, it enables the DC-DC power conversion module to supply power to the subsequent load normally. The DC-DC control module controls the DC-DC power conversion module, which not only has an integrated wired communication interface but also has wireless communication technologies, such as Wi-Fi, Bluetooth, ZigBee, LoRa, and can achieve remote monitoring and adjustment. S5. When the input power is cut off, the anti-backflow limit module ORing controller turns off the MOS transistor VT2 to prevent the energy storage capacitor from discharging to the power supply system or other devices. At the same time, it is equipped with a voltage monitoring circuit to monitor the input voltage in real time. When the input voltage is lower than the set threshold, the monitoring circuit outputs an alarm signal, and an alarm indicator is installed. When the monitoring circuit outputs an alarm signal, the alarm indicator lights up to remind the user to handle it in time.

[0019] It should be noted that: The time for the capacitor to be fully charged depends on multiple factors, including the capacitance value of the capacitor, the resistance value of the resistor R1, the conduction state of VT2, and the initial conditions. To calculate the time for the capacitor to be fully charged, the specific values of these parameters need to be known. Assume that it is known: The capacitance value of the capacitor C1 is C, the resistance value of the resistor R1 is R, and the power supply voltage is V. The time for the capacitor to be fully charged can be estimated using the following formula: ( t = \frac{RC}{V} ) Where: ( t ) is the time for the capacitor to be fully charged ( R ) is the resistance value of the resistor R1 ( C ) is the capacitance value of the capacitor C1 ( V ) is the power supply voltage Please provide the capacitance value of the capacitor C1, the resistance value of the resistor R1, and the power supply voltage V so as to calculate the time for the capacitor to be fully charged. In summary, through the cooperation of the anti-backflow limit module, energy storage capacitor, start-up current limit module, DC-DC control module, and DC-DC power conversion module combination module, the device meets the requirements of start-up current limit, reduced normal power consumption, and power-off retention in three different stages of start-up, normal operation, and input power-off, improving the reliability of the electronic device.

[0020] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those skilled in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A power-off retention method with an impact current limiting function, characterized in that, It includes the following steps: S1. It includes an anti-backflow limit module, an energy storage capacitor, a turn-on current limit module, a DC-DC control module, and a DC-DC power conversion module. The anti-backflow limit module and the DC-DC power conversion module are connected by a wire. One end of the energy storage capacitor is connected to the load through the anti-backflow limit module and the turn-on current limit module. The turn-on current limit module and the DC-DC power conversion module are connected by a wire. The DC-DC control module and the DC-DC power conversion module are connected by a wire; S2. When the input is reversely connected, the anti-backflow limit module is implemented by using an ORing controller in cooperation with MOS transistor VT2. When the power supply system loses power, the energy storage capacitor and the power supply system can be disconnected, and the gate-drain voltage of VT2 can be made 0, so that VT2 is not turned on; S3. When the input is normally powered on, the system starts to receive external power supply. The anti-backflow limit module turns on VT2 to allow current to flow through VT2. The turn-on current limit module turns off VT1, and the current charges capacitor C1 through VT2 and resistor R1. Wait for a certain time until capacitor C1 is fully charged; S4. The MOS drive delays to output a high level to turn on VT1, and the current starts to flow through VT1, enabling DC-DC power conversion: The DC-DC control module enables the DC-DC power conversion module to start normal output; S5. When the input loses power, the ORing controller of the anti-backflow limit module turns off MOS transistor VT2.

2. The power-down retention method with an impact current limiting function according to claim 1, characterized in that: In S2, it is implemented by using an ORing controller in cooperation with MOS transistor VT2. When the power supply system loses power, the energy storage capacitor and the power supply system can be disconnected to prevent the energy storage capacitor from discharging to the power supply system or other devices. Specifically, the ORing controller can detect the state of the power supply system. When the power supply system loses power, the ORing controller can control the conduction and disconnection of MOS transistor VT2, thereby cutting off the connection between the energy storage capacitor and the power supply system and preventing the energy storage capacitor from discharging to the power supply system or other devices.

3. The power-down retention method with an impact current limiting function according to claim 1, characterized in that: In S2, when the power supply system is normal, capacitor C1 of the energy storage capacitor stores electrical energy. When the power supply system loses power, it provides electrical energy for the device to maintain the device's operation for a specific time, improving the energy storage utilization efficiency and having an anti-reverse connection protection function.

4. The power failure retention method with an impact current limiting function according to claim 1, characterized in that: In S3, when there is a large energy storage capacitor inside the device and a voltage is suddenly applied to the device, the capacitor is equivalent to a short circuit and the turn-on current is very large. At this time, the delay circuit controls MOS transistor V1 to disconnect, and limits the current through resistor R1 to charge capacitor C1. When the voltage across the capacitor is fully charged, VT1 is turned on, and the current flows through VT1 to provide electrical energy for the subsequent DC-DC conversion and the energy storage capacitor.

5. The power-down holding method with an impact current limiting function according to claim 1, characterized in that: In S3, VT1 is an N-channel MOSFET or an NPN BJT. The startup current limit module turns VT1 off. VT1 acts as a switch to control the on / off of the current. When VT1 is off, the current will not flow through it, thus limiting the current in the circuit. VT2 is a P-channel MOSFET or a PNP BJT. The anti-backflow limit module turns VT2 on. VT2 also acts as a switch. When VT2 is on, the current can flow through it, thus allowing the current to charge the capacitor C1.

6. The power-off holding method with an impact current limiting function according to claim 1, characterized in that: In S3, R1 plays a role in current limiting.

7. The power-off holding method with an impact current limiting function according to claim 1, characterized in that: In S4, the DC-DC control module controls the enable pin of the DC-DC power conversion module. When the driving voltage of VT1 is established, the DC-DC power conversion module is enabled to supply power to the subsequent load normally.

8. The power failure retention method with an impact current limiting function according to claim 7, characterized in that: The DC-DC control module that controls the DC-DC power conversion module is not only equipped with an integrated wired communication interface but also with wireless communication technologies, which can be Wi-Fi, Bluetooth, ZigBee, LoRa, and can achieve remote monitoring and adjustment.

9. The power-down retention method with inrush current limiting function according to claim 1, characterized in that: In S5, by providing a voltage monitoring circuit to monitor the input voltage in real time, when the input voltage is lower than the set threshold, the monitoring circuit outputs an alarm signal.

10. The power-down retention method with an impact current limiting function according to claim 9, characterized in that: In S5, an alarm indicator is also installed. When the monitoring circuit outputs an alarm signal, the alarm indicator lights up to remind the user to handle it in time.

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