Power failure data backup module

Abstract

The utility model aims to provide the system for automatically switching the power failure of the 24V power supply module to the 12V lithium battery data backup for the automobile charging pile, and the system can automatically switch to the 12V lithium battery to supply power when the power failure of the 24V power supply module occurs, carries out data backup, and ensures the continuous operation and data safety of the charging pile. The utility model provides a power failure data backup module, which comprises a 24V power supply module and a 12V lithium battery, the 24V power supply module provides a 24V power supply, and the power failure data backup module is characterized by further comprising a power supply switching module and a data backup module, wherein the 24V power supply module supplies power to the 12V lithium battery through the power supply switching module; the data backup module detects the 24V power supply module and sends an SOC signal to the data module of the charging pile; and the negative electrode of the 12V lithium battery and the power supply switching module are in common ground.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric vehicle charging, specifically relates to a module for automatic data backup when the electric vehicle charging pile loses power. BACKGROUND

[0002] With the popularity of electric vehicles, the demand for electric vehicle charging piles is increasing. Charging piles usually rely on 24V power modules for power supply, but in some cases, such as power failure or power grid fluctuations, the 24V power module may lose power, causing the charging pile to malfunction, and even important data may be lost. Therefore, a system is needed that can automatically switch to a backup power source (such as a 12V lithium battery) for data backup when the 24V power module loses power, to ensure the continuous operation of the charging pile and data security. SUMMARY

[0003] The utility model aims at providing a 24V power module loses power automatically switches 12V lithium battery data backup system for electric vehicle charging pile, this system can automatically switch to 12V lithium battery power supply when 24V power module loses power, and carry out data backup, ensure the continuous operation of the charging pile and data security.

[0004] The utility model provides a power failure data backup module, include: 24V power module, 12V lithium battery, 24V power module provides 24V power, its characterized in that, still include: power switching module and data backup module;

[0005] Wherein 24V power module supplies power to 12V lithium battery through power switching module;

[0006] The data backup module detects the 24V power module and sends the SOC signal to the data module of the charging pile;

[0007] The negative electrode of the 12V lithium battery is connected to the power switching module.

[0008] 24V power module: for normal power supply.

[0009] 12V lithium battery: as a backup power source.

[0010] Power switching module: for detecting the state of the 24V power module and automatically switching to the 12V lithium battery when power failure occurs.

[0011] The working principle of the power failure data backup module is as follows:

[0012] a. Under normal circumstances, the 24V power module supplies power to the charging pile, and the 12V lithium battery is in charging state.

[0013] b. When the 24V power module is powered off, the power switching module detects no voltage output and automatically switches to 12V lithium battery power supply.

[0014] c. At the same time, the data backup module starts to backup important data of the charging pile (such as charging records, user information, etc.) to the non-volatile memory, ensuring that the data is not lost.

[0015] d. When the 24V power module resumes power supply, the power switching module automatically switches back to 24V power module power supply and stops data backup.

[0016] As a preferred, the data backup module includes an optoelectronic coupler, the output end of which is electrically connected to the input end of the inverter;

[0017] The output end of the inverter outputs a SOC signal.

[0018] Data backup module: for backing up important data to non-volatile memory when the power is switched.

[0019] As a preferred, the 24V power supply is electrically connected to pin 1 of optoelectronic coupler U2 through resistor R1, and pin 2 of optoelectronic coupler U2 is grounded;

[0020] The 3.3V voltage source is connected to filter capacitor C1 and input to pin 4 of optoelectronic coupler U2;

[0021] Pin 3 of optoelectronic coupler U2 is grounded through resistor R7, and R7 is connected in parallel with capacitor C4;

[0022] Pin 3 of optoelectronic coupler U2 is connected to terminal A of inverter U4;

[0023] Terminal Y of inverter U4 outputs a SOC_GPIO0_31 signal, pin 3 is grounded, and pin 5 is connected to the 3.3V voltage source through filter capacitor C7.

[0024] As a preferred, the power switching module includes: an optoelectronic coupler for detecting the 24V power module, the output end of which is electrically connected to the gate of the MOS tube;

[0025] The source of the MOS tube is electrically connected to the positive electrode of the 12V lithium battery, and the source-drain of the MOS tube is electrically connected to the 12V power supply;

[0026] The 24V power module outputs 12V power through the DC-DC module.

