Multifunctional energy storage charging and discharging management circuit

Abstract

The utility model relates to a kind of multifunctional energy storage charge-discharge management circuit, including automatic distribution charge-discharge current module, for the real-time power demand of external load, so that the sum of load power and charging power does not exceed the total power of input power supply;Seamless switching module, for realizing the uninterrupted switching of load power supply;Interactive control module, for real-time display battery power grading state;Integrated protection module, for input under-voltage / over-voltage protection, reverse polarity protection and charging over-voltage protection;Master control chip module, for dynamically monitoring load current, battery state and DC input voltage, and control charge-discharge logic.The utility model has the advantages of: can automatically distribute charge-discharge current according to the working current of load, when there is DC power input, priority is given to load power supply, and only the excess power is given to battery charging, to avoid load power+charging power exceeding the total power of input power supply and the like.

Description

Technical Field

[0001] This utility model relates to a multifunctional energy storage charging and discharging management circuit, belonging to the field of electronic technology. Background Technology

[0002] The charge / discharge management circuit establishes a reliable transmission channel between the TV and the power supply, enabling efficient current and voltage transfer. It allows the TV to connect to various external DC power sources and can also be used to connect the TV to its internal battery. Many long-lasting and energy-saving TVs feature this charging management circuit. By connecting the TV and the power supply with this circuit, the TV can be better protected, and different power supply methods can be easily switched.

[0003] In some parts of the world, a stable power supply is unavailable, thus limiting its use. This patent achieves uninterrupted power supply by quickly switching between battery and external DC power. Furthermore, it automatically allocates charging and discharging current based on the load's operating current, prioritizing power to the load when DC power is input, and only using excess power to charge the battery, preventing the load power plus charging power from exceeding the total input power. Currently, the charging and discharging management circuits used in energy-saving TVs still have some shortcomings: 1. Uneven current distribution: When the TV and battery are connected in parallel for charging, the imbalance in current distribution may cause circuit damage. 2. Lacks comprehensive input undervoltage / overvoltage protection, input reverse polarity protection, charging overvoltage protection, and other functions; 3. Lacks battery level display and low battery warning functions; 4. Lack of a sleep mode leads to battery drain; 5. Lacks a complete DC to battery switching function, and cannot seamlessly switch to battery power when the DC input is disconnected; 6. The input voltage range is relatively small, making it difficult to adapt to some application scenarios. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this utility model provides a multifunctional energy storage charging and discharging management circuit. The technical solution of this utility model is as follows: A multifunctional energy storage charging and discharging management circuit includes: The automatic charging and discharging current allocation module is used to supply power to the load through the external DC input interface CON1 according to the real-time power demand of the external load, and allocate the remaining power to the battery interface CON3 for charging the energy storage battery, so that the sum of the load power and the charging power does not exceed the total power of the input power. The seamless switching module is used to switch on the battery power supply path when the DC input voltage is abnormal or interrupted, so as to achieve uninterrupted switching of load power supply. The interactive control module is used to display the battery power level in real time and trigger the sleep mode via physical buttons to reduce standby power consumption. An integrated protection module is provided for input undervoltage / overvoltage protection, reverse polarity protection, and charging overvoltage protection. The main control chip module is used to dynamically monitor load current, battery status and DC input voltage, and control the charging and discharging logic.

[0005] The main control chip module includes chip U1, chip U2 and chip U3. The output terminal of chip U3 is connected to pin 12 of chip U1 and pin P20 of chip U2 to provide 5V power supply. Pin 3 of chip U1 is connected to the source of MOSFET Q9 to control the DC input switching. Pin P19 of chip U2 is connected to pin 7 of chip U4 to achieve state synchronization.

