Intelligent power management system

Abstract

The present invention provides an intelligent power management system, comprising: a mains power supply module, used for converting the mains power into 24V direct current and outputting it; a charging management circuit, used for converting the 24V direct current into the charging voltage required by a backup battery and providing it to the backup battery for charging, and outputting a charging detection signal to a control circuit; a power supply switching circuit, used for switching to the backup battery for power supply after the mains power is cut off or switching to the mains power supply when the backup battery voltage is insufficient, and the output end of the power supply switching circuit is connected to the input end of a voltage control circuit; a voltage control circuit, used for stepping down the direct current output by the mains power supply module or stepping up the direct current output by the backup battery and outputting 12V direct current to provide to a load; a control circuit, used for acquiring a charging detection signal and a battery voltage signal and uploading them to a monitoring host through a communication circuit, and being able to provide a stable direct current power supply for an intelligent control device.

Description

Technical Field

[0001] The invention relates to a power supply system, and in particular to an intelligent power supply management system. Background Art

[0002] In an intelligent control system, it is necessary to provide a DC power supply for each control circuit. For example, in an access control system, in order to ensure the high reliability of the intelligent control system, it is often necessary to maintain an uninterrupted power supply to each control circuit. When the mains power supply is cut off (mains power outage or power outage due to other faults), it can instantly switch to the backup power supply for power supply.

[0003] The existing power management equipment for intelligent control systems mainly adopts UPS to solve the problem. If a mature set of UPS equipment is used to achieve uninterruptible power supply, the price is often relatively high, and it cannot be integrated with the equipment. The control system deployment takes up more space. For example, in access control, the existing UPS equipment cannot be well arranged, and the space at the access control needs to be modified before it can be used. Of course, there are also low-cost power management systems to achieve uninterruptible power supply for intelligent control systems. However, the existing low-cost power management systems are not stable enough and cannot provide stable power to multiple electrical devices. In addition, the existing low-cost power management systems do not have sufficient management of batteries, which can easily damage the batteries, thereby resulting in poor stability of the entire power management system.

[0004] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0005] In view of this, the present invention provides an intelligent power management system that can provide a stable DC power supply for intelligent control devices with limited space such as access control, without the need for additional modifications to the layout space, thereby reducing the cost of use. It can also manage the backup batteries well, thereby improving the stability of the entire system and extending its service life. It can also monitor the power conversion process in real time, thereby facilitating operation and maintenance and facilitating use.

[0006] An intelligent power management system provided by the present invention includes a mains power supply module, a backup battery, a control circuit, a charging management circuit, a power supply switching circuit, a voltage detection circuit, a voltage control circuit and a communication circuit;

[0007] The mains power supply module is used to convert the mains power into 24V direct current and output it;

[0008] The charging management circuit is used to convert the 24V DC power into the charging voltage required by the backup battery and provide it to the backup battery for charging, and output a charging detection signal to the control circuit;

[0009] The power supply switching circuit is used to switch to the backup battery power supply after the mains power is cut off or switch to the mains power supply when the backup battery voltage is insufficient, and the output end of the power supply switching circuit is connected to the input end of the voltage control circuit;

[0010] The voltage control circuit is used to step down the DC power output by the mains power supply module or step up the DC power output by the backup battery and output 12V DC power to the load;

[0011] The voltage detection circuit is used to detect the voltage of the backup battery and output a battery voltage signal to the control circuit;

[0012] The control circuit is used to obtain the charging detection signal and the battery voltage signal and upload them to the monitoring host through the communication circuit.

[0013] Furthermore, it also includes a temperature control module; the temperature control module is used to detect the ambient temperature and the temperature signal of the power management system and to dissipate heat when the temperature exceeds the standard;

[0014] The temperature control module includes a temperature sensor, a fan and a fan driving circuit; the temperature sensors are two sensors that respectively detect the ambient temperature signal and the temperature signal of the power management system and output them to the control circuit;

[0015] The fan drive circuit has a control input end connected to the control circuit and is used to receive a control signal output by the control circuit to control the circuit conduction between the fan and the power supply when the ambient temperature or the temperature of the power management system exceeds the standard, thereby controlling the operation of the fan.

[0016] Further, the charging management circuit includes a charging voltage stabilization circuit and a charging control circuit;

[0017] The charging voltage stabilizing circuit is used to convert the direct current output by the mains power supply module into 14.1V direct current and output it to the charging control circuit;

[0018] The charging control circuit is used to detect the voltage of the backup battery, and to charge the backup battery when the voltage of the backup battery is less than or equal to the charging voltage threshold, and to output a charging detection signal to the control circuit.

[0019] Further, the voltage control circuit includes a control chip U4, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C23, a capacitor C22, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, an inductor L3, a diode D7, a diode D8, a diode D9, a diode D10, an NMOS tube Q3, an NMOS tube Q4, an NMOS tube Q5, an NMOS tube Q6, and an indicator light LED3;

[0020] The control chip U4 is LTC3780EG;

[0021] One end of the resistor R19 is connected to the 6V power supply, the other end of the resistor R19 is connected to the positive electrode of the indicator light LED3, the negative electrode of the indicator light LED3 is connected to the 1st pin of the control chip U4, the 2nd pin of the control chip U4 is grounded through the capacitor C19, the 5th pin of the control chip U4 is grounded through the capacitor C20, the 5th pin of the control chip U4 is also connected to one end of the resistor R21, the other end of the resistor R21 is grounded through the capacitor C21, the 7th pin and the 9th pin of the control chip U4 are grounded, one end of the resistor R23 is connected to the output end of the voltage control circuit, the other end of the resistor R23 is grounded through the resistor R22, the common connection point of the resistor R22 and the resistor R23 is connected to the 6th pin of the control chip U4, the 12th pin of the control chip U4 is grounded, and the negative electrode of the control chip U4 is connected to the diode D7. The positive electrode of the diode D7 is connected to the 6V power supply, the 22nd pin of the control chip U4 is connected to the negative electrode of the diode D7 through the capacitor C23, the 21st pin of the control chip U4 is grounded through the capacitor 24, the common connection point of the 21st pin of the control chip U4 and the capacitor 24 is connected to one end of the resistor R20, the other end of the resistor R20 is connected to the output end of the power supply switching circuit as the first input end of the voltage control circuit, the 20th pin of the control chip U4 is grounded through the capacitor C25, the 19th pin of the control chip U4 is grounded through the capacitor C26, the 19th pin of the control chip U4 is also connected to the 6V power supply, the 15th pin of the control chip U4 is connected to the negative electrode of the diode D8 through the capacitor C27, the positive electrode of the diode D8 is grounded, and the negative electrode of the diode D8 is connected to the 13th pin of the control chip U4;

