CN213485247U

CN213485247U - Power interface circuit structure

Info

Publication number: CN213485247U
Application number: CN202022973127.5U
Authority: CN
Inventors: 胡超
Original assignee: Shanghai Visteon Automotive Electronic Systems Co ltd
Current assignee: Shanghai Visteon Automotive Electronic Systems Co ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-06-18
Anticipated expiration: 2030-12-11

Abstract

The utility model relates to a power interface circuit structure, which comprises a PCB board of a dashboard, wherein the PCB board is provided with a first common mode inductor, a first resistor and a second resistor, and the two resistors have zero impedance; the first pin and the second pin of the first common mode inductor are used for being connected with the anode and the cathode of the storage battery respectively; a second common mode inductor mounting area for mounting a second common mode inductor is reserved on the PCB, a first pin bonding pad of the second common mode inductor mounting area is connected with an ignition switch, a second pin bonding pad of the second common mode inductor mounting area is connected with the cathode of the storage battery, and a third pin bonding pad of the second common mode inductor mounting area is connected with the shell; the first resistor is connected between the first pin bonding pad and the fourth pin bonding pad of the second common-mode inductor mounting area to enable the first pin bonding pad and the fourth pin bonding pad to be in short circuit, and the second resistor is connected between the second pin bonding pad and the third pin bonding pad of the second common-mode inductor mounting area to enable the second pin bonding pad and the third pin bonding pad to be in short circuit. The advantages are that: therefore, the EMC experiment CE can be completed smoothly, quickly and efficiently, the development time is saved, and the project progress is not delayed.

Description

Power interface circuit structure

Technical Field

The utility model relates to an automobile instrument desk technical field especially relates to a power interface circuit structure.

Background

In general, differential mode inductance filtering is designed at the power inlet of the instrument, but interference generated by a common mode is ignored. Therefore, CE can be invalid when EMC experiments are conducted, the operation is inconvenient to modify due to the fact that the position of the common-mode inductor is not reserved, the consumed time is long, the verification is conducted again after the PCB is modified, the time period is long, the investment of manpower and material resources is large, and the project schedule is delayed.

The existing power inlet design has the following disadvantages:

1. interference due to common mode is not considered in advance

2. The operation of rectifying and reforming the CE after the failure of the EMC experiment is difficult, the time is too long, and the cost is high

3. When need change PCB after the rectification and verify EMC experiment CE again, it is long-lived, influence the defect that the project progress exists to prior art, propose the utility model discloses.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a purpose is to prior art structural shortcoming, provides a power interface circuit structure, need design common mode inductance and differential mode inductance simultaneous filtering at the front end when the design to reach best effect.

In order to achieve the above object, an embodiment of the present invention provides a power interface circuit structure, which is realized by the following technical solution:

the utility model provides a power interface circuit structure, includes panel board PCB board, its characterized in that: the PCB is provided with a first common-mode inductor, a first resistor and a second resistor, wherein the two resistors have zero impedance; the first pin and the second pin of the first common-mode inductor are used for being connected with the anode and the cathode of the storage battery respectively; a second common mode inductor mounting area used for mounting a second common mode inductor is reserved on the PCB, a first pin bonding pad of the second common mode inductor mounting area is connected with an ignition switch, a second pin bonding pad of the second common mode inductor mounting area is connected with the cathode of the storage battery, a third pin bonding pad of the second common mode inductor mounting area is connected with the shell, and a fourth pin bonding pad of the third common mode inductor mounting area is connected with the anode of the first diode, the anode of the second diode and the anode of the third diode; the first resistor is connected between a first pin bonding pad and a fourth pin bonding pad of the second common-mode inductor mounting area to enable the first pin bonding pad and the fourth pin bonding pad to be in short circuit, and the second resistor is connected between a second pin bonding pad and a third pin bonding pad of the second common-mode inductor mounting area to enable the second pin bonding pad and the third pin bonding pad to be in short circuit.

A fourth pin of the third common mode inductor is connected with the shell, and the fourth pin of the third common mode inductor is connected with the anode of a fourth diode and the anode of a fifth diode; and the cathode of the second diode is connected with the cathode of the fifth diode.

Compared with the prior art, the beneficial effects of the utility model are that: and when a schematic diagram is drawn in the early stage, a proper common-mode inductor is selected. By designing the reserved circuit in advance, the possibility of changing the PCB during the EMC experiment CE is low, so that the EMC experiment CE can be completed smoothly, quickly and efficiently, the development time is saved, and the project schedule is not delayed.