[0006] The automatic charge / discharge current allocation module includes MOSFETs Q6, Q8, and Q9, inductor L1, and adjustable resistor RS1. The drain of MOSFET Q8 is connected to the source of MOSFET Q9, and the source of MOSFET Q8 is connected to the source of MOSFET Q6 through inductor L1. The drain of MOSFET Q6 is connected to battery interface CON3 through adjustable resistor RS1. The source of MOSFET Q9 is connected to load interface CON2. Pin 2 of chip U1 is connected to the gate of MOSFET Q8, and pin 22 of chip U1 is connected to the gate of MOSFET Q6. The charge / discharge on / off state is controlled by adjusting the gate voltage.

[0007] The seamless switching module includes chip U4, MOSFETs Q3 and Q4, transistor Q5, and Zener diode ZD3. Pin 7 of chip U4 is connected to the source of MOSFET Q9 via resistor R5 to monitor the DC input status. Pin 5 of chip U4 is connected to the base of transistor Q5 via resistor R23. The collector of transistor Q5 is connected to the gates of MOSFETs Q3 and Q4. The drain of MOSFET Q3 is connected to battery interface CON3, and the drain of MOSFET Q4 is connected to load interface CON2. Zener diode ZD3 is connected in parallel between the gate and source of MOSFETs Q3 and Q4.

[0008] The integrated protection module includes Zener diode ZD4, diodes D3 and D7, and chip U2; the anode of diode D3 is connected to the source of MOSFET Q9, and the cathode of diode D3 is connected to the input terminal of chip U3 through resistor R44; the cathode of Zener diode ZD4 is connected to pin 15 of chip U2 to achieve overvoltage discharge, and the anode is grounded; diode D7 is connected in series between the gate of MOSFET Q9 and pin 10 of chip U2 for reverse polarity blocking.

[0009] The interactive control module includes a physical button K1 and light-emitting diodes LED1-LED4. Button K1 is connected to ground via a series resistor R37 and then connected to pin P13 of chip U2. The anodes of LED1-LED4 are connected to pins P12, P11, P9, and P8 of chip U2 via resistors R32-R35, respectively, and the cathodes are grounded. Chip U2 controls the on / off state of the LEDs according to the battery voltage to display the battery level.

[0010] The charging power distribution logic is as follows: chip U1 outputs a high level to the source of MOSFETs Q8 and Q6 through pin 29, and simultaneously outputs a low level to the gate of MOSFETs Q8 and Q6 through pins 2 and 22 of chip U1, so that MOSFETs Q8 and Q6 are turned on; the external DC input powers the load through CON1, MOSFET Q9, and CON2, and the remaining power charges the battery through MOSFET Q8, inductor L1, MOSFET Q6, adjustable resistor RS1, and battery interface CON3.

[0011] The advantages of this utility model are: (1) It can automatically allocate the charging and discharging current according to the working current of the load. When there is DC power input, it will give priority to powering the load and only use the excess power to charge the battery, so as to avoid the load power + charging power exceeding the total power of the input power. (2) By connecting capacitors in parallel at the DC input terminal, TV output terminal, and battery charging terminal, it has good shock resistance and stability, can cope with the current surge of frequent start-stop, and is suitable for underdeveloped areas with unstable voltage. (3) It has complete input undervoltage / overvoltage protection, input reverse polarity protection, charging overvoltage protection and other functions. When the input voltage is ≤10.8V, ≥29.5V or the input voltage is reversed, DC power supply will be prohibited. When the battery voltage exceeds the set value or the battery is removed, the protection board will stop charging and indicate that the battery is faulty. (4) By setting a physical button, in battery working mode, pressing and holding the button for 5 seconds will cause the power indicator lights to turn off one by one from high to low, and then the protection board will enter sleep mode to avoid long-term standby and consumption of battery power. A short press of the button can wake up the circuit and display the battery power through the indicator lights. 4 green lights are constant and indicate that the battery power is 100%. 3 green lights are always on and 1 light is off and indicate that the battery power is 75%-99%. 2 green lights are always on and 2 lights are off and indicate that the battery power is 50%-74%. 1 green light is always on and 3 lights are off and indicate that the battery power is 25%-49%. 1 red light is always on and 3 lights are off and indicate that the battery power is 4%-24%. 1 red light is flashing and 3 lights are off and indicate that the battery power is ≤3%. (5) It has a complete DC and battery switching function. When the DC input is <9.7V or there is a sudden power failure, it can seamlessly switch to battery power. When there is no DC input, the load can be powered by the battery by pressing the button. (6) Supports DC10~30V wide voltage input, making it more applicable. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0013] Figure 2 yes Figure 1 The structural diagram of the automatic charging and discharging current allocation module.