[0022] The drain of the NMOS tube Q3 is connected to the output end of the power supply switching circuit as the second input end of the voltage control circuit, the source of the NMOS tube Q3 is connected to the drain of the NMOS tube Q4, the drain of the NMOS tube Q5 is used as the output end of the voltage control circuit to supply power to the electrical equipment, the source of the NMOS tube Q5 is connected to the drain of the NMOS tube Q6, the sources of the NMOS tube Q6 and the NMOS tube Q4 are both grounded through a resistor R26, the common connection point between the resistor R26 and the sources of the NMOS tubes Q5 and Q4 is connected to pin 3 of the control chip U4 through a resistor R24, the common connection point between the resistor R26 and the ground is connected to pin 4 of the control chip U4 through a resistor R25, and the two ends of the capacitor C22 are respectively connected between pins 3 and 4 of the control chip U4;

[0023] The source of the NMOS tube Q3 is connected to the source of the NMOS tube Q5 through the inductor L3, the common connection point between the inductor L3 and the source of the NMOS tube Q3 is connected to the cathode of the diode D10, the anode of the diode D10 is connected to the common connection point between the resistor R26 and the sources of the NMOS tubes Q5 and Q4, the common connection point between the inductor L3 and the source of the NMOS tube Q5 is connected to the anode of the diode D9, the cathode of the diode D9 is connected to the drain of the NMOS tube Q5, The gate of the NMOS tube Q3 is connected to the 14th pin of the control chip U4, the gate of the NMOS tube Q4 is connected to the 16th pin of the control chip U4, the gate of the NMOS tube Q6 is connected to the 18th pin of the control chip U4, the gate of the NMOS tube Q5 is connected to the 23rd pin of the control chip U4, the common connection point of the NMOS tube Q3 and the inductor L3 is connected to the 15th pin of the control chip U4, and the source of the NMOS tube Q5 and the common connection point of the inductor L3 are connected to the 22nd pin of the control chip U4.

[0024] Further, the power supply switching circuit includes a control chip U6, a PMOS tube Q7, a PMOS tube Q8, a PMOS tube Q9, a PMOS tube Q10, a resistor R27 and a capacitor C29;

[0025] The control chip U6 is LTC4412ES6, and pin 1 of the control chip U6 is grounded through a capacitor C29. The common connection point of the control chip U6 and the capacitor C29 is connected to a backup battery. The source electrodes of the PMOS tubes Q9 and Q10 are connected to the backup battery. The source electrodes of the PMOS tubes Q7 and Q8 are connected to the output end of the mains power supply module. The drain electrodes of the PMOS tubes Q7, Q8, Q9, and Q10 are connected to the input end of the voltage control circuit as the output end of the power supply switching circuit.

[0026] Pins 2 and 3 of the control chip U6 are grounded, pin 8 of the control chip U6 is connected to the gates of PMOS tubes Q7 and Q8, pin 9 of the control chip U6 is connected to the gates of PMOS tubes Q9 and Q10, pin 10 of the control chip U6 is connected to the output end of the power supply switching circuit, and pin 8 of the control chip U6 is connected to the output end of the power supply switching circuit through resistor R27.

[0027] Further, the voltage detection circuit includes a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C18, a PMOS tube Q2 and a transistor T1;

[0028] The source of the PMOS tube Q2 is connected to the collector of the transistor T1 through the resistor R13, the gate of the PMOS tube Q2 is connected to the collector of the transistor T1 through the resistor R14, the source of the PMOS tube Q2 is connected to the backup battery, the drain of the PMOS tube Q2 is connected to the ground after being connected in series with the resistor R15 and the resistor R17, the common connection point between the resistor R15 and the resistor R17 is grounded through the capacitor C18, the common connection point between the resistor R15 and the resistor R17 is connected to the detection input end of the control circuit as the output end of the voltage detection circuit, the base of the transistor T1 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the control output end of the control circuit, the common connection point between the resistor R16 and the control output end of the control circuit is connected to the emitter of the transistor T1 through the resistor R18, and the emitter of the transistor T1 is grounded.

[0029] Further, the charging voltage stabilizing circuit includes a diode D1, a diode D2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a control chip U3;

[0030] The positive electrode of the diode D1 is connected to the output end of the mains power supply module, the negative electrode of the diode D1 is connected to the 2nd pin of the control chip U3, the 2nd pin of the control chip U3 is grounded through the capacitor C8, the 2nd pin of the control chip U3 is grounded through the capacitor C3, the common connection point between the capacitor C3 and the 2nd pin of the control chip U3 is connected in series with the resistor R1 and the resistor R2 and then grounded, the common connection point between the resistor R1 and the resistor R2 is connected to the 7th pin of the control chip U3, the 1st pin of the control chip U3 is connected to one end of the inductor L1 through the capacitor C5, and the other end of the inductor L1 is connected to the The 5th pin of the control chip U5 is connected to the common connection point of the inductor L1 and the capacitor C7 through the resistor R3, the 5th pin of the control chip U5 is grounded through the resistor R4, the common connection point of the inductor L1 and the capacitor C7 serves as the output end of the charging voltage stabilizing circuit, the 8th pin of the control chip U3 is grounded through the capacitor C4, the 6th pin of the control chip U3 is grounded after being connected in series with the capacitor C6 and the resistor R5, the 3rd pin of the control chip U3 is connected to the common connection point of the capacitor C5 and the inductor L1, the common connection point of the capacitor C5 and the inductor L1 is connected to the cathode of the diode D2, and the anode of the diode D2 is grounded.

