Fast charging circuit

Abstract

The utility model discloses a fast charging circuit which comprises a rectifier module, a filter module, a power management module, a transformer, a power conversion module, a fast charging protocol chip and an output end, the rectifier module is connected with an external power supply, and the rectifier module, the filter module and the power management module are arranged at the primary side of the transformer. The power conversion module, the fast charging protocol chip and the output end are arranged at the secondary side of the transformer, the filter module is connected with the rectifier module, the power management module is connected with the filter module, the power conversion module is connected with the transformer, the fast charging protocol chip is connected with the power conversion module, and the output end is connected with the fast charging protocol chip. The circuit has stability, prevents voltage from being too high, and improves safety.

Description

Technical Field

[0001] This utility model relates to a charging circuit, specifically a fast charging circuit suitable for mobile terminals such as mobile phones. Background Technology

[0002] With the advancement of technology, electronic devices are increasingly widely used in people's work and life. While providing fast and convenient services, people's dependence on electronic devices is also increasing, and work and life have become inseparable from them. Because the normal operation of electronic devices requires batteries, but with the accelerating pace of work and life, there is not much time to wait for the long charging process of electronic device batteries. Therefore, improving charging efficiency has become a constantly evolving issue.

[0003] In existing technologies, improving charging efficiency is mainly achieved by increasing the output voltage of the adapter to increase the charging current, thereby improving charging efficiency. As the charging current increases, the charging current through the fast charging circuit and the protection circuit used to protect the battery cells also increases. With the increase in charging current, the heat generated by the fast charging circuit and the protection circuit increases by the square of the charging current. If overcurrent cannot be detected and prevented in time, damage may easily occur. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a fast charging circuit.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A fast charging circuit includes a rectifier module, a filter module, a power management module, a transformer, a power conversion module, a fast charging protocol chip, and an output terminal. The rectifier module is connected to an external power supply. The rectifier module, filter module, and power management module are located on the primary side of the transformer. The power conversion module, fast charging protocol chip, and output terminal are located on the secondary side of the transformer. The filter module is connected to the rectifier module, the power management module is connected to the filter module, the power conversion module is connected to the transformer, the fast charging protocol chip is connected to the power conversion module, and the output terminal is connected to the fast charging protocol chip.

[0007] As a further improvement, the power management module has pins GATE, CS, GND, VCC, DEM, and FB. Pin GATE is connected to diode D3 via resistor R10. Diode D3 is connected to the drain of MOSFET Q1 via capacitor C2. Pin CS is connected to the source of MOSFET Q1 via resistor R13. The gate of MOSFET Q1 is connected to the emitter of transistor Q3 via inductor L3. The base of transistor Q3 is connected to diode D3 and resistor R10. The collector of transistor Q3 is connected to resistor R13 via resistor R11. Resistor R11 is also connected to resistor R12. Resistor R12 is connected to the gate of MOSFET. Pin VCC is connected to the filter module via resistor R9. Pin DEM is connected to the primary winding of transformer via resistor R7.

[0008] As a further improvement, the power management module has an optocoupler U2B connected to pin FB. Optocoupler U2B is connected to pin GND and resistor R13. The source of MOSFET Q1 is connected to optocoupler U2B through resistor R14. The reference DEM is connected to resistor R8, which is connected to optocoupler U2B. Resistor R7 is connected to diode D4, which is connected to resistor R15 through NTC1. Resistor R15 is connected to pin CS. Resistor R13 is connected to capacitor C7, which is connected to the primary winding of the transformer.

[0009] As a further improvement, the power conversion module is a B560 motherboard, with the input terminal of the B560 motherboard connected to the secondary winding of the transformer and the output terminal of the B560 motherboard connected to the fast charging protocol chip.

[0010] As a further improvement, the fast charging protocol chip is the IP2736U QFN24 model.

[0011] As a further improvement, the fast charging protocol chip is connected to an optocoupler U2A and a MOSFET Q5. The gate of the MOSFET Q5 is directly connected to the fast charging protocol chip, the drain of the MOSFET Q5 is connected to the optocoupler U2A, the source of the MOSFET Q5 is connected to the fast charging protocol chip through a resistor R23, and the source of the MOSFET Q5 is connected to the output terminal.