[0014] Figure 3 yes Figure 1 Structure diagram of the seamless switching module.

[0015] Figure 4 yes Figure 1 Structure diagram of the interactive control module.

[0016] Figure 5 yes Figure 1 Structure diagram of the integrated protection module. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0018] See Figures 1 to 5 This utility model relates to a multifunctional energy storage charging and discharging management circuit, comprising: The automatic charging and discharging current allocation module is used to supply power to the load through the external DC input interface CON1 according to the real-time power demand of the external load, and allocate the remaining power to the battery interface CON3 for charging the energy storage battery, so that the sum of the load power and the charging power does not exceed the total power of the input power. The seamless switching module is used to switch on the battery power supply path when the DC input voltage is abnormal or interrupted, so as to achieve uninterrupted switching of load power supply. The interactive control module is used to display the battery power level in real time and trigger the sleep mode via physical buttons to reduce standby power consumption. An integrated protection module is used for input undervoltage / overvoltage protection, reverse polarity protection, and charging overvoltage protection; The main control chip module is used to dynamically monitor load current, battery status and DC input voltage, and control the charging and discharging logic.

[0019] The main control chip module includes chip U1, chip U2 and chip U3. The output terminal of chip U3 is connected to pin 12 of chip U1 and pin P20 of chip U2 to provide 5V power supply. Pin 3 of chip U1 is connected to the source of MOSFET Q9 to control the DC input switching. Pin P19 of chip U2 is connected to pin 7 of chip U4 to achieve state synchronization.

[0020] The automatic charge / discharge current allocation module includes MOSFETs Q6, Q8, and Q9, inductor L1, and adjustable resistor RS1. The drain of MOSFET Q8 is connected to the source of MOSFET Q9, and the source of MOSFET Q8 is connected to the source of MOSFET Q6 through inductor L1. The drain of MOSFET Q6 is connected to battery interface CON3 through adjustable resistor RS1. The source of MOSFET Q9 is connected to load interface CON2. Pin 2 of chip U1 is connected to the gate of MOSFET Q8, and pin 22 of chip U1 is connected to the gate of MOSFET Q6. The charge / discharge on / off state is controlled by adjusting the gate voltage.

[0021] In the automatic charging and discharging current distribution module, capacitor C2 is connected in parallel between pins 1 and 2 of socket CON1, and pin 2 is connected to pin 3 and ground; resistor R1 is connected between the drain and gate of MOSFET Q9; capacitor C1 is connected between the gate of MOSFET Q9 and the anode of diode D7; capacitor C25 is connected between the source of MOSFET Q9 and pins 3 and 4 of socket CON2, and pins 1 and 2 of socket CON2 are connected to the source of MOSFET Q9; adjustable resistor RS2 is connected between pins 3 and 4 of socket CON2 and ground; the anode of diode D3 is connected to the source of MOSFET Q9, and the cathode is connected to resistor R44; resistor R44 is connected between the cathode of diode D3 and the input terminal of chip U3; capacitor C27 is connected between the input terminal of chip U3 and ground; capacitor C26 is connected between the output terminal (5V) of chip U3 and ground, and the output terminal of chip U3 is connected to pin 12 of chip U1.

