CN203205948U - 5V output portable power source - Google Patents

Abstract

The utility model discloses a mobile power supply with 5V output. The existing mobile power supply has limitations in outdoor use, low output power, and lack of complete protection devices, which may easily cause safety accidents. The power supply includes a lithium battery, a single-chip microcomputer control circuit, a charging circuit, a short-circuit protection circuit, a temperature and over-discharge protection circuit, a 5V output circuit, and a power display circuit; the first output end of the charging circuit is electrically connected to the input end of the lithium battery, and the second output end It is electrically connected to the input terminal of the single-chip control circuit, the input terminal of the short-circuit protection circuit is electrically connected to the output terminal of the lithium battery, the output terminal is connected to the signal of the input terminal of the temperature and over-discharge protection circuit, and the output terminal of the temperature and over-discharge protection circuit is connected to the input of the 5V output circuit Terminal signal connection, single-chip control circuit output terminal and power display circuit input signal connection, temperature and over-discharge protection circuit and single-chip control circuit signal connection, lithium battery and single-chip control circuit electrical connection. The power supply has multiple charging methods, and is safe and reliable.

Description

5V output mobile power supply

technical field

The utility model belongs to the field of mobile power supply technology, and relates to a 5V output mobile power supply, in particular to a mobile power supply mainly based on green solar energy charging, taking into account the charging input mode of the vehicle power supply and having a standard USB5V output.

Background technique

At present, the mobile power supply on the market is basically based on mains charging. This kind of mobile power supply has certain limitations when used outdoors. The output power is also small, generally only about 10W, which can only charge low-power electronic products such as mobile phones, MP3s, and PADs. Moreover, some mobile power supplies on the market lack complete protection devices such as overheating, overcurrent and undervoltage, which often lead to safety accidents caused by excessive temperature or excessive current of the mobile power supply, greatly reducing the service life of the mobile power supply.

Contents of the invention

The purpose of the utility model is to provide a 5V output mobile power supply for the deficiencies of the prior art.

The utility model comprises a lithium battery, a single-chip microcomputer control circuit, a charging circuit, a short-circuit protection circuit, a temperature and over-discharge protection circuit, a 5V output circuit, and a power display circuit; the first output end of the charging circuit is electrically connected to the input end of the lithium battery, and the second The two output ends are electrically connected to the input end of the single-chip microcomputer control circuit, the input end of the short-circuit protection circuit is electrically connected to the output end of the lithium battery, the output end is connected to the temperature and the input end signal of the over-discharge protection circuit, and the temperature and over-discharge protection circuit is connected. The output terminal is connected to the input terminal signal of the 5V output circuit, the output terminal of the single-chip microcomputer control circuit is connected to the input terminal signal of the power display circuit, the temperature and over-discharge protection circuit is connected to the signal of the single-chip microcomputer control circuit, and the lithium battery is electrically connected to the single-chip microcomputer control circuit.

The charging circuit includes a charging chip U1, a P-channel MOS field effect transistor Q1, an inductor L1, diodes D1-D2, capacitors C1-C9, and resistors R1-R7; the first pin of the charging chip U1 and the third capacitor C3 One end of the connection, the second pin is connected with the negative pole of the first capacitor C1, one end of the second capacitor C2, the fourth pin, the fifth pin, one end of the fourth resistor R4, the seventh pin, the third pin, the first One end of the sixth capacitor C6, one end of the seventh capacitor C7, one end of the eighth capacitor C8, one end of the fifth resistor R5, the negative pole of the fourth capacitor C4, one end of the fifth capacitor C5, and one end of the third resistor R3 are connected and connected Grounding, the 6th pin is connected to the other end of the fourth resistor R4, the 8th pin is connected to the other end of the seventh capacitor C7, the 9th pin is connected to one end of the seventh resistor R7, the 10th pin is connected to the ninth One end of the capacitor C9, one end of the sixth resistor R6, and one end of the fifth resistor R5 are connected, the 11th pin is connected to the other end of the sixth capacitor C6, the 13th pin is connected to one end of the first inductor L1, the first resistor R1 One end of the 14th pin is connected to the other end of the ninth capacitor C9, the other end of the sixth resistor R6, the other end of the first resistor R1, the positive pole of the fourth capacitor C4, the other end of the fifth capacitor C5, the second One end of the resistor R2 is connected to the input end of the lithium battery 1, and the 15th pin is connected to the positive electrode of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, and the P-channel MOS field effect transistor The drain of Q1 is connected to the power supply VCC, the 16th pin is connected to the gate of the P-channel MOS field-effect transistor Q1; the source of the P-channel MOS field-effect transistor Q1 is connected to the anode of the first diode D1, The cathode of the first diode D1 is connected to the cathode of the second diode D2 and the other end of the first inductor L1, the anode of the second diode D2 is grounded, and the other end of the seventh resistor R7 is connected to the eighth capacitor C8. The other end is connected, and the other end of the second resistor R2 is connected to the other end of the third resistor R3 as the output terminal Vbat-Samp of the charging circuit; the first diode D1 and the second diode D2 are Schott The base diode, the first capacitor C1 and the fourth capacitor C4 are electrolytic capacitors, the sixth capacitor C6 and the eighth capacitor C8 are ceramic capacitors, the fourth resistor R4 is a negative thermistor, and the model of the charging chip U1 is CN3705;

