Gallium nitride charging circuit for solving EMI (Electro-Magnetic Interference) conduction

Abstract

The utility model relates to a gallium nitride charging circuit for solving EMI conduction, which comprises a circuit board, an EMI anti-interference circuit and a gallium nitride switch tube, the EMI anti-interference circuit and the gallium nitride switch tube are arranged on the circuit board, an isolation wire is arranged on the circuit board between the EMI anti-interference circuit and the gallium nitride switch tube Q1, and the isolation wire is grounded. According to the technical scheme of the utility model, the distance between the switching tube and the EMI circuit can be kept very close while electromagnetic interference is shielded, so that the size of a corresponding PCB can be smaller.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit control, and in particular to a gallium nitride charging circuit for solving EMI conduction problems. Background Art

[0002] GaN switches will generate high electromagnetic interference when working at high speed. To solve this problem, an EMI anti-interference circuit consisting of an X2 capacitor and a common-mode inductor group is generally added to the input end of the switching power supply. The conduction of the power input is suppressed by increasing the input common-mode inductor inductance; another method is to keep a relatively long distance between the GaN switch and the input EMI circuit, which will greatly increase the size of the power supply.

[0003] The current trend of switching power supplies is miniaturization. Simply increasing the input common-mode inductance means that a better magnetic core or additional coils are needed, which will reduce the overall efficiency of the power supply. If the GaN switch tube and the input EMI circuit are kept at a greater distance, more PCB board space will be required, which is not conducive to the miniaturization of the power supply. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0005] To this end, the purpose of the utility model is to provide a gallium nitride charging circuit that solves EMI conduction, which can shield electromagnetic interference while keeping the distance between the switch tube and the EMI circuit very close, so that the corresponding PCB volume can be made smaller.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model provides a gallium nitride charging circuit for solving EMI conduction, including a circuit board and an EMI anti-interference circuit and a gallium nitride switch tube installed on the circuit board, characterized in that an isolation trace is arranged on the circuit board between the EMI anti-interference circuit and the gallium nitride switch tube Q1, and the isolation trace is grounded.

[0007] In the above technical solution, preferably, the distance between the EMI anti-interference circuit and the isolation wiring is greater than 1 mm.

[0008] In any of the above technical solutions, preferably, the distance between the gallium nitride switch tube and the isolation wiring is greater than 1 mm.

[0009] In any of the above technical solutions, preferably, the EMI anti-interference circuit includes common-mode inductors LF1 and LF2, resistors R9 and R11, diodes D1 and D2, and capacitors X2 and CX2; wherein the resistors R9 and R11 connected in series are connected in series and the diodes D1 and D2 are connected in parallel to the common-mode inductors LF1 and LF2.

[0010] In any of the above technical solutions, preferably, the circuit board is also provided with a PMW control circuit which is composed of at least a PMW chip U2, capacitors C1, C2, C5 and C8, resistors R1-R4, R6 and a transistor U1-B.

[0011] In any of the above technical solutions, preferably, resistors R15, FB1, R16 and a diode D3 are connected between the gallium nitride switch tube Q1 and the PMW chip U2; wherein the resistor R16 is connected in series with the diode D3 and then connected in parallel to the resistor R15.

[0012] In any of the above technical solutions, preferably, a sampling circuit composed of at least resistors R5, R8 and RS1 and a capacitor C10 is further provided on the circuit board, and the sampling circuit is grounded.

[0013] In any of the above technical solutions, preferably, the circuit board is also provided with an EMI absorption circuit which is composed of at least an inductor T1, capacitors C11, C12 and EC2, resistors R10 and R7A, and a diode D5.

[0014] In any of the above technical solutions, preferably, a rectifier circuit composed of at least rectifier tubes BD1 and BD2 is also provided on the circuit board of the EMI absorption circuit and the EMI anti-interference circuit.

[0015] The advantages of the gallium nitride charging circuit for solving EMI conduction provided by the utility model compared with the prior art are: by adding an isolation copper foil trace to the ground on the PCB board, electromagnetic interference can be shielded, and the distance between the switch tube and the EMI circuit can be kept very close, so the corresponding PCB volume can be made smaller; no large inductance is required, the waste of copper wire is reduced, and the environment is protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic diagram of the structure involved in the embodiment of the utility model is shown;

[0018] Figure 2 A schematic diagram of the circuit structure involved in the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1 to Figure 2 As shown, according to an embodiment of the utility model, a gallium nitride charging circuit for solving EMI conduction includes a circuit board 1 and an EMI anti-interference circuit and a gallium nitride switch tube installed on the circuit board 1, and an isolation trace 2 is arranged on the circuit board between the EMI anti-interference circuit and the gallium nitride switch tube Q1, and the isolation trace is grounded.