[0022] Polarized capacitor EC2 and capacitor C5 are connected in parallel between the drain of MOSFET Q8 and ground. The drain of MOSFET Q8 is connected to the source of MOSFET Q9. Resistor R16 is connected between the gate of MOSFET Q8 and pin 2 of chip U1. Inductor L1 is connected between the source of MOSFET Q8 and the source of MOSFET Q6. Resistor R7 and capacitor C7 are connected in series between the source of MOSFET Q8 and ground. Resistor R8 and capacitor C8 are connected in series between the source of MOSFET Q6 and ground. Capacitor C3 is connected between the drain of MOSFET Q6 and ground. Adjustable resistor RS1 is connected between the drain of MOSFET Q6 and socket CON. Between pins 1 and 2 of socket 3; polarized capacitor EC1 and capacitor C6 are connected in parallel between pins 1 and 2 of socket CON3 and ground; resistor R24 ​​is connected between the source of MOSFET Q9 and pin 3 of chip U1; capacitor C14 is connected between pin 3 and pin 5 of chip U1, with pin 5 of chip U1 grounded; resistor R21 and capacitor 12 are connected in series between pins 1 and pins 4 and 29 of chip U1; resistor R39 is connected between pin 6 of chip U1 and ground; capacitor C15 is connected between pins 7 and 8 of chip U1 and ground; resistor R41 and capacitor C19 are connected in parallel between pins of chip U1. Pin 9 is connected between the chip U1 and ground; capacitor C19 is connected between pin 10 of chip U1 and ground; capacitor C23 is connected between pin 11 of chip U1 and ground; capacitor C22 is connected between pin 12 of chip U1 and ground; capacitor C20 is connected between pin 15 of chip U1 and ground; resistor R30 and capacitor C21 are connected in series between pin 15 of chip U1 and ground; pins 13 and 14 of chip U1 are grounded; resistor R31 is connected between pin 16 of chip U1 and ground; capacitor C17 and resistor R29 are connected in parallel between pin 16 of chip U1 and the drain of MOSFET Q3; capacitor C16 is connected between the chip U1 and ground. Between pins 17 and 18 of chip U1; resistor R28 is connected between pin 18 of chip U1 and the drain of MOSFET Q3; resistor R26 is connected between pin 17 of chip U1 and the drain of MOSFET Q6; pin 19 of chip U1 is connected to the drain of MOSFET Q3; pin 20 of chip U1 is grounded; resistor R17 is connected between pin 22 of chip U1 and the gate of MOSFET Q6; resistor R22 and capacitor C13 are connected in series between pins 23 and 28 of chip U1 and the source of MOSFET Q6; capacitor C10 is connected between chip U1 and ground; pins 24 and 25 of chip U1 are grounded.

[0023] The seamless switching module includes chip U4, MOSFET Q3, MOSFET Q4, transistor Q5, and Zener diode ZD3; pin 7 of chip U4 is connected to the source of MOSFET Q9 through resistor R5 to monitor the DC input status; pin 5 of chip U4 is connected to the base of transistor Q5 through resistor R23; the collector of transistor Q5 is connected to the gate of MOSFET Q3 and MOSFET Q4; the drain of MOSFET Q3 is connected to battery interface CON3, and the drain of MOSFET Q4 is connected to load interface CON2; Zener diode ZD3 is connected in parallel between the gate and source of MOSFET Q3 and MOSFET Q4.

