Vehicle-mounted protocol fast charging circuit with buck-boost function

Abstract

The utility model discloses a vehicle-mounted protocol fast charging circuit with a buck-boost function, which comprises an input protection circuit S101, an input end current detection circuit S102, a synchronous buck-boost circuit S103, an output end current detection circuit S104, a control chip circuit S105, a C port output circuit S106 and an A port output circuit S107. When the protocol voltage is lower than 12V, the controller U3 controls the synchronous buck-boost circuit to boost, when the protocol voltage is lower than 12V, the controller U3 controls the synchronous buck-boost circuit to reduce the voltage, the controller U3 detects the input end current detection circuit, the current at the time is judged to be overcurrent through the voltage at the two ends of the resistor R2, and the controller U3 detects the output end current. And the overcurrent of the output current is judged through the voltage at the two ends of the resistor R3.

Description

Technical Field

[0001] This utility model relates to the field of vehicle fast charging protocol technology, specifically a vehicle fast charging protocol circuit with boost / buck voltage function. Background Technology

[0002] Current automotive fast charging circuits generally use a buck converter. This buck converter is limited by the vehicle's low-voltage power supply, with a maximum output voltage not exceeding 12V. It cannot provide higher fast charging voltages or more efficient fast charging protocols for devices, preventing it from operating at its full protocol capacity. This makes users feel that in-vehicle fast charging is slower than the original charger. Furthermore, most in-vehicle fast chargers only offer USB-C (C) fast charging and lack USB-A (A) fast charging capabilities.

[0003] To address this, a vehicle-mounted protocol fast charging circuit with boost / buck voltage function is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide an on-board fast charging circuit with boost / buck voltage function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A vehicle-mounted protocol fast charging circuit with buck-boost function includes an input protection circuit S101, an input current detection circuit S102, a synchronous buck-boost circuit S103, an output current detection circuit S104, a control chip circuit S105, a USB-C output circuit S106, and a USB-A output circuit S107. The input protection circuit S101 is connected to the input current detection circuit S102, the input current detection circuit S102 is connected to the synchronous buck-boost circuit S103, the synchronous buck-boost circuit S103 is connected to the output current detection circuit S104, and the output current detection circuit S104 is connected to the control chip circuit S105 and the USB-C output circuit S106.

[0007] The control chip circuit S105 is equipped with a control chip U3, model IP6557;

[0008] The control chip circuit S105 is connected to the A port output circuit S107, and the C port output circuit S106 is connected to the control chip circuit S105.

[0009] The input current detection circuit S102 is connected to the control chip circuit S105, and the synchronous buck-boost circuit S103 is connected to the control chip circuit S105.

[0010] Furthermore, the input protection circuit S101 includes a power input socket U1, a Schottky diode D3, a resettable fuse F1, transient diodes (D1, D2), and input filter capacitors (C2, C3);

[0011] Pins 3 and 4 of the U1 power socket are connected to pins 1 and 2 of the Schottky diode D3 and are also connected to the positive terminal of the vehicle's 12V power supply. Pins 1 and 2 of the U1 power socket are connected to ground and are also connected to the negative terminal of the vehicle's 12V power supply. Pin 3 of the Schottky diode D3 is connected to pin 1 of the resettable fuse F1. Pin 2 of the resettable fuse F1 is connected to transient diodes D1 and D2, input filter capacitor C2, input filter capacitor C3, resistor R2, pin 1 of capacitor C1, and pins 22 and 23 of the control chip U3.

[0012] Furthermore, the input current detection circuit S102 includes a capacitor C1, a resistor R1, and a resistor R2;

[0013] The first pin of capacitor C1 and resistor R2 is connected to the second pin of resettable fuse F1, transient diodes D1 and D2, input filter capacitor C2, and the first pin of input filter capacitor C3. The second pin of resistor R2 is connected to the first pin of resistor R1, the first pin of transistor Q1, and the second pin of control chip U3. The second pin of resistor R1 is connected to the second pin of capacitor C1 and the second pin of control chip U3.