Described lithium battery voltage is 12V, adopts the 3.7V lithium battery that can buy on the existing market, and three sections are connected in series.

The short circuit protection circuit includes a current overload protector F1; the first pin of the current overload protector F1 is connected to the output terminal of the lithium battery, and the second pin is used as the output terminal Vbat2 of the short circuit protection circuit 4;

The temperature and over-discharge protection circuit includes a relay Relay, a MOS tube Q2, a diode D3, and a resistor R8; the first pin of the relay Relay is connected to the third pin, and the cathode of the third diode D3 is connected to the short-circuit protection circuit The output terminal Vbat2 is connected, the second pin is connected to the anode of the third diode D3 and the drain of the MOS transistor Q2, the third pin is connected to the fifth pin of the normally closed contact, the fourth pin is suspended, and the Pin 5 is used as the output terminal Vmain of the temperature and over-discharge protection circuit; the gate of the MOS transistor Q2 is connected to one end of the eighth resistor R8, the source is grounded, and the other end of the eighth resistor R8 is used as the signal of the temperature and over-discharge protection circuit Terminal Control;

The 5V output circuit includes a second chip U2, a diode D4, an inductor L2, a terminal P1, capacitors C10-C11, and resistors R9-R12; the first pin of the second chip U2 is connected to the output end of the temperature and over-discharge protection circuit Vmain is connected, the second pin is connected to the cathode of the fourth diode D4, one end of the second inductor L2, the third pin is connected to the fifth pin, the anode of the fourth diode D4, and the negative pole of the tenth capacitor C10 1. One end of the eleventh capacitor C11 is connected to ground, the fourth pin is connected to the other end of the second inductor L2, the positive pole of the tenth capacitor C10, the other end of the eleventh capacitor C11, one end of the tenth resistor R10, the tenth One end of a resistor R11 is connected to the second pin of the first terminal P1; the other end of the tenth resistor R10 is connected to one end of the ninth resistor R9 and the first pin of the first terminal P1, and the other end of the eleventh resistor R11 One end is connected to one end of the twelfth resistor R12 and the third pin of the first terminal P1, the other end of the ninth resistor R9 and the other end of the twelfth resistor R12 are both grounded; the second pin of the first terminal P1 serves as 5V output interface; the model of the second chip U2 is LM2576;