[0024] In the seamless switching module, capacitor C2 is connected in parallel between pins 1 and 2 of socket CON1, with pin 2 connected to pin 3 and ground; resistor R1 is connected between the drain and gate of MOSFET Q9; capacitor C1 is connected between the gate of MOSFET Q9 and the anode of diode D7; capacitor C25 is connected between the source of MOSFET Q9 and pins 3 and 4 of socket CON2, with pins 1 and 2 of socket CON2 connected to the source of MOSFET Q9; adjustable resistor RS2 is connected between pins 3 and 4 of socket CON2 and ground; diode D2 and resistor R5 are connected in series, with the anode connected to the source of MOSFET Q9 and the cathode connected to resistor R5, the other end of resistor R5 connected to pin 7 of chip U4; resistor R49 and capacitor C27 are connected in parallel between pin 6 of chip U4 and ground; resistor R47 is connected between pin 7 and pin 8 of chip U4; capacitor C18 is connected between pin 8 of chip U4 and ground; resistor R27 is connected between pins 1 and 2 of chip U4. Resistor R45 is connected between pin 2 of chip U4 and pins 3 and 4 of socket CON2; resistor R46 is connected between pin 2 and pin 3 of chip U4; resistor R50 is connected between pin 3 and pin 4 of chip U4, with pin 4 of chip U4 grounded; resistor R48 and diode D6 are connected in series between pin 6 and pin 5 of chip U4; resistor R23 is connected between pin 5 of chip U4 and transistor Q. The base of transistor Q5 is connected to the base of transistor Q5; resistor R25 is connected between the base and emitter of transistor Q5, with the emitter grounded; resistor R18 is connected between the collector of transistor Q5 and the gate of MOSFETs Q3 and Q4; Zener diode ZD3 and resistor R9 are connected in parallel between the gate and source of MOSFETs Q3 and Q4; the drain of MOSFET Q4 is connected to pins 3 and 4 of socket CON2; the drain of MOSFET Q3 is connected to pins 1 and 2 of socket CON3; pins 3 and 4 of socket CON3 are grounded.

[0025] The integrated protection module includes Zener diode ZD4, diodes D3 and D7, and chip U2; the anode of diode D3 is connected to the source of MOSFET Q9, and the cathode of diode D3 is connected to the input terminal of chip U3 through resistor R44; the cathode of Zener diode ZD4 is connected to pin 15 of chip U2 to achieve overvoltage discharge, and the anode is grounded; diode D7 is connected in series between the gate of MOSFET Q9 and pin 10 of chip U2 for reverse polarity blocking.

[0026] The interactive control module includes a physical button K1 and light-emitting diodes LED1-LED4. Button K1 is connected to ground via a series resistor R37 and then connected to pin P13 of chip U2. The anodes of LED1-LED4 are connected to pins P12, P11, P9, and P8 of chip U2 via resistors R32-R35, respectively, and the cathodes are grounded. Chip U2 controls the on / off state of the LEDs according to the battery voltage to display the battery level.