[0014] Furthermore, the synchronous buck-boost circuit S103 includes transistors (Q1, Q2), resistors R4 and R8, capacitors C4, R9, C9, C5, R10, C10, R6, R11, and power inductor U2.

[0015] Pin 1 of transistor Q1 and pin 2 of resistor R2 are connected to pin 19 of control chip U3. Pin 2 of transistor Q1 is connected to pin 4 of resistor R4. Pin 3 of transistor Q1 is connected to pin 17 of control chip U3, pin 2 of capacitor C4, pin 1 of resistor R9, and pin 1 of power input socket U1. Pin 4 of capacitor C4 is connected to pin 2 of resistor R8. Pin 1 of resistor R8 is connected to pin 16 of control chip U3. Transistor Q2 is connected to pin 11 of control chip U3, and pins 1 of resistors R3 and R5. Pin 2 of transistor Q2 is connected to pin 1 of resistor R6. Pin 2 of resistor R6 is connected to pin 12 of control chip U3. Pin 3 of transistor Q2 is connected to pin 11 of control chip U3, pin 2 of capacitor C5, pin 2 of power inductor U2, and pin 1 of resistor R10. Pin 1 of capacitor C5 is connected to pin 13 of control chip U3. Pin 2 of resistor R10 is connected to pin 1 of capacitor C1. Pin 4 of transistor Q2 is connected to pin 1 of resistor R11. Pin 2 of resistor R11 is connected to pin 15 of control chip U3.

[0016] Furthermore, the output current detection current S104 includes resistor R5, resistor R3, and capacitor C8;

[0017] Pin 1 of resistor R5 is connected to pin 1 of resistor R3, pin 11 of control chip U3, and pin 1 of transistor Q2. Pin 2 of resistor R5 is connected to pin 10 of control chip U3 and pin 1 of capacitor C8. Pin 2 of resistor R3 is connected to pin 2 of capacitor C8, pin 9 of control chip U3, capacitors C6 and C7, MOSFET Q3, capacitors C11 and C12, pin 1 of MOSFET Q4, and pins 2, 5, and 8 of control chip U3.

[0018] Furthermore, the C-port output circuit S106 includes capacitor C6, capacitor C7, MOSFET Q3, resistor R7, and USB1-USB interface;

[0019] Pins 2 and 11 of USB2 are connected to pins 3, 4, and 5 of MOSFET Q3 and pin 7 of control chip U3. Pin 2 of MOSFET Q3 is connected to pin 2 of resistor R7. Pin 1 of resistor R7 is connected to pin 6 of control chip U3. Pin 4 of USB1 is connected to pin 40 of control chip U3. Pins 5 and 7 of USB1 are connected to pin 39 of control chip U3. Pins 6 and 8 of USB1 are connected to pin 38 of control chip U3. Pin 10 of USB1 is connected to pin 37 of control chip U3.

[0020] Furthermore, the A-port output circuit S107 includes capacitor C11, capacitor C12, MOSFET Q4, resistor R12, and USB2-USB interface;

[0021] Pin 1 of USB2 is connected to pins 3, 4, and 5 of MOSFET Q4 and pin 4 of control chip U3. Pin 2 of MOSFET Q4 is connected to pin 2 of resistor R12. Pin 1 of resistor R12 is connected to pin 3 of control chip U3. Pin 2 of USB2 is connected to pin 36 of control chip U3. Pin 3 of USB2 is connected to pin 35 of control chip U3.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] Through the synchronous buck-boost circuit, when the protocol voltage exceeds 12V, the controller U3 controls the synchronous buck-boost circuit to boost the voltage, and when the protocol voltage is lower than 12V, the controller U3 controls the synchronous buck-boost circuit to buck the voltage. The controller U3 detects the input current detection circuit and determines whether the input current is overcurrent by measuring the voltage across resistor R2. The controller U3 detects the output current detection circuit and determines whether the output current is overcurrent by measuring the voltage across resistor R3. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the circuit structure of this utility model. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Example 1:

[0027] Please see Figure 1 This utility model provides a technical solution:

[0028] A vehicle-mounted protocol fast charging circuit with buck-boost function includes an input protection circuit S101, an input current detection circuit S102, a synchronous buck-boost circuit S103, an output current detection circuit S104, a control chip circuit S105, a USB-C output circuit S106, and a USB-A output circuit S107. The input protection circuit S101 is connected to the input current detection circuit S102. The input current detection circuit S102 is connected to the synchronous buck-boost circuit S103. The synchronous buck-boost circuit S103 is connected to the output current detection circuit S104. The output current detection circuit S104 is connected to the control chip circuit S105 and the USB-C output circuit S106. The control chip circuit S105 is connected to the USB-A output circuit S107. The USB-C output circuit S106 is connected to the control chip circuit S105. The input current detection circuit S102 is connected to the control chip circuit S105. The synchronous buck-boost circuit S103 is connected to the control chip circuit S105.

[0029] The input protection circuit S101 includes a power input socket U1 (model K828801WR-2x02-PTSN), a Schottky diode D3 (model SL1545), a resettable fuse F1 (2920L1000SL21GRG), transient diodes (D1, D2) (model SMCJ18CA), and input filter capacitors (C2, C3). Pins 3 and 4 of the power socket U1 are connected to pins 1 and 2 of the Schottky diode D3, which are also connected to the positive terminal of the vehicle's 12V power supply. Pins 1 and 2 of the power socket U1 are connected to ground, which is also connected to the negative terminal of the vehicle's 12V power supply. Pin 3 of the Schottky diode D3 is connected to pin 1 of the resettable fuse F1. Pin 2 of the resettable fuse F1 is connected to transient diodes D1 and D2, input filter capacitors C2 and C3, resistor R2, pin 1 of capacitor C1, and pins 22 and 23 of the control chip U3.

[0030] The input current detection circuit S102 includes capacitor C1, resistor R1, and resistor R2 (model FRM121WFR005TM). Pin 1 of capacitor C1 and resistor R2 is connected to pin 2 of resettable fuse F1, transient diode D1, transient diode D2, input filter capacitor C2, and pin 1 of input filter capacitor C3. Pin 2 of resistor R2 is connected to pin 1 of resistor R1, pin 1 of transistor Q1, and pin 20 of control chip U3. Pin 2 of resistor R1 is connected to pin 2 of capacitor C1 and pin 21 of control chip U3.

[0031] The synchronous buck-boost circuit S103 includes transistors (Q1, Q2, half-bridge chip model SIZ340DT-T1-GE3), resistors R4 and R8, capacitors C4, R9, C9, C5, R10, C10, R6, R11, and a power inductor U2 (model PDMTAT068125). Pin 1 of transistor Q1 and pin 2 of resistor R2 are connected to pin 19 of control chip U3. Pin 2 of transistor Q1 is connected to pin 3 of resistor R4. Pin 3 of transistor Q1 is connected to pin 17 of control chip U3, pin 2 of capacitor C4, pin 1 of resistor R9, and pin 1 of power input socket U1. Pin 4 of capacitor C4 is connected to pin 1 of resistor R8. Pin 2 of resistor R8 is connected. Pin 1 of resistor R8 is connected to pin 16 of control chip U3. Transistor Q2 is connected to pin 11 of control chip U3, and pins 1 of resistors R3 and R5. Pin 2 of transistor Q2 is connected to pin 1 of the di-group R6. Pin 2 of resistor R6 is connected to pin 12 of control chip U3. Pin 3 of transistor Q2 is connected to pin 11 of control chip U3, pin 2 of capacitor C5, pin 2 of power inductor U2, and pin 1 of resistor R10. Pin 1 of capacitor C5 is connected to pin 13 of control chip U3. Pin 2 of resistor R10 is connected to pin 1 of capacitor C1. Pin 4 of transistor Q2 is connected to pin 1 of resistor R11. Pin 2 of resistor R11 is connected to pin 15 of control chip U3.

[0032] The output current detection current S104 includes resistor R5, resistor R3 (model FRM121WFR005TM), and capacitor C8. Pin 1 of resistor R5 is connected to pin 1 of resistor R3, pin 11 of control chip U3, and pin 1 of transistor Q2. Pin 2 of resistor R5 is connected to pin 10 of control chip U3 and pin 1 of capacitor C8. Pin 2 of resistor R3 is connected to pin 2 of capacitor C8, pin 9 of control chip U3, capacitors C6 and C7, MOSFET Q3, capacitors C11 and C12, pin 1 of MOSFET Q4, and pins 2, 5, and 8 of control chip U3.