The single-chip microcomputer control circuit includes a single-chip microcomputer chip U3, an operational amplifier U4, resistors R13-R17, and capacitors C12-C14; the first pin of the single-chip microcomputer chip U3 is connected to the power supply VCC, and the second pin is used as the first output terminal of the single-chip microcomputer control circuit LED100﹪, the 3rd pin is used as the second output terminal LED75﹪ of the single-chip microcomputer control circuit 2, the 4th pin is connected with one end of the fourteenth resistor R14 and one end of the fourteenth capacitor C14, and the sixth pin is connected with temperature and over The signal terminal Control of the amplifier protection circuit is connected, the 7th pin is connected with one end of the twelfth capacitor C12, the 1st pin of the operational amplifier U4, and the 2nd pin of the operational amplifier U4, and the 10th pin is connected with the thirteenth capacitor One end of C13, the 5th pin of the operational amplifier U4, and the 7th pin of the operational amplifier U4 are connected, the 11th pin is used as the third output terminal LED50﹪ of the single-chip microcomputer control circuit, and the 12th pin is used as the fourth output terminal of the single-chip microcomputer control circuit The output terminal LED25﹪, the 14th pin is grounded, the 5th, 8th, 9th, and 13th pins are suspended; the 3rd pin of the operational amplifier U4 is connected to one end of the thirteenth resistor R13, the 4th pin is grounded, and the 6th pin The pin is connected to one end of the fifteenth resistor R15, and the eighth pin is electrically connected to the lithium battery; the other end of the thirteenth resistor R13 is connected to the output terminal Vbat-Samp of the charging circuit, and the other end of the fifteenth resistor R15 is connected to the first One end of the sixteenth resistor R16 and one end of the seventeenth resistor R17 are connected, the other end of the sixteenth resistor R16 and the other end of the fourteenth resistor R14 are connected to the power supply VCC, the other end of the twelfth capacitor C12, the thirteenth The other end of the capacitor C13, the other end of the fourteenth capacitor C14, and the other end of the seventeenth resistor R17 are all grounded; the model of the single-chip microcomputer chip U5 is PIC16F616T-I/SL, and the model of the first operational amplifier U6 is LM358 , the twenty-sixth resistor R26 is a negative thermistor;

The power display circuit includes resistors R18-R21 and light-emitting diodes LED1-LED4; one end of the eighteenth resistor R18 is connected to the fourth output terminal LED25﹪ of the single-chip microcomputer control circuit, and the other end is connected to the anode of the first light-emitting diode LED1, One end of the nineteenth resistor R19 is connected to the third output terminal LED50﹪ of the single-chip microcomputer control circuit, the other end is connected to the anode of the second light-emitting diode LED2, and one end of the twentieth resistor R20 is connected to the second output terminal LED75﹪ of the single-chip microcomputer control circuit connected, the other end is connected with the anode of the third light emitting diode LED3, one end of the twentieth resistor R20 is connected with the first output end LED100% of the single-chip microcomputer control circuit 2, and the other end is connected with the anode of the fourth light emitting diode LED4, the first light emitting The cathode of the diode LED1 is connected to the cathode of the second light emitting diode LED2, the cathode of the third light emitting diode LED3, and the cathode of the fourth light emitting diode LED4, and then grounded.

The beneficial effects of the utility model are:

The utility model has a variety of charging methods, which can not only adopt the current popular clean energy solar charging, but also effectively alleviate the current situation of resource and energy shortage and serious environmental pollution. In the case of natural factors, we can also use convenient vehicle-mounted Power charging, convenient for outdoor use. In order to realize solar charging and adapt to the problem of wide output voltage of solar panels, a lithium battery charging chip with an input range of 12-28V is used, and it is also compatible with the direct input of 12/24V on-board power supply. The utility model adopts a buck circuit topological structure, solves the problem that the output voltage of the solar panel varies greatly, and stabilizes the charging current and voltage. The utility model adopts a standard USB5V output, and the maximum power can reach 10W, and can charge low-power electronic products such as mobile phones, MP3s, and PADs. In order to make the circuit safer, the utility model adds three kinds of protections: overcurrent, overheating and overdischarge. When the current exceeds the set 8 A, the overload protector shuts off the circuit to prevent the current from continuing to increase and perform overcurrent protection; When the temperature exceeds 65 degrees Celsius, the single-chip microcomputer control circuit shuts down the circuit to prevent the temperature from continuing to rise and perform temperature protection; when the lithium battery voltage is lower than the set 8.5 V, the single-chip microcomputer chip U3 passes through the sampling circuit, op-amp comparator and other circuits Turn off the lithium battery, stop its continuous discharge to the outside, and perform over-discharge protection.

