Vehicle-mounted double-port high-power charging module for solving electromagnetic compatibility

Abstract

The invention relates to a vehicle-mounted double-port high-power charging module for solving electromagnetic compatibility. The vehicle-mounted double-port high-power charging module comprises a power supply connector, a power supply reverse protection circuit, an EMC protection loop, a first power supply conversion loop, a first charging protocol detection circuit, a second power supply conversion loop, a second charging protocol detection circuit, a Type C interface circuit and a USB A interface circuit. The EMC test standard can be met in a full-load test state, other electronic products on a vehicle cannot be interfered, and the anti-interference capability is enhanced; the charging requirements of all mobile phones, tablet computers and computers with Type C charging interfaces in the market can be met; an EMC protection loop with common-mode filtering and differential-mode filtering functions is designed to ensure that the electromagnetic interference generated by the product to the environment in the normal operation process cannot exceed a certain limit value and the product has a certain anti-interference capability to the electromagnetic interference existing in the environment, so that the electromagnetic compatibility of the product is integrally improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle chargers, and in particular relates to a vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility problems. Background Art

[0002] The interference to external devices caused by high-power multi-port vehicle chargers under full-load working conditions is greater than that caused by low-power chargers. They are also more susceptible to interference from external devices and are more difficult to pass EMC test standards.

[0003] It is difficult for a multi-port car charger to pass the electromagnetic compatibility test under high-power conditions. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a vehicle-mounted dual-port high-power charging module that solves the electromagnetic compatibility problem.

[0005] This vehicle-mounted dual-port high-power charging module that solves electromagnetic compatibility includes:

[0006] A power connector, a power reverse protection circuit, an EMC protection circuit, a first power conversion circuit, a first charging protocol detection circuit, a second power conversion circuit, a second charging protocol detection circuit, a Type C interface circuit, and a USB A interface circuit;

[0007] One end of the power connector is electrically connected to the power input end, and the other end is electrically connected to the input end of the power reverse protection circuit. The output end of the power reverse protection circuit is electrically connected to the input end of the EMC protection circuit. The output end of the EMC protection circuit is electrically connected to the input end of the first power conversion circuit and the second power conversion circuit. The first power conversion circuit is electrically connected to the first charging protocol detection circuit, and the first charging protocol detection circuit is electrically connected to the Type C interface circuit. The second power conversion circuit is electrically connected to the second charging protocol detection circuit.

[0008] The power supply reverse protection circuit is used to provide reverse protection for the input power supply;

[0009] EMC protection circuit, used to enhance EMC protection capability;

[0010] A first charging protocol detection circuit is used to identify a plug-in signal of a device to be charged at the Type C interface circuit, read a charging protocol corresponding to the device to be charged at the device to be charged, and transmit the plug-in signal of the device to be charged and a voltage corresponding to the charging protocol to a first power conversion circuit;

[0011] The first power conversion circuit is used to receive the plug-in signal of the device to be charged and the voltage level corresponding to the charging protocol sent by the first charging protocol detection circuit, adjust the charging power, charging current and output voltage of the Type C interface circuit; and control the Type C interface circuit to charge the device to be charged;

[0012] A Type C interface circuit, used to receive a control signal of the first power conversion circuit and charge the device to be charged;

[0013] The second charging protocol detection circuit is used to identify the plug-in signal of the device to be charged at the USB A interface circuit, read the voltage corresponding to the charging protocol corresponding to the device to be charged at the USB A interface circuit, and transmit the plug-in signal of the device to be charged and the charging protocol to the second power conversion circuit;

[0014] The second power conversion circuit is used to receive the plug-in signal of the device to be charged and the voltage level corresponding to the charging protocol sent by the second charging protocol detection circuit, adjust the charging power, charging current and output voltage of the USB A interface circuit; and control the USB A interface circuit to charge the device to be charged;

[0015] The USB A interface circuit is used to receive the control signal of the second power conversion circuit and charge the device to be charged.