[0031] Further, the charging control circuit includes a control chip U5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C14, a capacitor C15, an indicator LED1, an indicator LED2, a capacitor C16, a capacitor C17, a PMOS tube Q1, a diode D3, a diode D4, a diode D5, a diode D6 and an inductor L2;

[0032] One end of the resistor R8 and the resistor R9 are both connected to the output end of the charging voltage stabilizing circuit, the other end of the resistor R8 is connected to the positive electrode of the indicator light LED1, the negative electrode of the indicator light LED1 is connected to the 4th pin of the control chip U5, the other end of the resistor R9 is connected to the positive electrode of the indicator light LED2, the negative electrode of the indicator light LED2 is connected to the 3rd pin of the control chip U5, the 1st pin of the control chip U5 is connected to the output end of the charging voltage stabilizing circuit through the capacitor C14, the 2nd pin of the control chip U5 is grounded, and the 5th pin of the control chip U5 is connected to the ground after being connected in series with the resistor R10 and the capacitor C15; one end of the resistor R6 is connected to the 5V power supply, the other end of the resistor R6 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is connected to the 3rd pin of the control chip U5, one end of the resistor R7 is connected to the 5V power supply, the other end of the resistor R7 is connected to the positive electrode of the diode D6, the negative electrode of the diode D6 is connected to the 4th pin of the control chip U5, and the positive electrode of the diode D5 and the positive electrode of the diode D6 are connected to the control circuit as the charging detection end;

[0033] The source of the PMOS tube Q1 is connected to the output end of the charging voltage stabilizing circuit, and the source of the PMOS tube Q1 is also connected to the 9th pin of the control chip U5, and the 9th pin of the control chip U5 is grounded through the capacitor C17. The drain of the PMOS tube Q1 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the negative electrode of the diode D4. The positive electrode of the diode D4 is grounded, and the negative electrode of the diode D3 is connected to one end of the resistor R12 through the inductor L2. The other end of the resistor R12 is grounded through the capacitor C16. The common connection point of the inductor L2 and the resistor R12 is connected to the 8th pin of the control chip U5, and the 7th pin of the control chip U5 is connected to the common connection point of the resistor R12 and the capacitor C16. The common connection point of the resistor R12 and the capacitor C16 is connected to the 6th pin of the control chip U5 through the resistor R11, and the 10th pin of the control chip U5 is connected to the gate of the PMOS tube Q1.

[0034] Further, the fan driving circuit includes a resistor R28, a resistor R29, a resistor R30, a resistor R31, a PMOS tube Q11 and a transistor T2;

[0035] The source of the PMOS tube Q11 is connected to the collector of the transistor T2 through the resistor R28, the gate of the PMOS tube Q11 is connected to the collector of the transistor T2 through the resistor R29, the source of the PMOS tube Q11 is connected to the output end of the voltage control circuit, the drain of the PMOS tube Q11 is connected to the cathode of the diode D11, the anode of the diode D11 is grounded, the common connection point between the cathode of the diode D11 and the drain of the PMOS tube Q11 is connected to the power supply end of the fan as the output end of the fan driving circuit, the base of the transistor T2 is connected to one end of the resistor R30, the other end of the resistor R30 is connected to the control output end of the control circuit as the control end of the fan driving circuit, the common connection point between the resistor R30 and the control output end of the control circuit is connected to the emitter of the transistor T1 through the resistor R31, and the emitter of the transistor T2 is grounded.

[0036] Furthermore, the communication circuit is an RS232 interface circuit composed of a chip MAX3232ESE+ and its peripheral circuits.

[0037] The beneficial effects of the present invention are as follows: Through the present invention, a stable DC power supply can be provided for intelligent control devices with limited space such as access control, without the need for additional modifications to the layout space, thereby reducing the cost of use. The backup battery can also be well managed, thereby improving the stability of the entire system and extending its service life. The power supply conversion process can also be monitored in real time, thereby facilitating operation and maintenance and facilitating use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0039] Figure 1 It is a structural principle block diagram of the present invention.

[0040] Figure 2 It is the control circuit principle diagram of the present invention.

[0041] Figure 3 It is the principle diagram of the charging voltage stabilizing circuit of the present invention.

[0042] Figure 4 It is a schematic diagram of the communication circuit of the present invention.

[0043] Figure 5 It is a schematic diagram of the charging control circuit of the present invention.

[0044] Figure 6 It is the principle diagram of the voltage detection circuit of the present invention.

[0045] Figure 7 It is a schematic diagram of the power supply switching circuit of the present invention.

[0046] Figure 8 It is the principle diagram of the voltage control circuit of the present invention.

[0047] Fig. 9 The fan driving circuit schematic diagram of the present invention.

[0048] Fig.10 This is a schematic diagram of the output filter circuit of the present invention.

[0049] Fig.11 This is the principle diagram of the input filter circuit of the present invention. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0051] An intelligent power management system provided by the present invention includes a mains power supply module, a backup battery, a control circuit, a charging management circuit, a power supply switching circuit, a voltage detection circuit, a voltage control circuit and a communication circuit;

[0052] The mains power supply module is used to convert the mains power into 24V direct current and output it;

[0053] The charging management circuit is used to convert the 24V DC power into the charging voltage required by the backup battery and provide it to the backup battery for charging, and output a charging detection signal to the control circuit;

[0054] The power supply switching circuit is used to switch to the backup battery power supply after the mains power is cut off or switch to the mains power supply when the backup battery voltage is insufficient, and the output end of the power supply switching circuit is connected to the input end of the voltage control circuit;

[0055] The voltage control circuit is used to step down the DC power output by the mains power supply module or step up the DC power output by the backup battery and output 12V DC power to the load;

[0056] The voltage detection circuit is used to detect the voltage of the backup battery and output a battery voltage signal to the control circuit;

[0057] The control circuit is used to obtain the charging detection signal and the battery voltage signal and upload them to the monitoring host through the communication circuit, wherein the mains power supply module adopts the existing circuit structure, including a full-bridge rectifier circuit composed of diodes, a filter circuit and a voltage stabilizing circuit. These circuits can adopt the existing circuits and are used to convert 220V AC into 24V DC output. The control circuit adopts the PIC16F1824-I / ML chip, and the communication circuit is an RS232 interface circuit composed of the chip MAX3232ESE+ and its peripheral circuits. Through the present invention, a stable DC power supply can be provided for limited space intelligent control equipment such as access control, without the need for additional layout space modification, reducing the use cost, and being able to manage the backup battery well, thereby improving the stability of the entire system and extending the service life, and being able to monitor the power supply conversion process in real time, thereby facilitating operation and maintenance and convenient use.