[0027] In the aforementioned interactive control module, capacitor C2 is connected in parallel between pins 1 and 2 of socket CON1, with pin 2 connected to pin 3 and ground; resistor R1 is connected between the drain and gate of MOSFET Q9; capacitor C1 and diode D7 are connected in series between the gate of MOSFET Q9 and pin P10 of chip U2; capacitor C25 is connected between the source of MOSFET Q9 and pins 3 and 4 of socket CON2, with pins 1 and 2 of socket CON2 connected to the source of MOSFET Q9; adjustable resistor RS2 is connected between pins 3 and 4 of socket CON2 and ground; the anode of diode D3 is connected to the source of MOSFET Q9, and the cathode is connected to resistor R44; the anode of diode D4 is connected to pins 1 and 2 of socket CON3 via J1, and the cathode... Connect the negative terminal of diode D3; connect resistor R44 between the negative terminal of diode D3 and the input terminal of chip U3; ground pins 3 and 4 of socket CON3; connect capacitor C27 between the input terminal of chip U3 and ground; connect capacitor C26 between the output terminal (5V) of chip U3 and ground, and connect the output terminal of chip U3 to pin P20 of chip U2 and pin 1 of socket P1; connect diode D2 and resistor R5 in series, with the positive terminal connected to the source of MOSFET Q9 and the negative terminal connected to resistor R5, and the other end of resistor R5 connected to pin 7 of chip U4; connect resistor R49 and capacitor C27 in parallel between pin 6 of chip U4 and ground; connect resistor R47 between pin 7 and pin 8 of chip U4; connect capacitor C18 to the chip... Resistor R27 is connected between pin 8 of U4 and ground; resistor R45 is connected between pin 2 of U4 and pins 3 and 4 of socket CON2; resistor R46 is connected between pin 2 and pin 3 of U4; resistor R50 is connected between pin 3 and pin 4 of U4, pin 4 of U4 is grounded; resistor R48 and diode D6 are connected in series between pin 6 and pin 5 of U4; resistor R23 is connected between pin 5 of U4 and the base of transistor Q5; resistor R25 is connected between the base and emitter of transistor Q5, the emitter is grounded; resistor R18 is connected between the collector of transistor Q5 and the MOSFET. Between the gates of transistors Q3 and Q4; Zener diode ZD3 and resistor R9 are connected in parallel between the gate and source of transistors Q3 and Q4; the drain of transistor Q4 is connected to pins 3 and 4 of socket CON2; the drain of transistor Q3 is connected to pins 1 and 2 of socket CON3; resistor R4 is connected between pin P14 and pin 1 of chip U2; capacitor C4 is connected between pin P14 of chip U2 and ground; resistor R6 is connected between the cathode of diode D2 and pin P15 of chip U2; Zener diode ZD4 is connected between pin P15 of chip U2 and ground; capacitor C9 and resistor R14 are connected in parallel between pin P19 of chip U2 and ground, and pin P19 of chip U2 is connected to pin 7 of chip U4;Resistor R43 is connected between pin P16 of chip U2 and pin 8 of chip U4; pin P1 of chip U2 is grounded; resistor R51 is connected between pin P17 of chip U2 and the base of transistor Q7; resistor R13 is connected between the base and emitter of transistor Q7; the emitter of transistor Q7 is grounded; the collector of transistor Q7 is connected to the collector of transistor Q5; resistor R19 is connected between pin P6 of chip U2 and the emitter of transistor Q11; resistor R20 is connected between the emitter of transistor Q11 and ground; capacitor C11 is connected between pin P6 of chip U2 and ground; resistor R42 is connected between pin P6 of chip U2 and the base of transistor Q11; resistor R40 is connected between the base of transistor Q11 and ground; resistor R15 is connected between the collector of transistor Q11 and pin 1 of socket CON3. Between pins P20 and ground; capacitor C24 is connected between pin P20 of chip U2 and ground; resistor R37 and button K1 are connected in series between pin P13 of chip U2 and ground; LED1 and resistor R32 are connected in series between pin P12 of chip U2 and the output terminal of chip U3; LED2 and resistor R33 are connected in series between pin P11 of chip U2 and the output terminal of chip U3; LED3 and resistor R34 are connected in series between pin P9 of chip U2 and the output terminal of chip U3; LED1 and resistor R32 are connected in series between pin P7 and pin P8 of chip U2; pin P3 of chip U2 is connected to pin 4 of socket P1; pin P4 of chip U2 is connected to pin 3 of socket P1; pin 1 of socket P1 is connected to the output terminal of chip U3, and pin 2 of socket P1 is grounded.

[0028] The charging power distribution logic is as follows: chip U1 outputs a high level to the source of MOSFETs Q8 and Q6 through pin 29, and simultaneously outputs a low level to the gate of MOSFETs Q8 and Q6 through pins 2 and 22 of chip U1, so that MOSFETs Q8 and Q6 are turned on; the external DC input powers the load through CON1, MOSFET Q9, and CON2, and the remaining power charges the battery through MOSFET Q8, inductor L1, MOSFET Q6, adjustable resistor RS1, and battery interface CON3.