Drawings

The above features and advantages of the present invention will become more apparent and readily appreciated from the following description of the exemplary embodiments thereof taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic circuit diagram of an embodiment of the present invention;

FIG. 2 is a front circuit diagram of a PCB board according to an embodiment of the present invention;

fig. 3 is a circuit diagram of the back side of the PCB according to the embodiment of the present invention.

Detailed Description

The invention will be described in further detail below with reference to the accompanying drawings so as to facilitate understanding by those skilled in the art:

reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1-3, the power interface circuit structure provided in this embodiment includes a dashboard PCB board, and the PCB board is provided with a first common mode inductor L60103. The first pin and the second pin of the first common mode inductor L60103 are used for being connected to the positive and negative electrodes BATT and BAT _ GND of the storage battery, respectively. A fourth pin of the third pin of the first common mode inductor L60103 is connected to the positive electrode of the fourth diode D60102 and the positive electrode of the fifth diode D60101.

A second common mode inductor mounting area for mounting a second common mode inductor L60102 is reserved on the PCB. The first pin pad of the second common mode inductor mounting area is connected with the ignition switch IGN, the second pin pad of the second common mode inductor mounting area is connected with the cathode BAT _ GND of the storage battery, the third pin pad of the second common mode inductor mounting area is connected with the shell, and the fourth pin pad of the second common mode inductor mounting area is connected with the anode of the first diode D60105, the anode of the second diode D60104 and the anode of the third diode D60109. The cathode of the first diode D60105 is connected with the cathode of the fourth diode D60102, and the cathode of the second diode D60104 is connected with the cathode of the fifth diode D60101.

In addition, the PCB is further provided with a first resistor R60111 and a second resistor R60112 with zero impedance. The first resistor R60111 is connected between the first pin pad and the fourth pin pad of the second common mode inductor mounting area to short the first pin pad and the fourth pin pad, and the second resistor R60112 is connected between the second pin pad and the third pin pad of the second common mode inductor mounting area to short the second pin pad and the third pin pad.

Through the structure, compared with a traditional power inlet circuit, two common-mode inductors, namely a first common-mode inductor L60103 and a second common-mode inductor L60102, are added for filtering. The GND loop is divided, the BAT _ GND is divided into GND after passing through the common-mode inductor, and the design has obvious effect on CE and ESD in EMC experimental items.

The second common mode inductor L60102, the first resistor R60111, and the second resistor R60112 are all designed to be reserved (when the second common mode inductor L60102 is used, the first resistor R60111 and the second resistor R60112 are not attached, and vice versa).

When the first experiment is performed, the second common mode inductor L60102 may be removed, the first resistor R60111 and the second resistor R60112 may be used to jump the second common mode inductor L60102 through a 0 ohm resistor, and if the CE experiment passes, mass production of the second common mode inductor L60102 is considered; if the common mode inductor L60102 fails, the first resistor R60111 and the second resistor R60112 are attached, and the first resistor R60111 and the second resistor R60112 are disconnected for testing, and if the test is passed, the first resistor R60111 and the second resistor R60112 are not mounted, and the second common mode inductor L60102 is mounted on a chip.

It should be noted that the above is a detailed description of the present invention, and it should not be considered that the present invention is limited to the specific embodiments, and those skilled in the art can make various modifications and variations on the above embodiments without departing from the scope of the present invention.

Claims

1. The utility model provides a power interface circuit structure, includes panel board PCB board, its characterized in that: the PCB is provided with a first common-mode inductor, a first resistor and a second resistor, wherein the two resistors have zero impedance; the first pin and the second pin of the first common-mode inductor are used for being connected with the anode and the cathode of the storage battery respectively; a second common mode inductor mounting area used for mounting a second common mode inductor is reserved on the PCB, a first pin bonding pad of the second common mode inductor mounting area is connected with an ignition switch, a second pin bonding pad of the second common mode inductor mounting area is connected with the cathode of the storage battery, a third pin bonding pad of the second common mode inductor mounting area is connected with the shell, and a fourth pin bonding pad of the third common mode inductor mounting area is connected with the anode of the first diode, the anode of the second diode and the anode of the third diode; the first resistor is connected between a first pin bonding pad and a fourth pin bonding pad of the second common-mode inductor mounting area to enable the first pin bonding pad and the fourth pin bonding pad to be in short circuit, and the second resistor is connected between a second pin bonding pad and a third pin bonding pad of the second common-mode inductor mounting area to enable the second pin bonding pad and the third pin bonding pad to be in short circuit.

2. A power interface circuit arrangement according to claim 1, wherein: a fourth pin of the third common mode inductor is connected with the shell, and the fourth pin of the third common mode inductor is connected with the anode of a fourth diode and the anode of a fifth diode; and the cathode of the second diode is connected with the cathode of the fifth diode.