Description of drawings

Figure 1 is a schematic diagram of the system structure of the utility model circuit;

Fig. 2 is the circuit diagram of charging circuit;

Fig. 3 is the circuit diagram of short circuit protection circuit;

Fig. 4 is the circuit diagram of temperature and over-discharge protection circuit;

Fig. 5 is the circuit diagram of 5V output circuit;

Fig. 6 is the circuit diagram of single-chip microcomputer control circuit;

Fig. 7 is a circuit diagram of the power display circuit.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, the utility model comprises a lithium battery 1, a single-chip microcomputer control circuit 2, a charging circuit 3, a short circuit protection circuit 4, a temperature and an over-discharge protection circuit 5, a 5V output circuit 6, and a power display circuit 7; The first output end is electrically connected to the input end of the lithium battery 1, the second output end is electrically connected to the input end of the single-chip microcomputer control circuit 2, the input end of the short circuit protection circuit 4 is electrically connected to the output end of the lithium battery 1, and the output end is connected to the temperature. It is connected with the input terminal signal of the over-discharge protection circuit 5, the temperature and the output terminal of the over-discharge protection circuit 5 are connected with the input terminal signal of the 5V output circuit 6, and the output terminal of the single-chip microcomputer control circuit 2 is connected with the input terminal signal of the power display circuit 7 , the temperature and over-discharge protection circuit 5 is signal-connected with the single-chip microcomputer control circuit 2, and the lithium battery 1 is electrically connected with the single-chip microcomputer control circuit 2.

As shown in Figure 2, the charging circuit 3 includes a charging chip U1, a P-channel MOS field effect transistor Q1, an inductor L1, diodes D1-D2, capacitors C1-C9, and resistors R1-R7; The pin is connected to one end of the third capacitor C3, the second pin is connected to the negative pole of the first capacitor C1, one end of the second capacitor C2, the fourth pin, the fifth pin, one end of the fourth resistor R4, and the seventh pin , the third pin, one end of the sixth capacitor C6, one end of the seventh capacitor C7, one end of the eighth capacitor C8, one end of the fifth resistor R5, the negative pole of the fourth capacitor C4, one end of the fifth capacitor C5, the third One end of the resistor R3 is connected to ground, the sixth pin is connected to the other end of the fourth resistor R4, the eighth pin is connected to the other end of the seventh capacitor C7, the ninth pin is connected to one end of the seventh resistor R7, The 10th pin is connected to one end of the ninth capacitor C9, one end of the sixth resistor R6, and one end of the fifth resistor R5, the 11th pin is connected to the other end of the sixth capacitor C6, and the 13th pin is connected to the first inductor L1 One end of the first resistor R1 is connected, the 14th pin is connected to the other end of the ninth capacitor C9, the other end of the sixth resistor R6, the other end of the first resistor R1, the positive pole of the fourth capacitor C4, the fifth capacitor The other end of C5 and one end of the second resistor R2 are connected to the input end of the lithium battery 1, and the 15th pin is connected to the positive pole of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, The drain of the P-channel MOS field effect transistor Q1 is connected to the power supply VCC, and the 16th pin is connected to the gate of the P-channel MOS field effect transistor Q1; the source of the P-channel MOS field effect transistor Q1 is connected to the first two The anode of the pole tube D1 is connected, the cathode of the first diode D1 is connected with the cathode of the second diode D2 and the other end of the first inductor L1, the anode of the second diode D2 is grounded, and the other end of the seventh resistor R7 One end is connected to the other end of the eighth capacitor C8, and the other end of the second resistor R2 is connected to the other end of the third resistor R3 as the output terminal Vbat-Samp of the charging circuit 3; the first diode D1, the second The second diode D2 is a Schottky diode, the first capacitor C1 and the fourth capacitor C4 are electrolytic capacitors, the sixth capacitor C6 and the eighth capacitor C8 are ceramic capacitors, the fourth resistor R4 is a negative thermistor, and the charging chip The model of U1 is CN3705;

Described lithium battery 1 voltage is 12V, adopts the 3.7V lithium battery that can buy on the existing market, and three sections are connected in series.

