QC fast-charging mobile phone charger

Abstract

The utility model discloses a QC fast-charging mobile phone charger, and relates to the technical field of chargers. Comprising a face shell, a PCB, a bottom shell, a contact elastic piece and a pin, the face shell and the bottom shell are combined to form an integral shell, the PCB is arranged in the integral shell, and the contact elastic piece on the PCB is connected with the pin outside the bottom shell. The high-temperature-resistant cable is reasonable in structural design, low in product temperature rise, capable of working normally in the environment of + 50-30 DEG C, good in fast charging effect, good in fireproof performance and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of charger technology, specifically to a QC fast charging mobile phone charger. Background Technology

[0002] There are many types of mobile phone chargers on the market, but they all have a common drawback: if the temperature is too high or too low, it will affect the charging efficiency, cannot guarantee the charging efficiency, the charging speed is slow, and they are inconvenient to carry.

[0003] In summary, this utility model designs a QC fast charging mobile phone charger with USB that supports fast charging function for mobile phones. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a QC fast charging mobile phone charger with a reasonable structural design, low product temperature rise, normal operation in environments ranging from +50℃ to 30℃, good fast charging effect, excellent fire resistance, and strong practicality.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a QC fast charging mobile phone charger, including a front shell, a PCB board, a bottom shell, contact springs and pins, the front shell and the bottom shell are combined into an integral shell, the PCB board is arranged inside the integral shell, and the contact springs on the PCB board are connected to the pins on the outside of the bottom shell.

[0006] Preferably, the pins are connected to a common-mode inductor via a fuse. Pins 3 and 4 of the common-mode inductor are connected to the two ends of a filter capacitor, respectively. Pin 3 of the common-mode inductor is also connected to the positive terminal of the first diode and pin 1 of the rectifier bridge. Pin 3 of the rectifier bridge is connected to the positive terminal of the second diode. The negative terminals of the second and first diodes are connected to pin 5 of the PWM chip via a seventh resistor and a first resistor, respectively. Pins 2 and 4 of the rectifier bridge are connected to the positive and negative terminals of the first capacitor, respectively. One end of the first inductor connected in parallel with a resistor is connected to the positive terminal of the first capacitor, and the other end is connected to the positive terminals of the third and second capacitors. The negative terminal of the first capacitor is grounded via a fourth inductor. The negative terminals of the second and third capacitors are both grounded. One end of the seventeenth, fifteenth, and eleventh resistors connected in parallel is connected to the positive terminal of the second capacitor, and the other end is connected to the negative terminal of the fifth diode via a sixteenth resistor. The positive terminal of the fifth diode is connected to one end of the twenty-first capacitor and pin 2 of the transformer. The other end of the twenty-first capacitor is connected to pin 1 of the transformer. Pin 8 of the transformer is connected to one end of the thirteenth capacitor, pins 3 and 4 of the synchronous rectifier chip U3, and one end of the twentieth resistor. The other end of the twentieth resistor is connected to pins 5, 6, 7, and 8 of the PWM chip and the positive terminal of the seventeenth capacitor through the twelfth capacitor. The seventeenth capacitor and the fifth capacitor are connected in parallel. The positive terminal of the fifth capacitor is also connected to the twenty-second resistor, the seventeenth resistor, and pin 1 of the protocol chip. Pin 7 of the PWM chip is connected to the positive terminal of the fifth diode and one end of the twenty-third capacitor. The other end of the twenty-third capacitor is connected to pin 6 of the PWM chip. Pin 4 of the PWM chip is connected to the emitter of the switching transistor. The collector of the switching transistor is connected to pin 1 of the PWM chip through the sixth resistor, the third diode, and the second resistor.

[0007] Preferably, the protocol chip (U4) is a PD QC fast charging protocol chip for the power supply, and the chip model of the power supply is SC3012C.

[0008] Preferably, the protocol chip is also connected to the USB1 interface.