[0058] In this embodiment, a temperature control module is also included; the temperature control module is used to detect the ambient temperature and the temperature signal of the power management system and to dissipate heat when the temperature exceeds the standard;

[0059] The temperature control module includes a temperature sensor, a fan and a fan driving circuit; the temperature sensors are two sensors that respectively detect the ambient temperature signal and the temperature signal of the power management system and output them to the control circuit;

[0060] The fan driving circuit has a control input terminal connected to the control circuit, and is used to receive a control signal output by the control circuit to control the circuit conduction between the fan and the power supply when the ambient temperature or the temperature of the power management system exceeds the standard, thereby controlling the fan to work, wherein the temperature sensor adopts a DS18B20 temperature sensor; wherein:

[0061] The fan driving circuit includes a resistor R28, a resistor R29, a resistor R30, a resistor R31, a PMOS tube Q11 and a transistor T2;

[0062] The source of the PMOS tube Q11 is connected to the collector of the transistor T2 through the resistor R28, the gate of the PMOS tube Q11 is connected to the collector of the transistor T2 through the resistor R29, the source of the PMOS tube Q11 is connected to the output end of the voltage control circuit, the drain of the PMOS tube Q11 is connected to the cathode of the diode D11, the anode of the diode D11 is grounded, and the common connection point between the cathode of the diode D11 and the drain of the PMOS tube Q11 is connected to the power supply end of the fan as the output end of the fan drive circuit, the base of the transistor T2 is connected to one end of the resistor R30, and the other end of the resistor R30 is connected to the control end of the control circuit as the control end of the fan drive circuit. The output end is connected, and the common connection point between the resistor R30 and the control output end of the control circuit is connected to the emitter of the transistor T1 through the resistor R31, and the emitter of the transistor T2 is grounded. Specifically, the control input end of the fan drive circuit is connected to the pin 10 of the control circuit, and the output ends of the two temperature sensors are respectively connected to the 1st and 2nd feet of the control circuit U1. After receiving the temperature signal, the control circuit compares it with the set ambient temperature threshold and the maximum operating temperature threshold of the power supply system. If any temperature exceeds the set threshold, the control circuit controls the transistor T2 to turn on, so that the PMOS tube Q11 is turned on, and the fan drive circuit supplies power to the power supply end of the fan, and the fan starts to work.

[0063] In this embodiment, the charging management circuit includes a charging voltage stabilization circuit and a charging control circuit;

[0064] The charging voltage stabilizing circuit is used to convert the direct current output by the mains power supply module into 14.1V direct current and output it to the charging control circuit;

[0065] The charging control circuit is used to detect the voltage of the backup battery, and to charge the backup battery when the voltage of the backup battery is less than or equal to the charging voltage threshold, and to output a charging detection signal to the control circuit. Through the above structure, the battery can be stably charged and the battery can be prevented from being overcharged, thereby ensuring the working life of the backup battery.

[0066] In this embodiment, the voltage control circuit includes a control chip U4, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C23, a capacitor C22, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, an inductor L3, a diode D7, a diode D8, a diode D9, a diode D10, an NMOS tube Q3, an NMOS tube Q4, an NMOS tube Q5, an NMOS tube Q6, and an indicator LED3;

[0067] The control chip U4 is LTC3780EG;

[0068] One end of the resistor R19 is connected to the 6V power supply, the other end of the resistor R19 is connected to the positive electrode of the indicator light LED3, the negative electrode of the indicator light LED3 is connected to the 1st pin of the control chip U4, the 2nd pin of the control chip U4 is grounded through the capacitor C19, the 5th pin of the control chip U4 is grounded through the capacitor C20, the 5th pin of the control chip U4 is also connected to one end of the resistor R21, the other end of the resistor R21 is grounded through the capacitor C21, the 7th pin and the 9th pin of the control chip U4 are grounded, one end of the resistor R23 is connected to the output end of the voltage control circuit, the other end of the resistor R23 is grounded through the resistor R22, the common connection point of the resistor R22 and the resistor R23 is connected to the 6th pin of the control chip U4, the 12th pin of the control chip U4 is grounded, and the negative electrode of the control chip U4 is connected to the diode D7. The positive electrode of the diode D7 is connected to the 6V power supply, the 22nd pin of the control chip U4 is connected to the negative electrode of the diode D7 through the capacitor C23, the 21st pin of the control chip U4 is grounded through the capacitor 24, the common connection point of the 21st pin of the control chip U4 and the capacitor 24 is connected to one end of the resistor R20, the other end of the resistor R20 is connected to the output end of the power supply switching circuit as the first input end of the voltage control circuit, the 20th pin of the control chip U4 is grounded through the capacitor C25, the 19th pin of the control chip U4 is grounded through the capacitor C26, the 19th pin of the control chip U4 is also connected to the 6V power supply, the 15th pin of the control chip U4 is connected to the negative electrode of the diode D8 through the capacitor C27, the positive electrode of the diode D8 is grounded, and the negative electrode of the diode D8 is connected to the 13th pin of the control chip U4;

[0069] The drain of the NMOS tube Q3 is connected to the output end of the power supply switching circuit as the second input end of the voltage control circuit, the source of the NMOS tube Q3 is connected to the drain of the NMOS tube Q4, the drain of the NMOS tube Q5 is used as the output end of the voltage control circuit to supply power to the electrical equipment, the source of the NMOS tube Q5 is connected to the drain of the NMOS tube Q6, the sources of the NMOS tube Q6 and the NMOS tube Q4 are both grounded through a resistor R26, the common connection point between the resistor R26 and the sources of the NMOS tubes Q5 and Q4 is connected to pin 3 of the control chip U4 through a resistor R24, the common connection point between the resistor R26 and the ground is connected to pin 4 of the control chip U4 through a resistor R25, and the two ends of the capacitor C22 are respectively connected between pins 3 and 4 of the control chip U4;