[0012] As a further improvement, the fast charging protocol chip and output terminal are integrated on the B602 small board.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] The controller can adjust the output voltage to prevent damage caused by excessive voltage, thus providing effective protection and improving safety while meeting fast charging requirements. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circuit principle of this utility model;

[0016] Figure 2 This is a schematic diagram of the circuit principle of the primary side of the transformer in this utility model;

[0017] Figure 3 This is a schematic diagram of the circuit principle of the secondary side of the transformer in this utility model. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0021] like Figure 1-3As shown, a fast charging circuit includes a rectifier module, a filter module, a power management module, a transformer, a power conversion module, a fast charging protocol chip, and an output terminal. The rectifier module is connected to an external power supply. The rectifier module, filter module, and power management module are located on the primary side of the transformer. The power conversion module, fast charging protocol chip, and output terminal are located on the secondary side of the transformer. The filter module is connected to the rectifier module, the power management module is connected to the filter module, the power conversion module is connected to the transformer, the fast charging protocol chip is connected to the power conversion module, and the output terminal is connected to the fast charging protocol chip. The rectifier module and filter module are existing common modules that perform rectification and filtering functions.

[0022] The power management module has pins GATE, CS, GND, VCC, DEM, and FB. Pin GATE is connected to diode D3 via resistor R10. Diode D3 is connected to the drain of MOSFET Q1 via capacitor C2. Pin CS is connected to the source of MOSFET Q1 via resistor R13. The gate of MOSFET Q1 is connected to the emitter of transistor Q3 via inductor L3. The base of transistor Q3 is connected to diode D3 and resistor R10. The collector of transistor Q3 is connected to resistor R13 via resistor R11. Resistor R11 is also connected to resistor R12. Resistor R12 is connected to the gate of the MOSFET. Pin VCC is connected to the filter module via resistor R9. Pin DEM is connected to the primary winding of the transformer via resistor R7. The power management module controls the output voltage to prevent excessive output voltage.

[0023] The power management module has an optocoupler U2B connected to pin FB. Optocoupler U2B is connected to pin GND and resistor R13. The source of MOSFET Q1 is connected to optocoupler U2B through resistor R14. The reference DEM is connected to resistor R8, which is connected to optocoupler U2B. Resistor R7 is connected to diode D4, which is connected to resistor R15 through NTC1. Resistor R15 is connected to pin CS. Resistor R13 is connected to capacitor C7, which is connected to the primary winding of the transformer.

[0024] In addition, the filter module is connected to resistors R4 and R5, which act as voltage dividers. Resistor R5 is also connected in series with resistor R6, and resistor R6 is connected to diode D1.

[0025] The power conversion module is a B560 motherboard. The input terminal of the B560 motherboard is connected to the secondary winding of the transformer, and the output terminal of the B560 motherboard is connected to the fast charging protocol chip. The B560 motherboard is equipped with a power conversion chip U3 and a switching transistor Q4 to facilitate power conversion control. The switching transistor Q4 is used to realize on / off control.

[0026] The fast charging protocol chip is model IP2736U QFN24.

[0027] The fast charging protocol chip U4 is connected to an optocoupler U2A and a MOSFET Q5. The gate of MOSFET Q5 is directly connected to the fast charging protocol chip, the drain of MOSFET Q5 is connected to the optocoupler U2A, and the source of MOSFET Q5 is connected to the fast charging protocol chip through a resistor R23. The source of MOSFET Q5 is also connected to the output terminal. The fast charging protocol chip and the output terminal are integrated on a B602 small board.