[0027] As a preferred, pin 1 of optoelectronic coupler U3 is connected to the 24V power supply, and pin 2 of optoelectronic coupler U3 is grounded;

[0028] The 12V power supply is connected to filter capacitor C2 and input to pin 4 of optoelectronic coupler U3;

[0029] The 3-pin of the photoelectric coupler U3 is grounded through the resistor R9, and the R9 is connected with the capacitor C6 in parallel;

[0030] The 3-pin of the photoelectric coupler U3 is electrically connected with the first end of the resistor R4;

[0031] The second end of the resistor R4 is electrically connected with the gate of the MOS tube Q1;

[0032] The positive pole of the 12V lithium battery is electrically connected with the source of the MOS tube Q1, and is also electrically connected with the positive poles of the diodes D1 and D2;

[0033] The negative poles of the diodes D1 and D2 are electrically connected with the first end of the resistor R3;

[0034] The second end of the resistor R3 is electrically connected with the first end of the resistor R4;

[0035] The drain of the MOS tube Q1 is electrically connected with the 12V power supply;

[0036] The MOS tube Q1 is selected from an enhancement mode PMOS.

[0037] The beneficial effect of the utility model lies in: ensuring that the charging pile can still normally operate when the 24V power module is powered off, and avoiding data loss. Without manual intervention, the system automatically completes power switching and data backup. The 12V lithium battery is in a charging state in a standby state, ensures that the electric quantity is sufficient, and reduces energy waste. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The system block diagram of the utility model;

[0039] Figure 2 The data backup module circuit diagram of the utility model;

[0040] Figure 3 The power switching module circuit diagram of the utility model;

[0041] Figure 4 The circuit diagram of the data backup to the storage of the utility model; DETAILED DESCRIPTION

[0042] The technical scheme of the utility model will be further concretely described below by specific embodiments and in combination with the drawings.

[0043] Embodiment 1:

[0044] As shown in the figure, Figures 1 to 4 The power switching module and the data backup module are further included in the power module.

[0045] The 24V power module supplies power to the 12V lithium battery through the power switching module.

[0046] The data backup module detects the 24V power module and sends an SOC signal to the data module of the charging pile.

[0047] The negative electrode of the 12V lithium battery is connected to the power switching module.

[0048] As shown in Figure 2 The 24V power supply is connected to the 1 pin of the optocoupler U2 through the resistor R1, and the 2 pin of the optocoupler U2 is grounded.

[0049] The 3.3V voltage source is connected to the filter capacitor C1 and input to the 4 pin of the optocoupler U2.

[0050] The 3 pin of the optocoupler U2 is connected to the A terminal of the inverter U4 through the resistor R7, and the R7 is connected in parallel with the capacitor C4.

[0051] The 3 pin of the optocoupler U2 is connected to the A terminal of the inverter U4.

[0052] The Y terminal of the inverter U4 outputs the SOC_GPIO0_31 signal, the 3 pin is grounded, and the 5 pin is connected to the 3.3V voltage source through the filter capacitor C7.

[0053] When the external power is off, the 24V stops inputting, the U3 optocoupler stops working, so the 3 pin of the U3 has a voltage of 4V, the gate-source voltage difference of the Q1 is 8V, the Q1 is turned on, the battery BATTERY_12V outputs to make the single board work normally, at this time the U2 optocoupler also stops working, the SOC_GPIO0_31 jumps from low level to high level, the SOC detects the level change and immediately starts data backup through the memory. The SOC detects the level change and immediately backs up the data to the memory through the I2C.

[0054] The backup circuit is as shown in Figure 4 , wherein U18 is a non-volatile memory selected FM24CL64B. And SOC_I2C1_SCL and SOC_I2C1_SDA are data backup lines, which are directly connected to the memory of the charging pile.

[0055] As shown in Figure 3 The power switching module includes: the 1 pin of the optocoupler U3 is connected to the 24V power supply, and the 2 pin of the optocoupler U3 is grounded.

[0056] The 12V power supply is connected to the filter capacitor C2 and input to the 4 pin of the optocoupler U3.

[0057] The 3 pin of the optocoupler U3 is connected to the ground through the resistor R9, and the R9 is connected in parallel with the capacitor C6.

[0058] The third pin of the optocoupler U3 is electrically connected to the first end of the resistor R4.

[0059] The second end of the resistor R4 is electrically connected to the gate of the MOS tube Q1.

[0060] The positive pole of the 12V lithium battery is electrically connected to the source of the MOS tube Q1, and is also electrically connected to the positive poles of the diodes D1 and D2.

