CN204633412U - A mobile power supply with car start function - Google Patents

Abstract

The utility model discloses a mobile power supply with an automobile starting function, which comprises a power input module, a charging circuit, a battery core protection circuit, a battery core, a DC-DC step-down circuit, and an MCU controller; the power input module and one end of the MCU controller Electrically connected, the other end of the MCU controller is electrically connected to the charging circuit and the DC-DC step-down circuit, the charging circuit is electrically connected to the cell protection circuit, and the cell protection circuit is electrically connected to the cell; the power input module provides Energy, the charging circuit charges the battery with constant voltage and constant current through the battery protection circuit, the battery protection circuit realizes the overcharge, overdischarge, short circuit and overcurrent protection of the battery, the battery is used for energy storage, and the DC-DC step-down The piezoelectric circuit is controlled by the MCU controller. The utility model is light in weight and small in size, can be grasped by one hand, is easy to carry around, can start the car many times, and also has the function of mobile power supply, which can charge various digital products such as mobile phones and notebooks, and the lighting lamp has a flashing function.

Description

A mobile power supply with car start function

technical field

The utility model relates to a DC-to-DC circuit, in particular to a mobile power supply circuit with a high-rate lithium polymer battery and a high-conversion rate DC-to-DC.

Background technique

With the progress of social development, more and more people own their own cars. Cars are very popular in today's society. As a new type of transportation, it brings great convenience to people's travel. The technology of the car is already very mature, but it is not perfect in some aspects. With the increasing number of car ownership and usage rate, it is inevitable that the battery will lose power during the use of the car. For example, when the car is parked for a long time or the equipment in the car is forgotten to turn off the car, the battery will not start the car due to the power loss. The traditional lead-acid battery What the car emergency starting power supply of class adopts is the maintenance-free type lead-acid battery, and mass and volume are all bigger, and are not easy to carry. In order to provide convenience, a portable and durable car emergency mobile power supply came into being. The high-rate lithium polymer battery can instantly provide a large current to start the car.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art and provide a mobile power supply for emergency starting of automobiles. With the function of mobile power supply, the power supply can also charge various digital products such as mobile phones and notebooks, and the lighting has a flashing function.

The technical scheme that the utility model solves its technical problem adopts is:

The mobile power supply of the automobile starting function includes a power input module, a charging circuit, a battery cell protection circuit, a battery cell, a DC-DC step-down circuit, and an MCU controller; the power input module is electrically connected to one end of the MCU controller, and the The other end of the MCU controller is electrically connected to the charging circuit and the DC-DC step-down circuit, the charging circuit is electrically connected to the cell protection circuit, and the cell protection circuit is connected to the cell circuit. connection; the power input module provides energy for charging, the charging circuit charges the battery with constant voltage and constant current through the battery protection circuit, and the battery protection circuit realizes the over-voltage protection of the battery charging, over-discharging, short-circuit, and over-current protection, the battery is used for energy storage, and the DC-DC step-down circuit is controlled by the MCU controller. The utility model is light in weight and small in size, can be grasped by one hand, is convenient to carry around, can start the car multiple times, and also has the function of mobile power supply, which can charge various digital products such as mobile phones and notebooks, and the lighting lamp has a flashing function.

Further, it also includes a 12V output circuit electrically connected to the battery core, and a 12V output interface electrically connected to the 12V output circuit.

Further, it also includes a 5V step-down circuit electrically connected to the DC-DC step-down circuit, and a 5V output interface electrically connected to the 5V step-down circuit.

Further, the 5V output interface is a USB interface.

Further, the power input module and the charging circuit are composed of D5, MOS transistor Q3, single-chip microcomputer U1, inductor L2, freewheeling diode D6, filter capacitor C16, and R5. The single-chip microcomputer U1 detects the charging current through R5 and outputs it through pin 14 The PWM signal drives Q3 to work in the switch state, and the cooperation of the energy storage inductance L2 and the freewheeling diode D6 realizes the constant voltage and constant current charging of the battery core, and at the same time, the MCU controller is connected to the microcontroller U1 through R21, R22, and R23. Pin 11 checks the current charging status of the battery.

Further, the cell protection circuit consists of U2 and two dual MOS transistors U5, U2 monitors the cell voltage and current flowing through to control U5 to realize overcharge, overdischarge, short circuit and overcurrent protection.

Further, the DC-DC step-down circuit is composed of chip U3, inductor L1, filter capacitor C8, output voltage sampling feedback resistors R40, R35 and U1, U3 and inductor L2 realize the function of synchronous rectification and step-down, and C8 filters out output impurities wave, stabilize the output voltage; single-chip U1 detects the status of the discharge output through R40 and R35.