[0009] The beneficial effects of this utility model are:

[0010] This utility model is a QC fast charging charger that supports fast charging for mobile phones and includes a USB port. The product has low temperature rise and can still operate normally in environments ranging from +50°C to -30°C. It features 3A overcurrent protection, over-temperature protection, output short-circuit protection, and insulation safety protection. The operating temperature range is -30°C to 50°C, and the humidity range is 0% to 90%. It uses fire-retardant materials and supports MTK PR2.0, PE3.0, QC2.0, and QC3.0 fast charging protocols. Attached Figure Description

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

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

[0013] Figure 2 This is the circuit diagram of this utility model;

[0014] Figure 3 This is a schematic diagram of the USB interface of this utility model. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] Reference Figure 1 The specific embodiment adopts the following technical solution: A QC fast charging mobile phone charger includes a front shell 1, a PCB board 2, a bottom shell 3, contact springs 4 and pins 5. The front shell 1 and the bottom shell 3 are combined into an overall shell. The PCB board 2 is arranged inside the overall shell. The contact springs 4 on the PCB board 2 are connected to the pins 5 on the outside of the bottom shell 3.

[0017] It is worth noting that pin 5 is connected to common-mode inductor LF1 via fuse F1. Pins 3 and 4 of common-mode inductor LF1 are connected to the two ends of filter capacitor CX1, respectively. Pin 3 of common-mode inductor LF1 is also connected to the positive terminal of the first diode D1 and pin 1 of rectifier bridge BD1. Pin 3 of rectifier bridge BD1 is connected to the positive terminal of the second diode D2. The negative terminals of the second diode D2 and the first diode D1 are both connected to pin 5 of PWM chip U2 via resistor R7 and resistor R1, respectively. Pin 2 of rectifier bridge BD1... Pins 1 and 4 are connected to the positive and negative terminals of the first capacitor C1, respectively. One end of the first inductor L1 connected in parallel with a resistor is connected to the positive terminal of the first capacitor C1, and the other end is connected to the positive terminals of the third capacitor C3 and the second capacitor C2. The negative terminal of the first capacitor is grounded through the fourth inductor L4, and the negative terminals of the second capacitor C2 and the third capacitor C3 are both grounded. One end of the seventeenth resistor R17, the fifteenth resistor R15, and the eleventh capacitor C11 connected in parallel is connected to the positive terminal of the second capacitor C2, and the other end is connected to the negative terminal of the fifth diode D5 through the sixteenth resistor R16. The positive terminal of the fifth diode D5 is connected to one end of the twenty-first capacitor C21 and pin 2 of the transformer T1A. The other end of the twenty-first capacitor C21 is connected to pin 1 of the transformer T1A. Pin 8 of the transformer T1A is connected to one end of the thirteenth capacitor C13, pins 3 and 4 of the synchronous rectifier chip U3, and one end of the twentieth resistor R20. The other end of the twentieth resistor R20 is connected through the twelfth capacitor C12 to pins 5, 6, 7, and 8 of the PWM chip U2 and the positive terminal of the seventeenth capacitor C17. The seventeenth capacitor C17 and the fifth capacitor... C5 is connected in parallel. The positive terminal of the fifth capacitor C5 is also connected to the twenty-second resistor R22, the seventeenth resistor R17, and pin 1 of the protocol chip U4. Pin 7 of the PWM chip U2 is connected to the positive terminal of the fifth diode D5 and one end of the twenty-third capacitor C23. The other end of the twenty-third capacitor C23 is connected to pin 6 of the PWM chip U2. Pin 4 of the PWM chip U2 is connected to the emitter of the switching transistor Q1. The collector of the switching transistor Q1 is connected to pin 1 of the PWM chip U2 through the sixth resistor R6, the third diode D3, and the second resistor R2.

[0018] It is worth noting that the PWM chip U2 is model number SC3012C.

[0019] In addition, the protocol chip U4 is also connected to the USB1 interface.