[0016] Preferably, two EMC protection circuits are provided, the input ends of the two EMC protection circuits are electrically connected to the output end of the power reverse protection circuit, and the output ends of the two EMC protection circuits are electrically connected to the input end of the first power conversion circuit and the input end of the second power conversion circuit, respectively.

[0017] Preferably, each EMC protection circuit:

[0018] An input power connector J1 is provided, a first end of the input power connector J1 is grounded, a second end is suspended, and a third end is divided into two paths, one of which is electrically connected to the input end of the bidirectional TVS tube D1, and the other is electrically connected to the drain of the PMOS tube Q1; the base of the PMOS tube Q1 is divided into two paths, one of which is electrically connected to the input end of the resistor R1, and the other is electrically connected to the input end of the voltage regulator tube D2; the output end of the resistor R1 is grounded; the source electrode of the PMOS tube Q1 is divided into four paths, the first path is electrically connected to the output end of the voltage regulator tube D2, the second path is electrically connected to the input end of the capacitor C1, the third path is electrically connected to the input end of the capacitor C2, and the fourth path is electrically connected to one of the input ends of the common mode inductor L1; the output end of the capacitor C1, the output end of the capacitor C2 and the other input end of the common mode inductor L1 are all grounded;

[0019] One of the output ends of the common-mode inductor L1 is electrically connected to the input end of the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6 and the differential-mode inductor L2 in multiple ways, and the other output end of the common-mode inductor L1 is grounded; the output ends of the capacitors C3, C4, C5 and C6 are all grounded, and the output end of the differential-mode inductor L2 is electrically connected to the input end of the capacitor C7, the capacitor C8 and the electrolytic capacitor C9 in multiple ways; the output ends of the capacitors C7, C8 and the electrolytic capacitor C9 are all grounded;

[0020] The input power connector J1 is also electrically connected to the output ends of the first power conversion circuit and the second power conversion circuit;

[0021] The bidirectional TVS tube D1 is used to clamp the input voltage to the set voltage value by using the nonlinear characteristics of the device, suppressing the surge voltage generated during the load dump mode to protect the USB charging station; its response time can reach the ps level, which is the fastest among the voltage-limiting surge protection devices. When used for overvoltage protection of electronic circuits, its response speed can meet the requirements; the main parameters of the bidirectional TVS tube D1 include reverse breakdown voltage, maximum clamping voltage, instantaneous power, junction capacitance level response time, etc.

[0022] The common-mode inductor L1 is used to increase the impedance of the common-mode current path, produce a strong damping effect to attenuate the common-mode interference current and suppress the common-mode interference;

[0023] Differential mode inductor L2, used to suppress differential mode interference;

[0024] Preferably, the first power conversion circuit uses the SC8701Q chip as the power conversion chip, and the first charging protocol detection circuit uses the SC2021A chip as the protocol identification chip.

[0025] Preferably, the second power conversion circuit uses a CX8853 chip as a power conversion chip, and the second charging protocol detection circuit uses a FP6601Q chip as a protocol identification chip.

[0026] Preferably, the maximum charging power of the Type C interface circuit is 60W, the maximum charging current is 3A, and the output voltage is 5V, 9V, 15V or 20V.

[0027] Preferably, the maximum charging power of the USB A interface circuit is 18W, the maximum charging current is 3A, and the output voltage is 5V, 9V or 12V.

[0028] Preferably, the input voltage of the power input terminal is vehicle-mounted DC12V.

[0029] As a preferred embodiment: the power reverse protection circuit uses a MOS tube for reverse protection, which has low cost, small tube voltage drop and low loss.

[0030] Preferably, a backlight circuit matching the Type C interface circuit and the USB A interface circuit is provided, and the backlight circuit includes light-emitting components.