[0028] The fast charging protocol chip has pins FB, NTC, GND, CMPI, CMPV, VCC, VIN, VOUTIG, VOUT, DM, DP, CC2, CC1, CSP, and CSN. Pin FB is connected to optocoupler U2A via resistor R18; pin CMPI is connected to resistor R18 via capacitor C15; pin CMPV is connected to resistor R18 via resistor R21 and capacitor C14; capacitor C10 is connected in parallel across resistor R18; pin NTC is connected to NTC2; and pin CC1 is connected to... Resistor R25 is connected to the output terminal. Pin CC2 is connected to the output terminal via resistor R26 and capacitor C17. Resistor R25 is connected to capacitor C16. Pin DP is connected to the output terminal via resistor R27, with capacitor C18 connected in parallel with resistor R27. Pin DM is connected to the output terminal via resistor R28. The source of MOSFET Q5 is connected to Zener diodes Z5 and Z4 via capacitor C13. Zener diode Z5 is connected to resistor R28 and the output terminal. Zener diode Z4 is connected to resistor R27 and the output terminal. Zener diode Z2 is connected to resistor R25, and Zener diode Z3 is connected to resistor R26. Pin VOUT is connected to the source of the MOSFET via resistor R23. Pin VOUTIG is connected to the gate of the MOSFET. Resistor R22 is connected in parallel between the gate and source of the MOSFET. Resistor R20 is connected to the drain of the MOSFET and is also connected to pin VIN.

[0029] It should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fast charging circuit, characterized in that, It includes a rectifier module, a filter module, a power management module, a transformer, a power conversion module, a fast charging protocol chip, and an output terminal. The rectifier module is connected to an external power supply. The rectifier module, filter module, and power management module are located on the primary side of the transformer. The power conversion module, fast charging protocol chip, and output terminal are located on the secondary side of the transformer. The filter module is connected to the rectifier module, the power management module is connected to the filter module, the power conversion module is connected to the transformer, the fast charging protocol chip is connected to the power conversion module, and the output terminal is connected to the fast charging protocol chip.

2. The fast charging circuit according to claim 1, characterized in that, The power management module has pins GATE, CS, GND, VCC, DEM, and FB. Pin GATE is connected to diode D3 via resistor R10. Diode D3 is connected to the drain of MOSFET Q1 via capacitor C2. Pin CS is connected to the source of MOSFET Q1 via resistor R13. The gate of MOSFET Q1 is connected to the emitter of transistor Q3 via inductor L3. The base of transistor Q3 is connected to diode D3 and resistor R10. The collector of transistor Q3 is connected to resistor R13 via resistor R11. Resistor R11 is also connected to resistor R12. Resistor R12 is connected to the gate of MOSFET. Pin VCC is connected to the filter module via resistor R9. Pin DEM is connected to the primary winding of transformer via resistor R7.

3. The fast charging circuit according to claim 2, characterized in that, The power management module has an optocoupler U2B connected to pin FB. Optocoupler U2B is connected to pin GND and resistor R13. The source of MOSFET Q1 is connected to optocoupler U2B through resistor R14. The reference DEM is connected to resistor R8, which is connected to optocoupler U2B. Resistor R7 is connected to diode D4, which is connected to resistor R15 through NTC1. Resistor R15 is connected to pin CS. Resistor R13 is connected to capacitor C7, which is connected to the primary winding of the transformer.

4. The fast charging circuit according to claim 3, characterized in that, The power conversion module is a B560 motherboard. The input terminal of the B560 motherboard is connected to the secondary winding of the transformer, and the output terminal of the B560 motherboard is connected to the fast charging protocol chip.

5. The fast charging circuit according to claim 4, characterized in that, The fast charging protocol chip is model IP2736UQFN24.

6. The fast charging circuit according to claim 5, characterized in that, The fast charging protocol chip is connected to an optocoupler U2A and a MOSFET Q5. The gate of the MOSFET Q5 is directly connected to the fast charging protocol chip, the drain of the MOSFET Q5 is connected to the optocoupler U2A, the source of the MOSFET Q5 is connected to the fast charging protocol chip through a resistor R23, and the source of the MOSFET Q5 is connected to the output terminal.

7. The fast charging circuit according to claim 6, characterized in that, The fast charging protocol chip and output terminal are integrated on the B602 small board.

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