[0070] The source of the NMOS tube Q3 is connected to the source of the NMOS tube Q5 through the inductor L3, the common connection point between the inductor L3 and the source of the NMOS tube Q3 is connected to the cathode of the diode D10, the anode of the diode D10 is connected to the common connection point between the resistor R26 and the sources of the NMOS tubes Q5 and Q4, the common connection point between the inductor L3 and the source of the NMOS tube Q5 is connected to the anode of the diode D9, the cathode of the diode D9 is connected to the drain of the NMOS tube Q5, the gate of the NMOS tube Q3 is connected to the 14th pin of the control chip U4, the gate of the NMOS tube Q4 is connected to the 16th pin of the control chip U4, the gate of the NMOS tube Q6 is connected to the 18th pin of the control chip U4, the gate of the NMOS tube Q5 is connected to the 23rd pin of the control chip U4, the common connection point of the NMOS tube Q3 and the inductor L3 is connected to the 15th pin of the control chip U4. The source of the NMOS tube Q5 and the common connection point of the inductor L3 are connected to the 22nd pin of the control chip U4, wherein the voltage control circuit is used to step down or step up the input voltage, thereby outputting a stable 12V DC power, wherein the 21st pin of the control chip U4 is used to detect the input voltage, and the resistors R22 and R23 are used to detect the output voltage of the voltage control circuit, thereby ensuring the stability of the output 12V DC power, the control chip U4 performs step-up and step-down processing by controlling the bridge transformer circuit composed of the NMOS tubes Q3-Q5, specifically by controlling the duty cycle of each NMOS tube, the 4th pin and the 3rd pin of the control chip U4 are used to detect the working current of the bridge transformer circuit, thereby ensuring the stability of the output voltage, in order to ensure the accuracy of the control, an input filter circuit and an output filter circuit are also provided in the voltage control circuit, such as Fig.11 and Fig.10 As shown, the voltage control circuit outputs a stable 12V DC power after filtering through the output filter circuit, and the voltage output by the power supply switching circuit is filtered through the input filter circuit and then supplied to the voltage control circuit.

[0071] In this embodiment, the power supply switching circuit includes a control chip U6, a PMOS tube Q7, a PMOS tube Q8, a PMOS tube Q9, a PMOS tube Q10, a resistor R27 and a capacitor C29;

[0072] The control chip U6 is LTC4412ES6, and pin 1 of the control chip U6 is grounded through a capacitor C29. The common connection point of the control chip U6 and the capacitor C29 is connected to a backup battery. The source electrodes of the PMOS tubes Q9 and Q10 are connected to the backup battery. The source electrodes of the PMOS tubes Q7 and Q8 are connected to the output end of the mains power supply module. The drain electrodes of the PMOS tubes Q7, Q8, Q9, and Q10 are connected to the input end of the voltage control circuit as the output end of the power supply switching circuit.

[0073] Pins 2 and 3 of the control chip U6 are grounded, pin 8 of the control chip U6 is connected to the gates of PMOS tubes Q7 and Q8, pin 9 of the control chip U6 is connected to the gates of PMOS tubes Q9 and Q10, pin 10 of the control chip U6 is connected to the output end of the power supply switching circuit, and pin 8 of the control chip U6 is connected to the output end of the power supply switching circuit through a resistor R27. In the mains power supply path and the backup battery power supply path, two PMOS tubes are connected in parallel, thereby achieving a good current expansion effect, on the one hand, ensuring the safety of the PMOS tube of the power supply switching circuit, and on the other hand, improving the load capacity of the entire circuit. Among them, pin 1 of the control chip U6 is used to detect the voltage of the backup battery, and pin 10 is used to detect the voltage of the backup battery. The pin is used to detect the output of the AC power supply module. When the AC power is supplied, the control chip U6 controls the PMOS tube Q7 and PMOS tube Q8 to be turned on, and controls the PMOS tube Q9 and PMOS tube Q10 to be turned off. When the AC power is cut off, there is no voltage on pin 10. At this time, the control chip U6 controls the PMOS tube Q7 and PMOS tube Q8 to be turned off, and the PMOS tube Q9 and PMOS tube Q10 to be turned on. The backup battery is used for power supply, and the detection of pin 10 is not recognized. The control chip U6 only recognizes the voltage of the backup battery detected by pin 1. When the voltage of the backup battery is lower than the safe voltage of the battery, the control chip U6 controls the PMOS tube Q7 and PMOS tube Q8 to be turned on, and the PMOS tube Q9 and PMOS tube Q10 to be turned off, thereby completing the two-way switching.

[0074] In this embodiment, the voltage detection circuit includes a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C18, a PMOS tube Q2 and a transistor T1;

[0075] The source of the PMOS tube Q2 is connected to the collector of the transistor T1 through the resistor R13, the gate of the PMOS tube Q2 is connected to the collector of the transistor T1 through the resistor R14, the source of the PMOS tube Q2 is connected to the backup battery, the drain of the PMOS tube Q2 is connected to the ground after being connected in series with the resistor R15 and the resistor R17, the common connection point between the resistor R15 and the resistor R17 is grounded through the capacitor C18, the common connection point between the resistor R15 and the resistor R17 is connected to the detection input end of the control circuit as the output end of the voltage detection circuit, the base of the transistor T1 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the control output end of the control circuit, and the connection between the resistor R16 and the control output end of the control circuit is connected to the detection input end of the control circuit. The common connection point is connected to the emitter of the transistor T1 through the resistor R18, and the emitter of the transistor T1 is grounded. The control end DECT of the voltage detection circuit is connected to the 7th pin of the control circuit, and the output ADC of the voltage detection circuit is connected to the 6th pin of the control circuit. The control circuit detects the voltage of the backup battery through the voltage detection circuit. This detection is an active detection, that is, the control circuit detects according to the set detection timing, such as once every 10 minutes. When the detection time is reached, the transistor T1 is controlled to be turned on, and then the PMOS tube Q2 is turned on. The voltage is divided by the resistor R15 and the resistor R17, and is input to the control circuit after filtering by the capacitor C18. The control circuit uploads the detection information to the monitoring center through the communication circuit.