[0031] The beneficial effects of the present invention are:

[0032] The present invention is a dual-port design of Type C interface and USB A interface, which can meet the charging needs of different mobile phone devices and various types of interfaces; it can meet the EMC test standard under the full load test state, ensuring that it will not interfere with other electronic products on the car while enhancing the anti-interference ability; the Type C interface can provide a maximum charging power of 60W and support charging protocols such as PD3.0 and QC3.0; the USB A interface can provide a maximum charging power of 18W and support QC3.0 charging protocol; it can almost meet the charging needs of all mobile phones, tablets and new portable computers with Type C charging interfaces on the market;

[0033] The present invention designs an EMC protection circuit with common mode filtering and differential mode filtering functions to ensure that the electromagnetic interference generated by the product to the environment during normal operation does not exceed a certain limit and has a certain degree of anti-interference ability to the electromagnetic interference in the environment, thereby improving the electromagnetic compatibility performance of the product as a whole. It can ensure that the Type C interface and USB A interface can pass the EMC test standard under full load;

[0034] The present invention is also provided with a first power conversion circuit and a second power conversion circuit, which are used to receive the plug-in signal of the device to be charged sent by the corresponding charging protocol detection circuit and the corresponding voltage level required by the charging protocol, and adjust the charging power, charging current and output voltage of the Type C interface circuit or the USB A interface; and are used to control the Type C interface circuit or the USB A interface to charge the device to be charged, so as to realize safe and efficient energy conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the circuit principle diagram of the present invention;

[0036] Figure 2 It is a circuit schematic diagram of the EMC protection circuit of the present invention;

[0037] Figure 3 A circuit schematic diagram of a first power conversion circuit and a first charging protocol detection circuit;

[0038] Figure 4 A circuit schematic diagram of a second power conversion circuit and a second charging protocol detection circuit;

[0039] Figure 5 This is the EMC test curve without EMC protection;

[0040] Figure 6 This is an EMC test curve diagram of the present invention after EMC protection. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0042] Example 1

[0043] like Figure 1 As shown, a vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility includes: a power connector, a power reverse protection circuit (using a MOS tube for reverse protection), an EMC protection circuit, a first power conversion circuit (the power conversion chip is an SC8701Q chip), a first charging protocol detection circuit (the protocol identification chip is an SC2021A chip), a second power conversion circuit (the power conversion chip is a CX8853 chip), a second charging protocol detection circuit (the protocol identification chip is an FP6601Q chip), a Type C interface circuit and a USB A interface circuit; the maximum charging power of the Type C interface circuit is 60W, the maximum charging current is 3A, and the output voltage is 5V, 9V, 15V, and 20V; the maximum charging power of the USB A interface circuit is 18W, the maximum charging current is 3A, and the output voltage is 5V, 9V, and 12V;

[0044] One end of the power connector is electrically connected to the power input end (the input voltage is the vehicle-mounted DC12V), and the other end is electrically connected to the input end of the power reverse protection circuit. There are two EMC protection circuits in total. The input ends of the two EMC protection circuits are electrically connected to the output end of the power reverse protection circuit. The output ends of the two EMC protection circuits are electrically connected to the input end of the first power conversion circuit and the input end of the second power conversion circuit respectively; the first power conversion circuit is electrically connected to the first charging protocol detection circuit, and the first charging protocol detection circuit is electrically connected to the Type C interface circuit; the second power conversion circuit is electrically connected to the second charging protocol detection circuit;

[0045] The power supply reverse protection circuit is used to provide reverse protection for the input power supply;

[0046] EMC protection circuit, used to enhance EMC protection capability;

[0047] like Figure 2 As shown, each EMC protection circuit:

[0048] An input power connector J1 is provided, a first end of the input power connector J1 is grounded, a second end is suspended, and a third end is divided into two paths, one of which is electrically connected to the input end of the bidirectional TVS tube D1, and the other is electrically connected to the drain of the PMOS tube Q1; the base of the PMOS tube Q1 is divided into two paths, one of which is electrically connected to the input end of the resistor R1, and the other is electrically connected to the input end of the voltage regulator tube D2; the output end of the resistor R1 is grounded; the source electrode of the PMOS tube Q1 is divided into four paths, the first path is electrically connected to the output end of the voltage regulator tube D2, the second path is electrically connected to the input end of the capacitor C1, the third path is electrically connected to the input end of the capacitor C2, and the fourth path is electrically connected to one of the input ends of the common mode inductor L1; the output end of the capacitor C1, the output end of the capacitor C2 and the other input end of the common mode inductor L1 are all grounded;

[0049] One of the output ends of the common-mode inductor L1 is electrically connected to the input end of the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6 and the differential-mode inductor L2 in multiple ways, and the other output end of the common-mode inductor L1 is grounded; the output ends of the capacitors C3, C4, C5 and C6 are all grounded, and the output end of the differential-mode inductor L2 is electrically connected to the input end of the capacitor C7, the capacitor C8 and the electrolytic capacitor C9 in multiple ways; the output ends of the capacitors C7, C8 and the electrolytic capacitor C9 are all grounded;

[0050] The input power connector J1 is also electrically connected to the output ends of the first power conversion circuit and the second power conversion circuit;

[0051] The bidirectional TVS tube D1 is used to clamp the input voltage to the set voltage value by using the nonlinear characteristics of the device, suppressing the surge voltage generated during the load dump mode to protect the USB charging station; its response time can reach the ps level, which is the fastest among the voltage-limiting surge protection devices. When used for overvoltage protection of electronic circuits, its response speed can meet the requirements; the main parameters of the bidirectional TVS tube D1 include reverse breakdown voltage, maximum clamping voltage, instantaneous power, junction capacitance level response time, etc.

[0052] The common-mode inductor L1 is used to increase the impedance of the common-mode current path, produce a strong damping effect to attenuate the common-mode interference current and suppress the common-mode interference;

[0053] Differential mode inductor L2, used to suppress differential mode interference;

[0054] like Figure 3As shown, the first charging protocol detection circuit is used to identify the plug-in signal of the device to be charged at the Type C interface circuit, and read the charging protocol corresponding to the device to be charged there, and transmit the plug-in signal of the device to be charged and the charging protocol voltage to the first power conversion circuit; the first power conversion circuit is used to receive the plug-in signal of the device to be charged and the charging protocol voltage level sent by the first charging protocol detection circuit, adjust the charging power, charging current and output voltage of the Type C interface circuit; and control the Type C interface circuit to charge the device to be charged;

[0055] A Type C interface circuit, used to receive a control signal of the first power conversion circuit and charge the device to be charged;

[0056] like Figure 4 As shown, the second charging protocol detection circuit is used to identify the plug-in signal of the device to be charged at the USB A interface circuit, and read the charging protocol corresponding to the device to be charged at the USB A interface circuit, and transmit the plug-in signal of the device to be charged and the charging protocol voltage to the second power conversion circuit; the second power conversion circuit is used to receive the plug-in signal of the device to be charged and the charging protocol voltage level sent by the second charging protocol detection circuit, adjust the charging power, charging current and output voltage of the USB A interface circuit; and control the USB A interface circuit to charge the device to be charged;

[0057] The USB A interface circuit is used to receive the control signal of the second power conversion circuit and charge the device to be charged;

[0058] There is also a backlight circuit that matches the Type C interface circuit and the USB A interface circuit. The backlight circuit includes light-emitting components, and the backlight color is ice blue.

[0059] The Type C interface circuit, DC / DC voltage conversion circuit (SC8701Q chip) and charging protocol detection chip all use Nanxin chips, supporting fast charging protocols: PD3.0 / QC3.0, and have overvoltage protection, overcurrent protection and overtemperature protection functions;

[0060] The USB A interface circuit, DC / DC voltage conversion circuit (CX8853 chip) and charging protocol detection chip use Chengxinwei and Tianyu chips respectively, support fast charging protocol: QC3.0 / FCP, and have overvoltage protection, overcurrent protection and over-temperature protection functions.