As shown in Figure 3, the short-circuit protection circuit 4 includes a current overload protector F1; the first pin of the current overload protector F1 is connected to the output end of the lithium battery, and the second pin is used as the output end Vbat2 of the short-circuit protection circuit 4;

As shown in Figure 4, the temperature and over-discharge protection circuit 5 includes a relay Relay, a MOS tube Q2, a diode D3, and a resistor R8; the first pin and the third pin of the relay Relay, the third pin, and the third diode D3 After the cathode is connected, it is connected to the output terminal Vbat2 of the short circuit protection circuit 4, the second pin is connected to the anode of the third diode D3 and the drain of the MOS transistor Q2, and the third pin is connected to the fifth pin of the normally closed contact , the fourth pin is suspended, the fifth pin is used as the output terminal Vmain of the temperature and over-discharge protection circuit 5; the gate of the MOS transistor Q2 is connected to one end of the eighth resistor R8, the source is grounded, and the other end of the eighth resistor R8 Serve as the signal terminal Control of the temperature and over-discharge protection circuit 5;

As shown in Figure 5, the 5V output circuit includes a second chip U2, a diode D4, an inductor L2, a terminal P1, capacitors C10-C11, and resistors R9-R12; the first pin of the second chip U2 is connected to the temperature and The output terminal Vmain of the discharge protection circuit 5 is connected, the second pin is connected to the cathode of the fourth diode D4, and one end of the second inductor L2, and the third pin is connected to the fifth pin and the anode of the fourth diode D4 , the negative pole of the tenth capacitor C10, one end of the eleventh capacitor C11 are connected to ground, the fourth pin is connected to the other end of the second inductor L2, the positive pole of the tenth capacitor C10, the other end of the eleventh capacitor C11, the tenth One end of the resistor R10, one end of the eleventh resistor R11, and the second pin of the first terminal P1 are connected; the other end of the tenth resistor R10 is connected to one end of the ninth resistor R9, and the first pin of the first terminal P1, The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the third pin of the first terminal P1, the other end of the ninth resistor R9 and the other end of the twelfth resistor R12 are both grounded; the first terminal The second pin of P1 is used as a 5V output interface; the model of the second chip U2 is LM2576;

As shown in Fig. 6, described single-chip microcomputer control circuit 2 comprises single-chip microcomputer chip U3, operational amplifier U4, resistance R13～R17, electric capacity C12～C14; The first output terminal LED100﹪ of the control circuit 2, the third pin is used as the second output terminal LED75﹪ of the single-chip microcomputer control circuit 2, the fourth pin is connected to one end of the fourteenth resistor R14 and one end of the fourteenth capacitor C14, The sixth pin is connected to the signal terminal Control of the temperature and over-discharge protection circuit 5, the seventh pin is connected to one end of the twelfth capacitor C12, the first pin of the operational amplifier U4, and the second pin of the operational amplifier U4, The 10th pin is connected with one end of the thirteenth capacitor C13, the 5th pin of the operational amplifier U4, and the 7th pin of the operational amplifier U4, and the 11th pin is used as the third output terminal LED50% of the single-chip microcomputer control circuit 2. The 12th pin is used as the fourth output terminal LED25﹪ of the single-chip microcomputer control circuit 2, the 14th pin is grounded, and the 5th, 8th, 9th, and 13th pins are suspended; the third pin of the operational amplifier U4 is connected to one end of the thirteenth resistor R13 connection, the 4th pin is grounded, the 6th pin is connected to one end of the fifteenth resistor R15, the eighth pin is electrically connected to the lithium battery 1; the other end of the thirteenth resistor R13 is connected to the output terminal Vbat- of the charging circuit 3 Samp connection, the other end of the fifteenth resistor R15 is connected to one end of the sixteenth resistor R16 and one end of the seventeenth resistor R17, the other end of the sixteenth resistor R16 and the other end of the fourteenth resistor R14 are both connected to the power supply VCC , the other end of the twelfth capacitor C12, the other end of the thirteenth capacitor C13, the other end of the fourteenth capacitor C14, and the other end of the seventeenth resistor R17 are all grounded; the model of the single-chip microcomputer chip U5 is PIC16F616T- I/SL, the model of the first operational amplifier U6 is LM358, and the twenty-sixth resistor R26 is a negative thermistor;