[0029] The working principle of this utility model is as follows: (1) The external DC is input through the CON1 circuit. Capacitor C1 is connected to pin 10 of chip U2 and charged to the positive terminal of DC. Chip U2 is connected to chip U3 through pin 5 to transmit signals. Chip U3 is connected to pin 12 of chip U1 to supply power to chip U1 and transmit signals. After receiving the signal from chip U3, chip U1 inputs a high level to the source of MOSFET Q9 through pin 3. At this time, the gate and drain of MOSFET Q9 are connected to the positive terminal of DC, and the potential is lower than the source potential. MOSFET Q9 is turned on, and the circuit starts to work. The source of MOSFET Q9 is connected to chip U3 through diode D3, converting the DC input into a 5V voltage, which supplies power to chip U1 and chip U2 respectively through pin 12 of chip U1 and pin 20 of chip U2. The source of MOSFET Q9 is connected to interfaces 1 and 2 of socket CON2 to supply power to external devices (such as TVs).

[0030] (2) When a signal with external DC input is received, chip U1 outputs a high level to the source of MOSFETs Q8 and Q6 through pin 29, and at the same time outputs a low level to the gate of MOSFETs Q8 and Q6 through pins 2 and 22 respectively, so that Vgs is less than the turn-on voltage, MOSFETs Q8 and Q6 are turned on, and the external DC charges the battery through socket CON3. Parallel capacitors and series inductors are used to prevent the battery from being damaged by excessive voltage and current changes. The charging current is adjusted by adjustable resistor RS1, and the charging power is intelligently allocated, giving priority to powering the load, and only using excess power to charge the battery.

[0031] (3) When the input voltage is too high or too low, chip U1 inputs a low level to the source of MOSFET Q9 through interface 3, causing the MOSFET to turn off and blocking the DC input. When the DC input voltage is too high, excess current can be released through the Zener diode ZD4 connected to pin 15 of chip U2 to protect other components. At the same time, chip U2 controls LED4 connected between pins 2 and 8 to flash a red light to issue an alarm. When the DC input is reversed, diode D3 does not conduct, chip U3 cannot output 5V voltage to power chip U1 and chip U2, chip U1 cannot output a high level to the source of MOSFET Q9, MOSFET Q9 turns off, and the entire circuit stops working.

[0032] (4) In battery-powered mode, when the physical button K1 is pressed for a long time, chip U2 receives a signal from pin 13. It controls LED1, LED2, LED3, and LED4 to turn off one by one through pins 12, 11, 9, 8, and 2 respectively. At the same time, it outputs a signal through pin 17 to turn off MOSFETs Q3 and Q4, and the battery stops discharging. When the physical button K1 is pressed for a short time, chip U2 receives a signal from pin 13. Based on the voltage signal of CON3 connected to the battery received by pins 5 and 6, it controls LED1, LED2, LED3, and LED4 to turn on and off through pins 12, 11, 9, 8, and 2 respectively. At the same time, it outputs a current signal through pin 17, which is transmitted through transistor Q7 to resistor R9 connected to the gate and source of MOSFETs Q3 and Q4, so that the voltage across R9 reaches the turn-on voltage of MOSFETs Q3 and Q4, MOSFETs Q3 and Q4 turn on, and the battery starts discharging.

[0033] (5) In DC power supply mode, when the DC input is suddenly disconnected or reduced to a certain voltage, the signal is transmitted to chip U4 through pin 7 of chip U4. Chip U4 transmits the signal through pins 5 and 6 to resistor R9 connected to the gate and source of MOSFET Q3 and MOSFET Q4 via transistor Q5, so that the voltage across resistor R9 reaches the turn-on voltage of MOSFET Q3 and MOSFET Q4, and MOSFET Q3 and MOSFET Q4 are turned on, seamlessly switching to battery power supply.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multifunctional energy storage charging and discharging management circuit, characterized in that, include: The automatic charging and discharging current allocation module is used to supply power to the load through the external DC input interface CON1 according to the real-time power demand of the external load, and allocate the remaining power to the battery interface CON3 for charging the energy storage battery, so that the sum of the load power and the charging power does not exceed the total power of the input power. The seamless switching module is used to switch on the battery power supply path when the DC input voltage is abnormal or interrupted, so as to achieve uninterrupted switching of load power supply. The interactive control module is used to display the battery power level in real time and trigger the sleep mode via physical buttons to reduce standby power consumption. An integrated protection module is provided for input undervoltage / overvoltage protection, reverse polarity protection, and charging overvoltage protection. The main control chip module is used to dynamically monitor load current, battery status and DC input voltage, and control the charging and discharging logic.

