阅读说明：本技术 一种滤波电路以及车载电子设备 (Filter circuit and vehicle-mounted electronic equipment ) 是由 轩言成 王德臣 赵乐乐 于 2020-05-29 设计创作，主要内容包括：本申请实施例公开了一种滤波电路以及车载电子设备,用于电路领域。本申请实施例包括：滤波电路中包括降噪装置。当电流流经该降噪装置以及共模电感的连接点时,电流中部分频段的电流流经该降噪装置之后通过电容导入地面。这样,减少了流经共模电感的此部分频段的电流,从而缓解了电容和共模电感之间的谐振,减小了谐振频段的电磁噪声,提升了输出信号的信噪比。(The embodiment of the application discloses a filter circuit and vehicle-mounted electronic equipment, and belongs to the field of circuits. The embodiment of the application comprises the following steps: the filter circuit comprises a noise reduction device. When current flows through the noise reduction device and the connection point of the common mode inductor, the current in the middle frequency band of the current flows through the noise reduction device and then is led into the ground through the capacitor. Therefore, the current flowing through the part of the frequency band of the common mode inductor is reduced, so that the resonance between the capacitor and the common mode inductor is relieved, the electromagnetic noise of the resonance frequency band is reduced, and the signal-to-noise ratio of the output signal is improved.)

1. A filter circuit, comprising: the noise reduction circuit comprises a first capacitor module and an inductor module, wherein the first capacitor module comprises a first capacitor and a second capacitor, and the inductor module comprises a common-mode inductor, a first noise reduction device and a second noise reduction device;

the first capacitor is connected with the second capacitor in series;

the first end of the first capacitor is connected with the first end of the first noise reduction device and the first end of the common-mode inductor;

the first end of the second capacitor is connected with the first end of the second noise reduction device and the second end of the common-mode inductor;

the second end of the first noise reduction device is connected with the third end of the common-mode inductor;

the second end of the second noise reduction device is connected with the fourth end of the common-mode inductor;

the second end of the first capacitor is connected with the second end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are grounded;

when a first current flows through the first noise reduction device and a connection point of the common mode inductor, the current of a first current middle frequency band flows through the first noise reduction device and then is led into the ground through the first capacitor;

when a second current flows through the second noise reduction device and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second noise reduction device and then is conducted into the ground through the second capacitor.

2. The filter circuit of claim 1, further comprising a second capacitance module comprising a third capacitance and a fourth capacitance;

the third capacitor is connected with the fourth capacitor in series;

the first end of the third capacitor is connected with the second end of the first noise reduction device and the third end of the common-mode inductor;

a first end of the fourth capacitor is connected with a second end of the second noise reduction device and a fourth end of the common mode inductor;

and the second end of the third capacitor is connected with the second end of the fourth capacitor, and the second ends of the third capacitor and the fourth capacitor are grounded.

3. The filter circuit according to claim 1 or 2, wherein the first noise reducing means comprises a first resistor and the second noise reducing means comprises a second resistor;

when a first current flows through the first resistor and the connection point of the common mode inductor, the current of the middle frequency band of the first current flows through the first resistor and then is led into the ground through the first capacitor;

when a second current flows through the second resistor and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second resistor and then is conducted into the ground through the second capacitor.

4. The filter circuit of claim 1 or 2, wherein the first noise reduction means comprises a first bead and the second noise reduction means comprises a second bead;

when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, the current of a middle frequency division band of the first current flows through the first magnetic bead and then is led into the ground through the first capacitor;

when a second current flows through the second magnetic bead and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second magnetic bead and then is conducted to the ground through the second capacitor.

5. The filter circuit according to claim 1 or 2, wherein the first noise reducing means comprises a fifth capacitor and the second noise reducing means comprises a sixth capacitor;

when a first current flows through the fifth capacitor and the connection point of the common mode inductor, the current of the middle frequency band of the first current flows through the fifth capacitor and then is led into the ground through the first capacitor;

when a second current flows through the connection point of the sixth capacitor and the common mode inductor, the current of the middle frequency band of the second current flows through the sixth capacitor and then is conducted to the ground through the second capacitor.

6. The filter circuit according to claim 1 or 2, wherein the first noise reduction means comprises a first resistor and a fifth capacitor, and the second noise reduction means comprises a second resistor and a sixth capacitor;

the first resistor is connected with the fifth capacitor in series;

the second resistor is connected with the sixth capacitor in series;

when a first current flows through a connection point of the fifth capacitor and the common mode inductor, or when the first current flows through a connection point of the first resistor and the common mode inductor, the current of a middle frequency band of the first current flows through the fifth capacitor and the first resistor, and then is led into the ground through the first capacitor;

when a second current flows through the connection point of the sixth capacitor and the common mode inductor, or when the second current flows through the connection point of the second resistor and the common mode inductor, the current of the middle frequency band of the second current flows through the sixth capacitor and the second resistor, and then is conducted to the ground through the second capacitor.