[0076] In this embodiment, the charging voltage stabilizing circuit includes a diode D1, a diode D2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a control chip U3;

[0077] The positive electrode of the diode D1 is connected to the output end of the mains power supply module, the negative electrode of the diode D1 is connected to the 2nd pin of the control chip U3, the 2nd pin of the control chip U3 is grounded through the capacitor C8, the 2nd pin of the control chip U3 is grounded through the capacitor C3, the common connection point between the capacitor C3 and the 2nd pin of the control chip U3 is connected in series with the resistor R1 and the resistor R2 and then grounded, the common connection point between the resistor R1 and the resistor R2 is connected to the 7th pin of the control chip U3, the 1st pin of the control chip U3 is connected to one end of the inductor L1 through the capacitor C5, the other end of the inductor L1 is grounded through the capacitor C7, the 5th pin of the control chip U5 is connected to the common connection point of the inductor L1 and the capacitor C7 through the resistor R3, and the 5th pin of the control chip U5 is connected to the common connection point of the inductor L1 and the capacitor C7 through the resistor R4. The common connection point of the inductor L1 and the capacitor C7 is used as the output end of the charging voltage stabilizing circuit, the 8th pin of the control chip U3 is grounded through the capacitor C4, the 6th pin of the control chip U3 is connected to the ground after being connected in series with the capacitor C6 and the resistor R5, the 3rd pin of the control chip U3 is connected to the common connection point of the capacitor C5 and the inductor L1, the common connection point of the capacitor C5 and the inductor L1 is connected to the cathode of the diode D2, and the anode of the diode D2 is grounded, wherein the control chip U3 is the MP2303CN chip, the resistors R1 and R2 adopt the input voltage, the 7th pin of the control chip U3 tracks the input voltage, and the 5th pin of the control chip U3 tracks the output voltage, thereby providing a stable 14.1V DC power for the charging control circuit.

[0078] In this embodiment, the charging control circuit includes a control chip U5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C14, a capacitor C15, an indicator LED1, an indicator LED2, a capacitor C16, a capacitor C17, a PMOS tube Q1, a diode D3, a diode D4, a diode D5, a diode D6 and an inductor L2;

[0079] One end of the resistor R8 and the resistor R9 are both connected to the output end of the charging voltage stabilizing circuit, the other end of the resistor R8 is connected to the positive electrode of the indicator light LED1, the negative electrode of the indicator light LED1 is connected to the 4th pin of the control chip U5, the other end of the resistor R9 is connected to the positive electrode of the indicator light LED2, the negative electrode of the indicator light LED2 is connected to the 3rd pin of the control chip U5, the 1st pin of the control chip U5 is connected to the output end of the charging voltage stabilizing circuit through the capacitor C14, the 2nd pin of the control chip U5 is grounded, and the 5th pin of the control chip U5 is connected to the ground after being connected in series with the resistor R10 and the capacitor C15; one end of the resistor R6 is connected to the 5V power supply, the other end of the resistor R6 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is connected to the 3rd pin of the control chip U5, one end of the resistor R7 is connected to the 5V power supply, the other end of the resistor R7 is connected to the positive electrode of the diode D6, the negative electrode of the diode D6 is connected to the 4th pin of the control chip U5, and the positive electrode of the diode D5 and the positive electrode of the diode D6 are connected to the control circuit as the charging detection end;