Further, the MCU controller is composed of single-chip microcomputer U1, button S1, four-segment power display LED25-LED100, and lighting flashlight D7. The single-chip microcomputer U1 is the core main control IC, which realizes key recognition, four-segment power indication drive control, D7 lighting or Strobe control, input voltage detection, output current detection, cell voltage detection, logic coordination control of the overall scheme.

Further, the button identification is composed of R26 and P20 pin of U1, the four-segment power display is composed of LED25, LED50, LED75, LED100, R25, P17, P18, P19 pin of U1, the lighting of the LED lamp and The strobe function is realized by D7, R43, Q4 and P15 pin of U1.

Further, the input voltage is divided by R27 and R29, filtered by R28 and C16 and connected to the P1 pin of U1 for detection; the output current is sampled by R32, filtered by R9 and C7, and connected to the P12 pin of U1 for detection; The core is divided by R21 and R22, filtered by R23 and C14, and connected to the P11 pin of U1 for detection.

Compared with the prior art, the mobile power supply of the utility model automobile starting function has the following advantages:

Light in weight and small in size, it can be grasped in one hand, easy to carry around, can start the car multiple times, and also has the function of mobile power supply, which can charge various mobile phones, notebooks and other digital products, and the lighting has a strobe function.

Description of drawings

Fig. 1 is the working structure block diagram of the present utility model;

Fig. 2 is the working principle circuit diagram of the utility model.

The main component symbols are explained as follows:

1. Power input module 2. Charging circuit

3. Cell protection circuit 4. Cell

5. DC-DC step-down circuit 6. MCU controller

Detailed ways

Below in conjunction with the embodiment that accompanying drawing provides, the utility model is described in further detail.

As shown in Fig. 1 and Fig. 2, the mobile power supply implementing the described automobile starting function includes a power input module 1, a charging circuit 2, a cell protection circuit 3, a cell 4, a DC-DC step-down circuit 5, and an MCU control circuit. 6; the power input module 1 is electrically connected to one end of the MCU controller 6, and the other end of the MCU controller 6 is electrically connected to the charging circuit 2 and the DC-DC step-down circuit 5 respectively, and the charging circuit 2 is electrically connected to the cell protection circuit 3, The cell protection circuit 3 is electrically connected to the cell 4; the power input module 1 provides energy for charging, and the charging circuit 2 charges the cell 4 with a constant voltage and constant current through the cell protection circuit 3, and the cell protection circuit 3 realizes charging of the cell 4. Cell 4 is protected against overcharge, overdischarge, short circuit, and overcurrent, cell 4 is used for energy storage, and DC-DC step-down circuit 5 is controlled by MCU controller 6 .

Further, it also includes a 12V output circuit electrically connected to the battery cell 4, and a 12V output interface electrically connected to the 12V output circuit.

Further, it also includes a 5V step-down circuit electrically connected to the DC-DC step-down circuit 5, and a 5V output interface electrically connected to the 5V step-down circuit, and outputs a voltage of 5 volts to support charging of mobile products such as various devices, Increased the wide application of life.

Further, the 5V output interface is a USB interface.

Further, the power input module 1 and the charging circuit 2 are composed of D5, MOS tube Q3, single-chip microcomputer U1, inductor L2, freewheeling diode D6, filter capacitor C16, and R5. The single-chip microcomputer U1 detects the charging current through R5, and outputs a PWM signal through pin 14 Drive Q3 to work in the switch state, and the cooperation of the energy storage inductor L2 and the freewheeling diode D6 realizes the constant voltage and constant current charging of the battery cell 4. At the same time, the MCU controller 6 is connected to the 11 pin of the single chip microcomputer U1 through R21, R22, and R23. The current charging status of the battery cell, whether it is fully charged, and whether there is a fault in charging.

Furthermore, the battery cell 4 can not only provide energy for the mobile power supply, but also output 12V voltage for starting the car.

Further, the cell protection circuit 3 is composed of U2 and two dual MOS transistors U5. U2 monitors the voltage and current of the cell 4 to control U5 to realize overcharge, overdischarge, short circuit and overcurrent protection.

Further, the DC-DC step-down circuit 5 is composed of chip U3, inductor L1, filter capacitor C8, output voltage sampling feedback resistors R40, R35 and U1, U3 and inductor L2 realize synchronous rectification and step-down function, and C8 filters output clutter , to stabilize the output voltage; the microcontroller U1 detects the status of the discharge output through R40 and R35, whether it is over-current, whether the device is fully charged, etc.

Further, the MCU controller 6 is composed of single-chip microcomputer U1, button S1, four-segment power display LED25-LED100, and lighting flashlight D7. Flash control, input voltage detection, output current detection, battery cell voltage detection, logic coordination control of the overall scheme, MCU controller 6 coordinates logic control of each part and responds to button power query and display, and realizes LED lighting and strobe control.