As shown in Figure 7, the electric power display circuit 7 includes resistors R18-R21 and light-emitting diodes LED1-LED4; one end of the eighteenth resistor R18 is connected to the fourth output end LED25﹪ of the single-chip microcomputer control circuit 2, and the other end is connected to the fourth output end LED25﹪ of the single-chip microcomputer control circuit 2. The anode of a light-emitting diode LED1 is connected, one end of the nineteenth resistor R19 is connected with the third output terminal LED50% of the single-chip microcomputer control circuit 2, the other end is connected with the anode of the second light-emitting diode LED2, and one end of the twentieth resistor R20 is connected with the single-chip microcomputer The second output terminal LED75﹪ of the control circuit 2 is connected, the other end is connected with the anode of the third light-emitting diode LED3, one end of the twentieth resistor R20 is connected with the first output terminal LED100﹪ of the single-chip microcomputer control circuit 2, and the other end is connected with the fourth The anode of the light-emitting diode LED4 is connected, the cathode of the first light-emitting diode LED1 is connected with the cathode of the second light-emitting diode LED2, the cathode of the third light-emitting diode LED3, and the cathode of the fourth light-emitting diode LED4, and then grounded.

work process:

The working process of the temperature and over-discharge protection circuit 5 is that when the temperature of the circuit board exceeds 65 degrees Celsius when charging the electronic product, the single-chip microcomputer chip U3 will control the relay to turn off the output circuit, so that the circuit board stops working and prevents the temperature from rising further. The single-chip microcomputer control circuit 2 works automatically when the temperature returns below 65 degrees Celsius. When the remaining power of the lithium battery 1 is lower than 8.5V, the microcontroller control circuit 2 detects that the remaining power of the lithium battery 1 is too low through the sampling resistor network, and automatically controls the relay to turn off the discharge circuit to prevent the lithium battery 1 from over-discharging.

A negative thermistor R4 is added to the charging circuit 3 to detect the temperature when charging the lithium battery 1. When the temperature exceeds 45 degrees Celsius, the charging circuit 3 stops working to prevent the temperature from rising further. When the temperature drops below 45 degrees Celsius, continue charging.

The short-circuit protection circuit 4 adopts a current overload protector F1. When the circuit current exceeds 10 amps (A), the current overload protector F1 will automatically trip off and cut off the circuit to prevent short circuit or excessive current from burning the circuit board and lithium battery 1; After a short-circuit fault, the button of the current overload protector F1 can be pressed, and the circuit works normally.

The working process of the 5V output circuit is that the first pin of the second chip U2 is connected to the output terminal Vmain of the temperature and over-discharge protection circuit 5 to provide voltage for the second chip U2, and through the BUCK topology step-down circuit, the first terminal P1 The second pin is used as the output terminal 5V-OUT of the 5V output circuit, and the model of the second chip U2 is LM2576; the 5V output terminal 5V-OUT uses a USB interface, and the electronic product is connected to the USB with a charging cable Interface, you can charge mobile phones, MP/3/4/5 and other electronic products.

The working process of the power display circuit is that when the utility model is charged to 25%, light the first light-emitting diode LED1; when the utility model is charged to 50%, light the second light-emitting diode LED2, and the first light-emitting diode LED1 is constant Bright; when the utility model is charged to 75%, light the third light-emitting diode LED3, and the first light-emitting diode LED1, the second light-emitting diode LED2 constant bright; when the utility model is charged to 100%, light the fourth light-emitting diode The diode LED4, and the first light emitting diode LED1, the second light emitting diode LED2, and the third light emitting diode LED3 are always on.