7. The filter circuit of claim 1 or 2, wherein the first noise reduction device comprises a first resistor and a first magnetic bead, and the second noise reduction device comprises a second resistor and a second magnetic bead;

the first resistor is connected with the first magnetic bead in series;

the second resistor is connected with the second magnetic beads in series;

when a first current flows through the connection point of the first resistor and the common-mode inductor, or when the first current flows through the connection point of the first magnetic bead and the common-mode inductor, the current of a middle frequency band of the first current flows through the first resistor and the first magnetic bead and then is conducted to the ground through the first capacitor;

when a second current flows through the connection point of the second resistor and the common-mode inductor, or when the second current flows through the connection point of the second magnetic bead and the common-mode inductor, the current of a middle frequency band of the second current flows through the second resistor and the second magnetic bead and then is conducted to the ground through the second capacitor.

8. The filter circuit according to claim 1 or 2, wherein the first noise reducing means comprises a first resistor and a first inductor, and the second noise reducing means comprises a second resistor and a second inductor;

the first resistor is connected with the first inductor in series;

the second resistor is connected with the second inductor in series;

when a first current flows through the connection point of the first resistor and the common mode inductor, or when the first current flows through the connection point of the first inductor and the common mode inductor, the current of a middle frequency band of the first current flows through the first resistor and the first inductor and then is led into the ground through the first capacitor;

when a second current flows through the connection point of the second resistor and the common mode inductor, or when the second current flows through the connection point of the second inductor and the common mode inductor, the current of the middle frequency band of the second current flows through the second resistor and the second inductor, and then is conducted to the ground through the second capacitor.

9. The filter circuit according to claim 1 or 2, wherein the first noise reduction device comprises a first magnetic bead and a fifth capacitor, and the second noise reduction device comprises a second magnetic bead and a sixth capacitor;

the first magnetic bead is connected with the fifth capacitor in series;

the second magnetic bead is connected with the sixth capacitor in series;

when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, or when the first current flows through a connection point of the fifth capacitor and the common-mode inductor, the current of a middle frequency division band of the first current flows through the first magnetic bead and the fifth capacitor and then is led into the ground through the first capacitor;

when a second current flows through the connection point of the second magnetic bead and the common-mode inductor, or when the second current flows through the connection point of the sixth capacitor and the common-mode inductor, the current of the middle frequency band of the second current flows through the second magnetic bead and the sixth capacitor, and then is conducted to the ground through the second capacitor.

10. The filter circuit of claim 1 or 2, wherein the first noise reduction device comprises a first magnetic bead and a first inductor, and the second noise reduction device comprises a second magnetic bead and a second inductor;

the first magnetic bead is connected with the first inductor in series;

the second magnetic bead is connected with the second inductor in series;

when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, or when the first current flows through a connection point of the first inductor and the common-mode inductor, the current of a middle frequency band of the first current flows through the first magnetic bead and the first inductor, and then is conducted to the ground through the first capacitor;

when a second current flows through the connection point of the second magnetic bead and the common-mode inductor, or when the second current flows through the connection point of the second inductor and the common-mode inductor, the current of a middle frequency band of the second current flows through the second magnetic bead and the second inductor, and then is conducted to the ground through the second capacitor.

11. The filter circuit according to claim 1 or 2, wherein the first noise reduction device comprises a fifth capacitor and a first inductor, and the second noise reduction device comprises a sixth capacitor and a second inductor;

the fifth capacitor is connected with the first inductor in series;

the sixth capacitor is connected with the second inductor in series;

when a first current flows through a connection point of the fifth capacitor and the common mode inductor, or when the first current flows through a connection point of the first inductor and the common mode inductor, the current of a middle frequency band of the first current flows through the fifth capacitor and the first inductor, and then is led into the ground through the first capacitor;

when a second current flows through a connection point of the sixth capacitor and the common mode inductor, or when the second current flows through a connection point of the second inductor and the common mode inductor, the current of a middle frequency band of the second current flows through the sixth capacitor and the second inductor, and then is conducted to the ground through the second capacitor.

12. An in-vehicle electronic component characterized by comprising: a first functional module, a filter circuit and a power module, the filter circuit being as claimed in any one of claims 1 to 11.