[0020] The working principle of this specific implementation is as follows: First, AC voltage is input from both ends of the connector, passing through fuse F1. The fuse's function is to prevent damage to downstream components by tripping the circuit. Then, it passes through common-mode inductor LF1 for EMC anti-interference circuitry to suppress common-mode interference. Next, it passes through rectifier bridge BD1 for bridge rectification to convert AC to DC. This DC voltage is then filtered by second capacitor C2, first inductor L1, etc., and applied to the primary winding of transformer T1A and the drain of switching transistor Q1. When the voltage of the transformer VCC winding reaches the IC's operating voltage, PWM IC U2 (model SC3012C) controls the switching on and off of transistor Q1, thereby inducing an alternating voltage from the transformer secondary winding. This voltage is then synchronously rectified by synchronous rectifier chip U3 and filtered by capacitors to become DC voltage, which is then sent to protocol chip U4. Protocol chip U4 is the PD QC fast charging protocol chip for the power supply. The charging speed of the DC voltage and the corresponding protocol are controlled and detected by U4.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A QC fast charging mobile phone charger, characterized in that, The device includes a front shell (1), a PCB board (2), a bottom shell (3), contact springs (4), and pins (5). The front shell (1) and the bottom shell (3) are combined into an overall shell. The PCB board (2) is installed inside the overall shell. The contact springs (4) on the PCB board (2) are connected to the pins (5) on the outside of the bottom shell (3). The pins (5) are connected to a common-mode inductor (LF1) through a fuse (F1). Pins 3 and 4 of the common-mode inductor (LF1) are connected to the two ends of a filter capacitor (CX1), respectively. Pin 3 of the common-mode inductor (LF1) is also connected to the positive terminal of the first diode (D1) and pin 1 of the rectifier bridge (BD1). Pin 3 of the rectifier bridge (BD1) is connected to the positive terminal of the second diode (D2). The negative terminals of diode (D2) and the first diode (D1) are connected to pin 5 of the PWM chip (U2) via resistors 7 (R7) and 1 (R1) in sequence. The PWM chip (U2) is model OB2736V. Pins 2 and 4 of the rectifier bridge (BD1) are connected to the positive and negative terminals of the first capacitor (C1) respectively. One end of the first inductor (L1) connected in parallel with a resistor is connected to the positive terminal of the first capacitor (C1), and the other end is connected to the positive terminals of the third capacitor (C3) and the second capacitor (C2). The negative terminal of the first capacitor is grounded through the fourth inductor (L4). The negative terminals of the second capacitor (C2) and the third capacitor (C3) are both grounded. Resistors 17 (R17) and 15 (R15) are also connected. One end of the eleventh capacitor (C11) is connected in parallel to the positive terminal of the second capacitor (C2), and the other end is connected to the negative terminal of the fifth diode (D5) through the sixteenth resistor (R16). The positive terminal of the fifth diode (D5) is connected to one end of the twenty-first capacitor (C21) and pin 2 of the transformer (T1A). The other end of the twenty-first capacitor (C21) is connected to pin 1 of the transformer (T1A). Pin 8 of the transformer (T1A) is connected to one end of the thirteenth capacitor (C13), pins 3 and 4 of the synchronous rectifier chip (U3), and one end of the twentieth resistor (R20). The other end of the twentieth resistor (R20) is connected to pins 5, 6, 7, and 8 of the PWM chip (U2) and the seventeenth capacitor (C12). The positive terminal of capacitor (C17) is connected. The seventeenth capacitor (C17) and the fifth capacitor (C5) are connected in parallel. The positive terminal of the fifth capacitor (C5) is also connected to the twenty-second resistor (R22), the seventeenth resistor (R17), and pin 1 of the protocol chip (U4). Pin 7 of the PWM chip (U2) is connected to the positive terminal of the fifth diode (D5) and one end of the twenty-third capacitor (C23). The other end of the twenty-third capacitor (C23) is connected to pin 6 of the PWM chip (U2). Pin 4 of the PWM chip (U2) is connected to the emitter of the switching transistor (Q1). The collector of the switching transistor (Q1) is connected to pin 1 of the PWM chip (U2) through the sixth resistor (R6), the third diode (D3), and the second resistor (R2).

2. A QC fast charging mobile phone charger according to claim 1, characterized in that, The aforementioned protocol chip (U4) is the PD QC fast charging protocol chip for the power supply, and the chip model of the power supply is SC3012C.

3. A QC fast charging mobile phone charger according to claim 1, characterized in that, The protocol chip (U4) is also connected to the USB1 interface.

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