Claims (1)

1.5V the output mobile power supply is characterized in that this portable power source comprises lithium battery, single chip machine controlling circuit, charging circuit, short-circuit protection circuit, temperature and over-discharge protection circuit, 5V output circuit, electric quantity display circuit; The first output of charging circuit is electrically connected with the input of lithium battery, the second output is electrically connected with the input of single chip machine controlling circuit, the input of short-circuit protection circuit is electrically connected with the output of lithium battery, output and temperature are connected input end signal and are connected with over-discharge protection circuit, temperature is connected output and is connected with the input end signal of 5V output circuit with over-discharge protection circuit, the output of single chip machine controlling circuit is connected with the input end signal of electric quantity display circuit, temperature is connected with the single chip machine controlling circuit signal with over-discharge protection circuit, and lithium battery is electrically connected with single chip machine controlling circuit;

Described charging circuit comprises charging chip U1, P channel MOS field-effect transistor Q1, inductance L 1, diode D1～D2, capacitor C 1～C9, resistance R 1～R7; The 1st pin of charging chip U1 is connected with an end of the 3rd capacitor C 3, the negative pole of the 2nd pin and the first capacitor C 1, one end of the second capacitor C 2, the 4th pin, the 5th pin, one end of the 4th resistance R 4, the 7th pin, the 3rd pin, one end of the 6th capacitor C 6, one end of the 7th capacitor C 7, one end of the 8th capacitor C 8, one end of the 5th resistance R 5, the negative pole of the 4th capacitor C 4, one end of the 5th capacitor C 5, one end of the 3rd resistance R 3 connects rear and ground connection, the 6th pin is connected with the other end of the 4th resistance R 4, the 8th pin is connected with the other end of the 7th capacitor C 7, the 9th pin is connected with an end of the 7th resistance R 7, one end of the 10th pin and the 9th capacitor C 9, one end of the 6th resistance R 6, one end of the 5th resistance R 5 connects, the 11st pin is connected with the other end of the 6th capacitor C 6, one end of the 13rd pin and the first inductance L 1, one end of the first resistance R 1 connects, the other end of the 14th pin and the 9th capacitor C 9, the other end of the 6th resistance R 6, the other end of the first resistance R 1, the positive pole of the 4th capacitor C 4, the other end of the 5th capacitor C 5, one end of the second resistance R 2 is connected with the input of lithium battery 1 after connecting, the positive pole of the 15th pin and the first capacitor C 1, the other end of the second capacitor C 2, the other end of the 3rd capacitor C 3, the drain electrode of P channel MOS field-effect transistor Q1 meets power supply VCC after connecting, and the 16th pin is connected with the grid of P channel MOS field-effect transistor Q1; The source electrode of P channel MOS field-effect transistor Q1 and the anodic bonding of the first diode D1, the negative electrode of the first diode D1 is connected with the negative electrode of the second diode D2, the other end of the first inductance L 1, the plus earth of the second diode D2, the other end of the 7th resistance R 7 is connected with the other end of the 8th capacitor C 8, and the other end of the second resistance R 2 is connected rear output Vbat-Samp as charging circuit with the other end of the 3rd resistance R 3; Described the first diode D1, the second diode D2 are Schottky diode, the first capacitor C 1, the 4th capacitor C 4 are electrochemical capacitor, the 6th capacitor C 6, the 8th capacitor C 8 are ceramic disc capacitor, and the 4th resistance R 4 is negative thermistor, and the model of charging chip U1 is CN3705;

Described lithium battery voltage is 12V, adopts the 3.7V lithium battery that can buy on the existing market, and three joints are in series;

Described short-circuit protection circuit comprises current over-load protector F1; The 1st pin of current over-load protector F1 is connected with the output of lithium battery, and the 2nd pin is as the output Vbat2 of short-circuit protection circuit 4;

Described temperature and over-discharge protection circuit comprise relay R elay, metal-oxide-semiconductor Q2, diode D3, resistance R 8; After being connected with the negative electrode of the 3rd pin, the 3rd diode D3, the 1st pin of relay R elay is connected with the output Vbat2 of short-circuit protection circuit, the 2nd pin is connected with the anode of the 3rd diode D3, the drain electrode of metal-oxide-semiconductor Q2, the 3rd pin is connected with normally-closed contact the 5th pin, the 4th pin is unsettled, and the 5th pin is as the output Vmain of temperature and over-discharge protection circuit; The grid of metal-oxide-semiconductor Q2 is connected with an end of the 8th resistance R 8, source ground, and the other end of the 8th resistance R 8 is as the signal end Control of temperature and over-discharge protection circuit;