[0061] The negative poles of the diodes D1 and D2 are electrically connected to the first end of the resistor R3.

[0062] The second end of the resistor R3 is electrically connected to the first end of the resistor R4.

[0063] The drain of the MOS tube Q1 is electrically connected to the 12V power supply.

[0064] The Q1 model is AO4407C, which belongs to an enhanced PMOS. When normally powered, the 24V power supply is input, and there is a DCDC circuit inside the single board to output 12V. When the voltage of the lithium battery is too low, 12V will flow from the drain of Q1 to the source of Q1 through the internal diode, and the negative pole of the battery is connected to the system ground of the single board, so the charging function is realized.

[0065] U2 and U3 are transistor output optocouplers, and the purpose is to output different levels when externally powered. U4 is an inverter that inverts the high and low level states of the output.

[0066] When normally powered, the 24V power supply is input, and the U3 optocoupler starts to work, outputting 12V, which is the gate potential of Q1. Since the voltage of the lithium battery is 10.5V~12.6V, the output point is the source of Q1, and the gate-source voltage difference is -0.6~+1.5V. The Q1 conduction condition is a gate-source voltage difference of -2.3~-1.3V, so Q1 is cut off. When the voltage of the lithium battery is less than 12V, 12V will flow from the drain of Q1 to the source of Q1 through the internal diode, and the negative pole of the battery is connected to the system ground of the single board, so the charging function is realized. When the external power supply is off, the 24V input stops, and the U3 optocoupler stops working, so the 3-pin potential of U3 is 4V, which is the gate potential of Q1. The gate-source voltage difference of Q1 is 8V, Q1 is turned on, and the lithium battery BATTERY_12V output makes the single board work normally.

Claims

1. Power-loss data backup module, including: A 24V power module and a 12V lithium battery. The 24V power module provides 24V power. It is characterized by further including: a power switching module and a data backup module. The 24V power module supplies power to the 12V lithium battery through a power switching module. The data backup module detects the 24V power supply module and sends a SOC signal to the data module of the charging pile; The negative terminal of the 12V lithium battery shares a common ground with the power switching module.

2. The power-loss data backup module according to claim 1, characterized in that, The data backup module includes an optocoupler for detecting the 24V power supply module, with its output terminal electrically connected to the input terminal of the inverter. The inverter outputs a SOC signal.

3. The power-loss data backup module according to claim 2, characterized in that, A 24V power supply is electrically connected to pin 1 of optocoupler U2 through resistor R1, and pin 2 of optocoupler U2 is grounded. A 3.3V voltage source is connected to filter capacitor C1 and input to pin 4 of optocoupler U2; Pin 3 of optocoupler U2 is grounded through resistor R7, and capacitor C4 is connected in parallel with R7. Pin 3 of optocoupler U2 is connected to pin A of inverter U4; The inverter U4 outputs the SOC_GPIO0_31 signal at its Y terminal, pin 3 is grounded, and pin 5 is connected to a 3.3V voltage source through the filter capacitor C7.

4. The power-loss data backup module according to claim 1, characterized in that, The power switching module includes: an optocoupler for detecting the 24V power module, the output of which is electrically connected to the gate of a MOSFET; The source of the MOSFET is electrically connected to the positive terminal of the 12V lithium battery, and the source and drain of the MOSFET are electrically connected to the 12V power supply. The 24V power module outputs 12V power through the DC-DC module.

5. The power-off data backup module according to claim 1, characterized in that, Pin 1 of optocoupler U3 is connected to a 24V power supply, and pin 2 of optocoupler U3 is grounded. The 12V power supply is connected to the filter capacitor C2 and input to pin 4 of the optocoupler U3; Pin 3 of optocoupler U3 is grounded through resistor R9, and capacitor C6 is connected in parallel with R9; Pin 3 of optocoupler U3 is electrically connected to the first end of resistor R4; The second terminal of resistor R4 is electrically connected to the gate of MOSFET Q1; The positive terminal of the 12V lithium battery is electrically connected to the source of MOSFET Q1, and electrically connected to the positive terminals of diodes D1 and D2; The negative terminals of diodes D1 and D2 are both electrically connected to the first terminal of resistor R3; The second terminal of resistor R3 is electrically connected to the first terminal of resistor R4. The drain of MOSFET Q1 is electrically connected to a 12V power supply; The MOSFET Q1 is an enhancement-type PMOS.

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