2. The multifunctional energy storage charging and discharging management circuit according to claim 1, characterized in that, The main control chip module includes chip U1, chip U2 and chip U3. The output terminal of chip U3 is connected to pin 12 of chip U1 and pin P20 of chip U2 to provide 5V power supply. Pin 3 of chip U1 is connected to the source of MOSFET Q9 to control the DC input switching. Pin P19 of chip U2 is connected to pin 7 of chip U4 to achieve state synchronization.

3. The multifunctional energy storage charging and discharging management circuit according to claim 2, characterized in that, The automatic charge / discharge current allocation module includes MOSFETs Q6, Q8, and Q9, inductor L1, and adjustable resistor RS1. The drain of MOSFET Q8 is connected to the source of MOSFET Q9, and the source of MOSFET Q8 is connected to the source of MOSFET Q6 through inductor L1. The drain of MOSFET Q6 is connected to battery interface CON3 through adjustable resistor RS1. The source of MOSFET Q9 is connected to load interface CON2. Pin 2 of chip U1 is connected to the gate of MOSFET Q8, and pin 22 of chip U1 is connected to the gate of MOSFET Q6. The charge / discharge on / off state is controlled by adjusting the gate voltage.

4. The multifunctional energy storage charging and discharging management circuit according to claim 1, characterized in that, The seamless switching module includes chip U4, MOSFETs Q3 and Q4, transistor Q5, and Zener diode ZD3. Pin 7 of chip U4 is connected to the source of MOSFET Q9 via resistor R5 to monitor the DC input status. Pin 5 of chip U4 is connected to the base of transistor Q5 via resistor R23. The collector of transistor Q5 is connected to the gates of MOSFETs Q3 and Q4. The drain of MOSFET Q3 is connected to battery interface CON3, and the drain of MOSFET Q4 is connected to load interface CON2. Zener diode ZD3 is connected in parallel between the gate and source of MOSFETs Q3 and Q4.

5. The multifunctional energy storage charging and discharging management circuit according to claim 1, characterized in that, The integrated protection module includes Zener diode ZD4, diodes D3 and D7, and chip U2; The positive terminal of diode D3 is connected to the source of MOSFET Q9, and the negative terminal of diode D3 is connected to the input terminal of chip U3 through resistor R44; the negative terminal of Zener diode ZD4 is connected to pin 15 of chip U2 to achieve overvoltage discharge, and the positive terminal is grounded; diode D7 is connected in series between the gate of MOSFET Q9 and pin 10 of chip U2 for reverse polarity blocking.

6. The multifunctional energy storage charging and discharging management circuit according to claim 1, characterized in that, The interactive control module includes a physical button K1 and light-emitting diodes LED1-LED4. Button K1 is connected to ground via a series resistor R37 and then connected to pin P13 of chip U2. The anodes of LED1-LED4 are connected to pins P12, P11, P9, and P8 of chip U2 via resistors R32-R35, respectively, and the cathodes are grounded. Chip U2 controls the on / off state of the LEDs according to the battery voltage to display the battery level.

7. The multifunctional energy storage charging and discharging management circuit according to claim 2, characterized in that, The charging power distribution logic is as follows: chip U1 outputs a high level to the source of MOSFETs Q8 and Q6 through pin 29, and simultaneously outputs a low level to the gate of MOSFETs Q8 and Q6 through pins 2 and 22 of chip U1, so that MOSFETs Q8 and Q6 are turned on; the external DC input powers the load through CON1, MOSFET Q9, and CON2, and the remaining power charges the battery through MOSFET Q8, inductor L1, MOSFET Q6, adjustable resistor RS1, and battery interface CON3.

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