[0022] In the above embodiment, preferably, the distance between the EMI anti-interference circuit and the isolation trace is greater than 1 mm.

[0023] In any of the above embodiments, preferably, the distance between the gallium nitride switch tube and the isolation wiring is greater than 1 mm.

[0024] In any of the above embodiments, preferably, the EMI anti-interference circuit includes common-mode inductors LF1 and LF2, resistors R9 and R11, diodes D1 and D2, and capacitors X2 and CX2; wherein the resistors R9 and R11 connected in series are connected in series and the diodes D1 and D2 are connected in parallel to the common-mode inductors LF1 and LF2.

[0025] In any of the above embodiments, preferably, the circuit board is further provided with a PMW control circuit which is composed of at least a PMW chip U2, capacitors C1, C2, C5 and C8, resistors R1-R4, R6 and a transistor U1-B.

[0026] In any of the above embodiments, preferably, resistors R15, FB1, R16 and a diode D3 are connected between the gallium nitride switch tube Q1 and the PMW chip U2; wherein the resistor R16 is connected in series with the diode D3 and then connected in parallel to the resistor R15.

[0027] In any of the above embodiments, preferably, a sampling circuit composed of at least resistors R5, R8 and RS1 and a capacitor C10 is further provided on the circuit board, and the sampling circuit is grounded.

[0028] In any of the above embodiments, preferably, the circuit board is further provided with an EMI absorption circuit which is composed of at least an inductor T1, capacitors C11, C12 and EC2, resistors R10 and R7A, and a diode D5.

[0029] In any of the above embodiments, preferably, a rectifier circuit composed of at least rectifier tubes BD1 and BD2 is further provided on the circuit board of the EMI absorption circuit and the EMI anti-interference circuit.

[0030] The advantages of the gallium nitride charging circuit for solving EMI conduction provided by the utility model compared with the prior art are: by adding an isolation copper foil trace to the ground on the PCB board, electromagnetic interference can be shielded, and the distance between the switch tube and the EMI circuit can be kept very close, so the corresponding PCB volume can be made smaller; no large inductance is required, the waste of copper wire is reduced, and the environment is protected.

[0031] In the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gallium nitride charging circuit for solving EMI conduction, comprising a circuit board, an EMI anti-interference circuit and a gallium nitride switch tube installed on the circuit board, characterized in that: An isolation line is arranged on the circuit board between the EMI anti-interference circuit and the gallium nitride switch tube Q1, and the isolation line is grounded.

2. The gallium nitride charging circuit for solving EMI conduction according to claim 1, characterized in that: The distance between the EMI anti-interference circuit and the isolation wiring is greater than 1 mm.

3. The gallium nitride charging circuit for solving EMI conduction according to claim 1 or 2, characterized in that: The distance between the gallium nitride switch tube and the isolation wiring is greater than 1 mm.

4. The gallium nitride charging circuit for solving EMI conduction according to claim 1 or 2, characterized in that: The EMI anti-interference circuit includes common-mode inductors LF1 and LF2, resistors R9 and R11, diodes D1 and D2, and capacitors X2 and CX2; wherein the resistors R9 and R11 connected in series are connected in series and the diodes D1 and D2 are connected in parallel to the common-mode inductors LF1 and LF2.

5. The gallium nitride charging circuit for solving EMI conduction according to claim 1 or 2, characterized in that: The circuit board is also provided with a PMW control circuit which is composed of at least a PMW chip U2, capacitors C1, C2, C5 and C8, resistors R1-R4, R6 and a transistor U1-B.

6. The gallium nitride charging circuit for solving EMI conduction according to claim 5, characterized in that: Resistors R15, FB1, R16 and a diode D3 are connected between the gallium nitride switch tube Q1 and the PMW chip U2; wherein the resistor R16 is connected in series with the diode D3 and then connected in parallel with the resistor R15.

7. The gallium nitride charging circuit for solving EMI conduction according to claim 1 or 2, characterized in that: The circuit board is also provided with a sampling circuit consisting of at least resistors R5, R8 and RS1 and a capacitor C10, and the sampling circuit is grounded.

8. The gallium nitride charging circuit for solving EMI conduction according to claim 1 or 2, characterized in that: The circuit board is also provided with an EMI absorption circuit which is composed of at least an inductor T1, capacitors C11, C12 and EC2, resistors R10 and R7A, and a diode D5.

9. The gallium nitride charging circuit for solving EMI conduction according to claim 8, characterized in that: A rectifier circuit composed of at least rectifier tubes BD1 and BD2 is also provided on the circuit board of the EMI absorption circuit and the EMI anti-interference circuit.

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