[0033] The USB-C output circuit S106 includes capacitors C6 and C7, MOSFET Q3 (model AON7544), resistor R7, and a USB1-USB interface. Pins 2 and 11 of USB2 are connected to pins 3, 4, and 5 of MOSFET Q3 and pin 7 of control chip U3. Pin 2 of MOSFET Q3 is connected to pin 2 of resistor R7. Pin 1 of resistor R7 is connected to pin 6 of control chip U3. Pin 4 of USB1 is connected to pin 40 of control chip U3. Pins 5 and 7 of USB1 are connected to pin 39 of control chip U3. Pins 6 and 8 of USB1 are connected to pin 38 of control chip U3. Pin 10 of USB1 is connected to pin 37 of control chip U3.

[0034] The A-port output circuit S107 includes capacitors C11 and C12, MOSFET Q4 (model AON7544), resistor R12, and a USB2-USB interface. Pin 1 of USB2 is connected to pins 3, 4, and 5 of MOSFET Q4 and pin 4 of control chip U3. Pin 2 of MOSFET Q4 is connected to pin 2 of resistor R12. Pin 1 of resistor R12 is connected to pin 3 of control chip U3. Pin 2 of USB2 is connected to pin 36 of control chip U3. Pin 3 of USB2 is connected to pin 35 of control chip U3.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted protocol fast charging circuit with a boost-buck function, comprising an input protection circuit S101, an input current detection circuit S102, a synchronous boost-buck circuit S103, an output current detection circuit S104, a control chip circuit S105, a C-port output circuit S106, and an A-port output circuit S107, characterized in that: the control chip circuit S105 is provided with a control chip U3, which is of the IP6557 type; the input protection circuit S101 is connected to the input current detection circuit (S102), the input current detection circuit (S102) is connected to the synchronous boost-buck circuit (S103), the synchronous boost-buck circuit (S103) is connected to the output current detection circuit (S104), and the output current detection circuit (S104) is connected to the control chip circuit (S105) and the C-port output circuit (S106); the control chip circuit (S105) is connected to the A-port output circuit (S107), and the C-port output circuit (S106) is connected to the control chip circuit (S105); the input current detection circuit (S102) is connected to the control chip circuit (S105), and the synchronous boost-buck circuit (S103) is connected to the control chip circuit (S105).

2. The vehicle-mounted protocol fast charging circuit with a boost-buck function according to claim 1, characterized in that: The input protection circuit S101 comprises a power input socket U1, a Schottky diode D3, a self-resetting fuse F1, transient diodes (D1 and D2), and input filter capacitors (C2 and C3); the 3 and 4 pins of the U1 power socket are connected to the 1 and 2 pins of the Schottky diode D3 and simultaneously connected to the positive pole of a 12V vehicle power supply, the 1 and 2 pins of the U1 power socket are connected to the ground and simultaneously connected to the negative pole of the 12V vehicle power supply, the 3 pin of the Schottky diode D3 is connected to the 1 pin of the self-resetting fuse F1, and the 2 pin of the self-resetting fuse F1 is connected to the 1 pin of the transient diode D1, the transient diode D2, the input filter capacitor C2, the input filter capacitor C3, the resistor R2, the capacitor C1, the 22 and 23 pins of the control chip U3.

3. The vehicle-mounted protocol fast charging circuit with a boost-buck function according to claim 2, characterized in that: The input current detection circuit (S102) comprises a capacitor C1 and resistors R1 and R2; the 1 pins of the capacitor C1 and the resistors R2 and R2 are connected to the 2 pin of the self-resetting fuse F1, the 1 pins of the transient diodes D1 and D2, the input filter capacitors C2 and C3, the 1 pin of the resistor R2, the 1 pin of the transistor Q1, and the 20 pin of the control chip U3, the 2 pin of the resistor R1 is connected to the 2 pin of the capacitor C1 and the 21 pin of the control chip U3.