[0080] The source of the PMOS tube Q1 is connected to the output end of the charging voltage stabilizing circuit, the source of the PMOS tube Q1 is also connected to the 9th pin of the control chip U5, the 9th pin of the control chip U5 is grounded through the capacitor C17, the drain of the PMOS tube Q1 is connected to the positive electrode of the diode D3, the negative electrode of the diode D3 is connected to the negative electrode of the diode D4, the positive electrode of the diode D4 is grounded, the negative electrode of the diode D3 is connected to one end of the resistor R12 through the inductor L2, the other end of the resistor R12 is grounded through the capacitor C16, the common connection point of the inductor L2 and the resistor R12 is connected to the 8th pin of the control chip U5, the 7th pin of the control chip U5 is connected to the common connection point of the resistor R12 and the capacitor C16, the common connection point of the resistor R12 and the capacitor C16 is connected to the 6th pin of the control chip U5 through the resistor R11, and the 10th pin of the control chip U5 is connected to the gate of the PMOS tube Q1, wherein the resistor R6 and the diode D5, the resistor R7 and the diode D6 form A charging detection circuit is formed, and the detection signal is input into the control circuit. The control chip U5 is a CN3763 control chip, and its 7-pin is used to detect the voltage of the backup battery. When the voltage of the backup battery is less than or equal to the safety voltage threshold (i.e., the voltage threshold that needs to be charged), the PMOS tube Q1 is controlled to be turned on. At this time, the 3 and 4 pins of the control chip U6 are turned to a low level, the indicator light is on to indicate charging, and the positive outputs of the diodes D5 and D6 are low. The control circuit recognizes that the low level means that the backup battery enters the charging state. When the charging is completed, that is, the voltage of the backup battery reaches its fully charged rated voltage, the control chip U5 controls the PMOS tube Q1 to be turned off and stop charging. At this time, the 3 and 4 pins are turned to a high level, the indicator light is off, and the control circuit recognizes that the current backup battery is fully charged. The control circuit counts and uploads the number of times the backup battery is charged, thereby monitoring the number of times the battery is charged and discharged.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An intelligent power management system, characterized in that: It includes a mains power supply module, a backup battery, a control circuit, a charging management circuit, a power supply switching circuit, a voltage detection circuit, a voltage control circuit and a communication circuit; The mains power supply module is used to convert the mains power into 24V direct current and output it; The charging management circuit is used to convert the 24V DC power into the charging voltage required by the backup battery and provide it to the backup battery for charging, and output a charging detection signal to the control circuit; The power supply switching circuit is used to switch to the backup battery power supply after the mains power is cut off or switch to the mains power supply when the backup battery voltage is insufficient, and the output end of the power supply switching circuit is connected to the input end of the voltage control circuit; The voltage control circuit is used to step down the DC power output by the mains power supply module or step up the DC power output by the backup battery and output 12V DC power to the load; The voltage detection circuit is used to detect the voltage of the backup battery and output a battery voltage signal to the control circuit; The control circuit is used to obtain the charging detection signal and the battery voltage signal and upload them to the monitoring host through the communication circuit; The voltage control circuit includes a control chip U4, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C23, a capacitor C22, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, an inductor L3, a diode D7, a diode D8, a diode D9, a diode D10, an NMOS tube Q3, an NMOS tube Q4, an NMOS tube Q5, an NMOS tube Q6, and an indicator light LED3; The control chip U4 is LTC3780EG; One end of the resistor R19 is connected to the 6V power supply, the other end of the resistor R19 is connected to the positive electrode of the indicator light LED3, the negative electrode of the indicator light LED3 is connected to the 1st pin of the control chip U4, the 2nd pin of the control chip U4 is grounded through the capacitor C19, the 5th pin of the control chip U4 is grounded through the capacitor C20, the 5th pin of the control chip U4 is also connected to one end of the resistor R21, the other end of the resistor R21 is grounded through the capacitor C21, the 7th pin and the 9th pin of the control chip U4 are grounded, one end of the resistor R23 is connected to the output end of the voltage control circuit, the other end of the resistor R23 is grounded through the resistor R22, the common connection point of the resistor R22 and the resistor R23 is connected to the 6th pin of the control chip U4, the 12th pin of the control chip U4 is grounded, and the negative electrode of the control chip U4 is connected to the diode D7. The positive electrode of the diode D7 is connected to the 6V power supply, the 22nd pin of the control chip U4 is connected to the negative electrode of the diode D7 through the capacitor C23, the 21st pin of the control chip U4 is grounded through the capacitor 24, the common connection point of the 21st pin of the control chip U4 and the capacitor 24 is connected to one end of the resistor R20, the other end of the resistor R20 is connected to the output end of the power supply switching circuit as the first input end of the voltage control circuit, the 20th pin of the control chip U4 is grounded through the capacitor C25, the 19th pin of the control chip U4 is grounded through the capacitor C26, the 19th pin of the control chip U4 is also connected to the 6V power supply, the 15th pin of the control chip U4 is connected to the negative electrode of the diode D8 through the capacitor C27, the positive electrode of the diode D8 is grounded, and the negative electrode of the diode D8 is connected to the 13th pin of the control chip U4; The drain of the NMOS tube Q3 is connected to the output end of the power supply switching circuit as the second input end of the voltage control circuit, the source of the NMOS tube Q3 is connected to the drain of the NMOS tube Q4, the drain of the NMOS tube Q5 is used as the output end of the voltage control circuit to supply power to the electrical equipment, the source of the NMOS tube Q5 is connected to the drain of the NMOS tube Q6, the sources of the NMOS tube Q6 and the NMOS tube Q4 are both grounded through a resistor R26, the common connection point between the resistor R26 and the sources of the NMOS tubes Q5 and Q4 is connected to pin 3 of the control chip U4 through a resistor R24, the common connection point between the resistor R26 and the ground is connected to pin 4 of the control chip U4 through a resistor R25, and the two ends of the capacitor C22 are respectively connected between pins 3 and 4 of the control chip U4; The source of the NMOS tube Q3 is connected to the source of the NMOS tube Q5 through the inductor L3, the common connection point between the inductor L3 and the source of the NMOS tube Q3 is connected to the cathode of the diode D10, the anode of the diode D10 is connected to the common connection point between the resistor R26 and the sources of the NMOS tubes Q5 and Q4, the common connection point between the inductor L3 and the source of the NMOS tube Q5 is connected to the anode of the diode D9, the cathode of the diode D9 is connected to the drain of the NMOS tube Q5, The gate of the NMOS tube Q3 is connected to the 14th pin of the control chip U4, the gate of the NMOS tube Q4 is connected to the 16th pin of the control chip U4, the gate of the NMOS tube Q6 is connected to the 18th pin of the control chip U4, the gate of the NMOS tube Q5 is connected to the 23rd pin of the control chip U4, the common connection point of the NMOS tube Q3 and the inductor L3 is connected to the 15th pin of the control chip U4, and the source of the NMOS tube Q5 and the common connection point of the inductor L3 are connected to the 22nd pin of the control chip U4; The power supply switching circuit includes a control chip U6, a PMOS tube Q7, a PMOS tube Q8, a PMOS tube Q9, a PMOS tube Q10, a resistor R27 and a capacitor C29; The control chip U6 is LTC4412ES6, and pin 1 of the control chip U6 is grounded through a capacitor C29. The common connection point of the control chip U6 and the capacitor C29 is connected to a backup battery. The source electrodes of the PMOS tubes Q9 and Q10 are connected to the backup battery. The source electrodes of the PMOS tubes Q7 and Q8 are connected to the output end of the mains power supply module. The drain electrodes of the PMOS tubes Q7, Q8, Q9, and Q10 are connected to the input end of the voltage control circuit as the output end of the power supply switching circuit. Pins 2 and 3 of the control chip U6 are grounded, pin 8 of the control chip U6 is connected to the gates of PMOS tubes Q7 and Q8, pin 9 of the control chip U6 is connected to the gates of PMOS tubes Q9 and Q10, pin 10 of the control chip U6 is connected to the output end of the power supply switching circuit, and pin 8 of the control chip U6 is connected to the output end of the power supply switching circuit through a resistor R27; The voltage detection circuit includes a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C18, a PMOS tube Q2 and a transistor T1; The source of the PMOS tube Q2 is connected to the collector of the transistor T1 through the resistor R13, the gate of the PMOS tube Q2 is connected to the collector of the transistor T1 through the resistor R14, the source of the PMOS tube Q2 is connected to the backup battery, the drain of the PMOS tube Q2 is connected to the ground after being connected in series with the resistor R15 and the resistor R17, the common connection point between the resistor R15 and the resistor R17 is grounded through the capacitor C18, the common connection point between the resistor R15 and the resistor R17 is connected to the detection input end of the control circuit as the output end of the voltage detection circuit, the base of the transistor T1 is connected to one end of the resistor R16, the other end of the resistor R16 is connected to the control output end of the control circuit, the common connection point between the resistor R16 and the control output end of the control circuit is connected to the emitter of the transistor T1 through the resistor R18, and the emitter of the transistor T1 is grounded.