Further, the button identification is composed of R26 and U1's P20 pin, the four-segment power display is composed of LED25, LED50, LED75, LED100, R25, U1's P17, P18, and P19 pins, and the lighting and flashing functions of the LED lamp are composed of D7, R43, Q4 and P15 pin of U1 are implemented.

Further, the input voltage is divided by R27 and R29, filtered by R28 and C16 and connected to the P1 pin of U1 for detection; the output current is sampled by R32, filtered by R9 and C7, and connected to the P12 pin of U1 for detection; the battery is detected by R21, R22 divides the pressure, after filtering by R23 and C14, it is connected to the P11 pin of U1 for detection.

The above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present application and the new description content are all Still belong to the scope that this new patent covers.

Claims (10)

1. A mobile power supply with a car starting function, characterized in that: it includes a power input module, a charging circuit, a cell protection circuit, a battery cell, a DC-DC step-down circuit, and an MCU controller; the power input module and the One end of the MCU controller is electrically connected, the other end of the MCU controller is electrically connected to the charging circuit and the DC-DC step-down circuit, the charging circuit is electrically connected to the battery protection circuit, and the electrical The cell protection circuit is electrically connected to the cell; the power input module provides energy for charging, and the charging circuit charges the cell with constant voltage and constant current through the cell protection circuit, and the cell protection circuit The circuit implements overcharge, overdischarge, short circuit and overcurrent protection for the battery core, the battery core is used for energy storage, and the DC-DC step-down circuit is controlled by the MCU controller. 2. A mobile power supply with a car starting function according to claim 1, further comprising a 12V output circuit electrically connected to the battery cell, and a 12V output interface electrically connected to the 12V output circuit. 3. A mobile power supply with a car starting function according to claim 1, characterized in that: it also includes a 5V step-down circuit electrically connected to the DC-DC step-down circuit, and an electrical connection with the 5V step-down circuit. Connect the 5V output interface. 4. A mobile power supply with a car starting function according to claim 3, wherein the 5V output interface is a USB interface. 5. A mobile power supply with a car starting function according to claim 1, characterized in that: the power input module and the charging circuit are composed of D5, MOS transistor Q3, single-chip microcomputer U1, inductor L2, freewheeling diode D6 , filter capacitor C16, and R5, the single-chip microcomputer U1 detects the charging current through R5, and outputs a PWM signal through pin 14 to drive Q3 to work in the switch state, and the cooperation of the energy storage inductor L2 and the freewheeling diode D6 realizes the constant voltage of the battery cell Constant current charging, at the same time, the MCU controller is connected to pin 11 of the single-chip microcomputer U1 through R21, R22, and R23 to query the current charging status of the battery cell. 6. A mobile power supply with a car starting function according to claim 1, characterized in that: the cell protection circuit is composed of U2 and two dual MOS transistors U5, U2 monitors the voltage of the cell and the current flowing through it To control U5 to realize overcharge, overdischarge, short circuit and overcurrent protection. 7. A mobile power supply with a car starting function according to claim 5, characterized in that: said DC-DC step-down circuit is composed of chip U3, inductor L1, filter capacitor C8, output voltage sampling feedback resistors R40, R35 Composed with U1, U3 and inductor L2 realize synchronous rectification and step-down function, C8 filters output clutter and stabilizes the output voltage; single-chip U1 detects the status of the discharge output through R40 and R35. 8. A mobile power supply with car start function according to claim 1, characterized in that: said MCU controller is composed of single-chip microcomputer U1, button S1, four-segment power display LED25-LED100, lighting flashlight D7, single-chip microcomputer U1 It is the core main control IC, which realizes key recognition, four-segment battery indicator drive control, D7 lighting or strobe control, input voltage detection, output current detection, battery voltage detection, and logical coordination control of the overall scheme. 9. A mobile power supply with car start function according to claim 8, characterized in that: the key identification is composed of R26 and U1 pin P20, and the four-segment power display is composed of LED25, LED50, LED75, LED100 , R25, P17, P18, and P19 pins of U1, and the lighting and flashing functions of the LED lamp are realized by D7, R43, Q4, and P15 pins of U1. 10. A mobile power supply with a car starting function according to claim 8, characterized in that: the input voltage is divided by R27 and R29, filtered by R28 and C16 and connected to the P1 pin of U1 for detection; the output current is determined by R32 sampled, filtered by R9 and C7, connected to P12 pin of U1 for detection; the cell was divided by R21 and R22, filtered by R23 and C14, and connected to P11 pin of U1 for detection.