4. The vehicle-mounted protocol fast charging circuit with a boost-buck function according to claim 3, characterized in that: The synchronous boost-buck circuit (S103) comprises transistors (Q1 and Q2), resistors R4, R8, and R10, capacitors C4, C9, and C10, and resistors R9 and R11. The pin 1 of the triode Q1, the pin 2 of the resistor R2 and the pin 19 of the control chip U3 are connected, the pin 2 of the triode Q1 and the pin of the resistor R4 are connected, the pin 3 of the triode Q1, the pin 2 of the capacitor C4, the pin 1 of the resistor R9, the pin 1 of the power input socket U1 are connected, the pin 4 of the capacitor C4 and the pin 2 of the resistor R8 are connected, the pin 1 of the resistor R8 and the pin 16 of the control chip U3 are connected, the pin 1 of the triode Q2, the pin 11 of the control chip U3, the resistor R3 and the resistor R5 are connected, the pin 2 of the triode Q2 and the pin 1 of the di press group R6 are connected, the pin 2 of the resistor R6 and the pin 12 of the control chip U3 are connected, the pin 3 of the triode Q2, the pin 11 of the control chip U3, the pin 2 of the capacitor C5, the pin 2 of the power inductance U2 and the pin 1 of the resistor R10 are connected, the pin 1 of the capacitor C5 and the pin 13 of the control chip U3 are connected, the pin 2 of the resistor R10 and the pin 1 of the capacitor C1 are connected, the pin 1 of the triode Q2 and the pin 1 of the resistor R11 are connected, the pin 2 of the resistor R11 and the pin 15 of the control chip U3 are connected.

5. The vehicle-mounted protocol fast charging circuit with a boost-buck function according to claim 4, characterized in that: The output end current detection current (S104) comprises the resistor R5, the resistor R3 and the capacitor C8; The pin 1 of the resistor R5, the pin 1 of the resistor R3, the pin 11 of the control chip U3 and the pin 1 of the triode Q2 are connected, the pin 2 of the resistor R5 and the pin 10 of the control chip U3 and the pin 1 of the capacitor C8 are connected, the pin 2 of the resistor R3, the pin 2 of the capacitor C8, the pin 9 of the control chip U3, the capacitor C6, the capacitor C7, the field effect tube Q3, the capacitor C11, the capacitor C12, the pin 1 of the field effect tube Q4 and the pins 2, 5 and 8 of the control chip U3 are connected.

6. The vehicle-mounted protocol fast charging circuit with a boost-buck function according to claim 5, characterized in that: The C port output circuit (S106) comprises the capacitor C6, the capacitor C7, the field effect tube Q3, the resistor R7 and the USB1-USB interface; The pins 2 and 11 of the USB2 are connected with the pins 3, 4 and 5 of the field effect tube Q3 and the pin 7 of the control chip U3, the pin 2 of the field effect tube Q3 is connected with the pin 2 of the resistor R7, the pin 1 of the resistor R7 is connected with the pin 6 of the control chip U3, the pin 4 of the USB1 is connected with the pin 40 of the control chip U3, the pins 5 and 7 of the USB1 are connected with the pin 39 of the control chip U3, the pins 6 and 8 of the USB1 are connected with the pin 38 of the control chip U3, and the pin 10 of the USB1 is connected with the pin 37 of the control chip U3.

7. The vehicle-mounted protocol fast charging circuit with a boost-buck function according to claim 6, characterized in that: The A port output circuit (S107) comprises the capacitor C11, the capacitor C12, the field effect tube Q4, the resistor R12 and the USB2-USB interface; The pin 1 of the USB2 is connected with the pins 3, 4 and 5 of the field effect tube Q4 and the pin 4 of the control chip U3, the pin 2 of the field effect tube Q4 is connected with the pin 2 of the resistor R12, the pin 1 of the resistor R12 is connected with the pin 3 of the control chip U3, the pin 2 of the USB2 is connected with the pin 36 of the control chip U3, and the pin 3 of the USB2 is connected with the pin 35 of the control chip U3.

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