2. The intelligent power management system according to claim 1, characterized in that: It also includes a temperature control module; the temperature control module is used to detect the ambient temperature and the temperature signal of the power management system and to dissipate heat when the temperature exceeds the standard; The temperature control module includes a temperature sensor, a fan and a fan driving circuit; the temperature sensors are two sensors that respectively detect the ambient temperature signal and the temperature signal of the power management system and output them to the control circuit; The fan drive circuit has a control input end connected to the control circuit and is used to receive a control signal output by the control circuit to control the circuit conduction between the fan and the power supply when the ambient temperature or the temperature of the power management system exceeds the standard, thereby controlling the operation of the fan.

3. The intelligent power management system according to claim 1, characterized in that: The charging management circuit includes a charging voltage stabilization circuit and a charging control circuit; The charging voltage stabilizing circuit is used to convert the direct current output by the mains power supply module into 14.1V direct current and output it to the charging control circuit; The charging control circuit is used to detect the voltage of the backup battery, and to charge the backup battery when the voltage of the backup battery is less than or equal to the charging voltage threshold, and to output a charging detection signal to the control circuit.

4. The intelligent power management system according to claim 3, characterized in that: The charging voltage stabilizing circuit includes a diode D1, a diode D2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a control chip U3; The positive electrode of the diode D1 is connected to the output end of the mains power supply module, the negative electrode of the diode D1 is connected to the 2nd pin of the control chip U3, the 2nd pin of the control chip U3 is grounded through the capacitor C8, the 2nd pin of the control chip U3 is grounded through the capacitor C3, the common connection point between the capacitor C3 and the 2nd pin of the control chip U3 is connected in series with the resistor R1 and the resistor R2 and then grounded, the common connection point between the resistor R1 and the resistor R2 is connected to the 7th pin of the control chip U3, the 1st pin of the control chip U3 is connected to one end of the inductor L1 through the capacitor C5, and the other end of the inductor L1 is connected to the The 5th pin of the control chip U5 is connected to the common connection point of the inductor L1 and the capacitor C7 through the resistor R3, the 5th pin of the control chip U5 is grounded through the resistor R4, the common connection point of the inductor L1 and the capacitor C7 serves as the output end of the charging voltage stabilizing circuit, the 8th pin of the control chip U3 is grounded through the capacitor C4, the 6th pin of the control chip U3 is grounded after being connected in series with the capacitor C6 and the resistor R5, the 3rd pin of the control chip U3 is connected to the common connection point of the capacitor C5 and the inductor L1, the common connection point of the capacitor C5 and the inductor L1 is connected to the cathode of the diode D2, and the anode of the diode D2 is grounded.

5. The intelligent power management system according to claim 3, characterized in that: The charging control circuit includes a control chip U5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C14, a capacitor C15, an indicator light LED1, an indicator light LED2, a capacitor C16, a capacitor C17, a PMOS tube Q1, a diode D3, a diode D4, a diode D5, a diode D6 and an inductor L2; One end of the resistor R8 and the resistor R9 are both connected to the output end of the charging voltage stabilizing circuit, the other end of the resistor R8 is connected to the positive electrode of the indicator light LED1, the negative electrode of the indicator light LED1 is connected to the 4th pin of the control chip U5, the other end of the resistor R9 is connected to the positive electrode of the indicator light LED2, the negative electrode of the indicator light LED2 is connected to the 3rd pin of the control chip U5, the 1st pin of the control chip U5 is connected to the output end of the charging voltage stabilizing circuit through the capacitor C14, the 2nd pin of the control chip U5 is grounded, and the 5th pin of the control chip U5 is connected to the ground after being connected in series with the resistor R10 and the capacitor C15; one end of the resistor R6 is connected to the 5V power supply, the other end of the resistor R6 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is connected to the 3rd pin of the control chip U5, one end of the resistor R7 is connected to the 5V power supply, the other end of the resistor R7 is connected to the positive electrode of the diode D6, the negative electrode of the diode D6 is connected to the 4th pin of the control chip U5, and the positive electrode of the diode D5 and the positive electrode of the diode D6 are connected to the control circuit as the charging detection end; The source of the PMOS tube Q1 is connected to the output end of the charging voltage stabilizing circuit, and the source of the PMOS tube Q1 is also connected to the 9th pin of the control chip U5, and the 9th pin of the control chip U5 is grounded through the capacitor C17. The drain of the PMOS tube Q1 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to the negative electrode of the diode D4. The positive electrode of the diode D4 is grounded, and the negative electrode of the diode D3 is connected to one end of the resistor R12 through the inductor L2. The other end of the resistor R12 is grounded through the capacitor C16. The common connection point of the inductor L2 and the resistor R12 is connected to the 8th pin of the control chip U5, and the 7th pin of the control chip U5 is connected to the common connection point of the resistor R12 and the capacitor C16. The common connection point of the resistor R12 and the capacitor C16 is connected to the 6th pin of the control chip U5 through the resistor R11, and the 10th pin of the control chip U5 is connected to the gate of the PMOS tube Q1.

6. The intelligent power management system according to claim 2, characterized in that: The fan driving circuit includes a resistor R28, a resistor R29, a resistor R30, a resistor R31, a PMOS tube Q11 and a transistor T2; The source of the PMOS tube Q11 is connected to the collector of the transistor T2 through the resistor R28, the gate of the PMOS tube Q11 is connected to the collector of the transistor T2 through the resistor R29, the source of the PMOS tube Q11 is connected to the output end of the voltage control circuit, the drain of the PMOS tube Q11 is connected to the cathode of the diode D11, the anode of the diode D11 is grounded, the common connection point between the cathode of the diode D11 and the drain of the PMOS tube Q11 is connected to the power supply end of the fan as the output end of the fan driving circuit, the base of the transistor T2 is connected to one end of the resistor R30, the other end of the resistor R30 is connected to the control output end of the control circuit as the control end of the fan driving circuit, the common connection point between the resistor R30 and the control output end of the control circuit is connected to the emitter of the transistor T1 through the resistor R31, and the emitter of the transistor T2 is grounded.

7. The intelligent power management system according to claim 1, characterized in that: The communication circuit is an RS232 interface circuit composed of a chip MAX3232ESE+ and its peripheral circuits.

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