[0061] The common-mode conducted disturbance of the switching power supply is mainly caused by dU / dt in the circuit, which is related to the voltage of the switching power supply. The higher the dU / dt, the higher the common-mode conducted disturbance. These dU / dts generate loops in the input / output line ends of the product, LISN, and reference ground through parasitic parameters, and common-mode current flows through the LISN. The differential-mode conducted disturbance of the switching power supply is mainly caused by dI / dt in the circuit, which is related to the power of the switching power supply. The higher the dI / dt, the higher the differential-mode conducted disturbance, which mainly occurs in the low-frequency band. For the conducted disturbance problem of the product in this embodiment (required to be under full load conditions), the current method is used to test the conducted disturbance), and its frequency band is mainly 0~245MHZ, such as Figure 5 As shown, this conducted disturbance can be either differential mode conducted disturbance or common mode conducted disturbance.

[0062] This embodiment adopts two-stage filtering common mode and differential mode filtering to filter out the conducted disturbance between the power input lines and the conducted disturbance between the power line and the reference ground line respectively; the EMC test curve after the EMC protection circuit of this embodiment is improved, as shown in FIG. Figure 6 As shown, it is clear that the EMC protection circuit designed in this embodiment can suppress both differential mode conducted disturbance and common mode conducted disturbance.

[0063] Example 2

[0064] The charging power of the Type C interface circuit is 27W, the maximum charging current is 3A, and the output voltage is 9V; the charging power of the USB A interface circuit is 18W, the charging current is 2A, and the output voltage is 9V; the rest is the same as Example 1.

[0065] Example 3

[0066] The charging power of the Type C interface circuit is 45W, the maximum charging current is 3A, and the output voltage is 15V; the charging power of the USB A interface circuit is 18W, the charging current is 1.5A, and the output voltage is 12V; the rest is the same as Example 1.

[0067] Example 4

[0068] The charging power of the Type C interface circuit is 60W, the maximum charging current is 3A, and the output voltage is 20V; the charging power of the USB A interface circuit is 18W, the charging current is 2A, and the output voltage is 9V; the rest is the same as Example 1.

Claims

1. A vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility, characterized in that: include: A power connector, a power reverse protection circuit, an EMC protection circuit, a first power conversion circuit, a first charging protocol detection circuit, a second power conversion circuit, a second charging protocol detection circuit, a Type C interface circuit, and a USB A interface circuit; One end of the power connector is electrically connected to the power input end, and the other end is electrically connected to the input end of the power reverse protection circuit. The output end of the power reverse protection circuit is electrically connected to the input end of the EMC protection circuit. The output end of the EMC protection circuit is electrically connected to the input end of the first power conversion circuit and the second power conversion circuit. The first power conversion circuit is electrically connected to the first charging protocol detection circuit, and the first charging protocol detection circuit is electrically connected to the Type C interface circuit. The second power conversion circuit is electrically connected to the second charging protocol detection circuit. The power supply reverse protection circuit is used to provide reverse protection for the input power supply; EMC protection circuit, used to enhance EMC protection capability; A first charging protocol detection circuit is used to identify a plug-in signal of a device to be charged at the Type C interface circuit, read a charging protocol corresponding to the device to be charged at the device to be charged, and transmit the plug-in signal of the device to be charged and a voltage corresponding to the charging protocol to a first power conversion circuit; The first power conversion circuit is used to receive the plug-in signal of the device to be charged and the voltage level corresponding to the charging protocol sent by the first charging protocol detection circuit, adjust the charging power, charging current and output voltage of the Type C interface circuit; and control the Type C interface circuit to charge the device to be charged; A Type C interface circuit, used to receive a control signal of the first power conversion circuit and charge the device to be charged; The second charging protocol detection circuit is used to identify the plug-in signal of the device to be charged at the USB A interface circuit, read the voltage corresponding to the charging protocol corresponding to the device to be charged at the USB A interface circuit, and transmit the plug-in signal of the device to be charged and the charging protocol to the second power conversion circuit; The second power conversion circuit is used to receive the plug-in signal of the device to be charged and the voltage level corresponding to the charging protocol sent by the second charging protocol detection circuit, adjust the charging power, charging current and output voltage of the USB A interface circuit; and control the USB A interface circuit to charge the device to be charged; The USB A interface circuit is used to receive the control signal of the second power conversion circuit and charge the device to be charged.

2. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: There are two EMC protection circuits in total, the input ends of the two EMC protection circuits are electrically connected to the output end of the power reverse protection circuit, and the output ends of the two EMC protection circuits are electrically connected to the input end of the first power conversion circuit and the input end of the second power conversion circuit respectively.

3. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 2 is characterized in that: Each EMC protection circuit: An input power connector J1 is provided, a first end of the input power connector J1 is grounded, a second end is suspended, and a third end is divided into two paths, one of which is electrically connected to the input end of the bidirectional TVS tube D1, and the other is electrically connected to the drain of the PMOS tube Q1; the base of the PMOS tube Q1 is divided into two paths, one of which is electrically connected to the input end of the resistor R1, and the other is electrically connected to the input end of the voltage regulator tube D2; the output end of the resistor R1 is grounded; the source electrode of the PMOS tube Q1 is divided into four paths, the first path is electrically connected to the output end of the voltage regulator tube D2, the second path is electrically connected to the input end of the capacitor C1, the third path is electrically connected to the input end of the capacitor C2, and the fourth path is electrically connected to one of the input ends of the common mode inductor L1; the output end of the capacitor C1, the output end of the capacitor C2 and the other input end of the common mode inductor L1 are all grounded; One of the output ends of the common-mode inductor L1 is electrically connected to the input end of the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6 and the differential-mode inductor L2 in multiple ways, and the other output end of the common-mode inductor L1 is grounded; the output ends of the capacitors C3, C4, C5 and C6 are all grounded, and the output end of the differential-mode inductor L2 is electrically connected to the input end of the capacitor C7, the capacitor C8 and the electrolytic capacitor C9 in multiple ways; the output ends of the capacitors C7, C8 and the electrolytic capacitor C9 are all grounded; The input power connector J1 is also electrically connected to the output ends of the first power conversion circuit and the second power conversion circuit; The bidirectional TVS tube D1 is used to protect the subsequent circuit from damage caused by the impact of transient high-voltage spike pulses. Common mode inductor L1, used to suppress common mode interference; Differential mode inductor L2 is used to suppress differential mode interference.

4. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: The first power conversion circuit uses the SC8701Q chip as the power conversion chip, and the first charging protocol detection circuit uses the SC2021A chip as the protocol identification chip.

5. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 4 is characterized in that: The second power conversion circuit uses the CX8853 chip as the power conversion chip, and the second charging protocol detection circuit uses the FP6601Q chip as the protocol identification chip.

6. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: The maximum charging power of the Type C interface circuit is 60W, the maximum charging current is 3A, and the output voltage is 5V, 9V, 15V or 20V.

7. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: The maximum charging power of the USBA interface circuit is 18W, the maximum charging current is 3A, and the output voltage is 5V, 9V, and 12V.

8. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: The input voltage of the power input terminal is vehicle-mounted DC12V.

9. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: The power reverse protection circuit uses MOS tube for reverse protection.

10. The vehicle-mounted dual-port high-power charging module for solving electromagnetic compatibility according to claim 1 is characterized in that: A backlight circuit matching the Type C interface circuit and the USB A interface circuit is also provided, and the backlight circuit includes light-emitting components.

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