Described 5V output circuit comprises the second chip U2, diode D4, inductance L 2, terminals P 1, capacitor C 10～C11, resistance R 9～R12; The 1st pin of the second chip U2 and temperature are connected output Vmain and are connected with over-discharge protection circuit, the 2nd pin is connected with the negative electrode of the 4th diode D4, an end of the second inductance L 2, the 3rd pin is connected rear ground connection with the anode of the 5th pin, the 4th diode D4, the negative pole of the tenth capacitor C 10, an end of the 11 capacitor C 11, and the 4th pin is connected with the other end of the second inductance L 2, the positive pole of the tenth capacitor C 10, the other end of the 11 capacitor C 11, an end of the tenth resistance R 10, an end of the 11 resistance R 11, the 2nd pin of the first terminal P1; The other end of the tenth resistance R 10 is connected with an end of the 9th resistance R 9, the 1st pin of the first terminal P1, the other end of the 11 resistance R 11 is connected with an end of the 12 resistance R 12, the 3rd pin of the first terminal P1, the equal ground connection of the other end of the other end of the 9th resistance R 9, the 12 resistance R 12; The 2nd pin of the first terminal P1 is as the 5V output interface; The model of described the second chip U2 is LM2576;

Described single chip machine controlling circuit comprises singlechip chip U3, operational amplifier U4, resistance R 13～R17, capacitor C 12～C14; The 1st pin of singlechip chip U3 meets power supply VCC, the 2nd pin is as the first output LED100 ﹪ of single chip machine controlling circuit, the 3rd pin is as the second output LED75 ﹪ of single chip machine controlling circuit 2, one end of the 4th pin and the 14 resistance R 14, one end of the 14 capacitor C 14 connects, the 6th pin and temperature are connected signal end Control and are connected with over-discharge protection circuit, one end of the 7th pin and the 12 capacitor C 12, the 1st pin of operational amplifier U4, the 2nd pin of operational amplifier U4 connects, one end of the 10th pin and the 13 capacitor C 13, the 5th pin of operational amplifier U4, the 7th pin of operational amplifier U4 connects, the 11st pin is as the 3rd output LED50 ﹪ of single chip machine controlling circuit, the 12nd pin is as the 4th output LED25 ﹪ of single chip machine controlling circuit, the 14th pin ground connection, the 5th, 8,9,13 pins are unsettled; The 3rd pin of operational amplifier U4 is connected with an end of the 13 resistance R 13, the 4th pin ground connection, and the 6th pin is connected with an end of the 15 resistance R 15, and the 8th pin is connected with lithium battery; The other end of the 13 resistance R 13 is connected with the output Vbat-Samp of charging circuit, the other end of the 15 resistance R 15 is connected with an end of the 16 resistance R 16, an end of the 17 resistance R 17, the other end of the 16 resistance R 16, the other end of the 14 resistance R 14 all meet power supply VCC, the other end of the 12 capacitor C 12, the other end of the 13 capacitor C 13, the other end of the 14 capacitor C 14, the equal ground connection of the other end of the 17 resistance R 17; The model of described singlechip chip U5 is PIC16F616T-I/SL, and the model of the first operational amplifier U6 is LM358, and the 26 resistance R 26 is negative thermistor;

Described electric quantity display circuit comprises resistance R 18～R21, LED 1～LED4; One end of the 18 resistance R 18 is connected with the 4th output LED25 ﹪ of single chip machine controlling circuit, the anodic bonding of the other end and the first LED 1, one end of the 19 resistance R 19 is connected with the 3rd output LED50 ﹪ of single chip machine controlling circuit, the anodic bonding of the other end and the second LED 2, one end of the 20 resistance R 20 is connected with the second output LED75 ﹪ of single chip machine controlling circuit, the anodic bonding of the other end and the 3rd LED 3, one end of the 20 resistance R 20 is connected with the first output LED100 ﹪ of single chip machine controlling circuit 2, the anodic bonding of the other end and the 4th LED 4, the negative electrode of the negative electrode of the first LED 1 and the second LED 2, the negative electrode of the 3rd LED 3, ground connection after the negative electrode of the 4th LED 4 connects.

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