CN210867501U

CN210867501U - Power interface filter circuit of electric power steering system controller

Info

Publication number: CN210867501U
Application number: CN201921695610.2U
Authority: CN
Inventors: 查义炜; 龚德林; 张彤蕾; 吴夏青; 景彩云; 孙瑞
Original assignee: Bosch Huayu Steering Systems Co Ltd
Current assignee: Bosch Huayu Steering Systems Co Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-06-26
Anticipated expiration: 2029-10-11

Abstract

The utility model relates to a battery power supply circuit technical field, specific say a power source interface filter circuit of electric power steering system controller. Compared with the prior art, the utility model, can be so that electric power steering controller electromagnetic compatibility performance is up to standard, neither can receive external electromagnetic noise interference, can not launch too much electromagnetic noise again and influence other equipment, simultaneously the utility model discloses the realization cost is lower, only adopts electric capacity inductance part, and the reliability is high. Electric power assisted controller process the utility model discloses a power filter circuit performance on the time domain reduces ripple current for can providing stable motor control three-phase bridge direct current voltage, and this and then can motor control more steady, and the noise is lower.

Description

Power interface filter circuit of electric power steering system controller

Technical Field

The utility model relates to a battery power supply circuit technical field, specific say a power source interface filter circuit of electric power steering system controller.

Background

With the gradual popularization of automobile electromotion, vehicle-mounted electronic devices are more and more, the frequency of the electronic devices is higher and the power of the electronic devices is higher and higher, so that the interior of a whole automobile is full of various electromagnetic interferences, and serious electromagnetic interferences can cause an electronic controller in the automobile to work abnormally, such as damages to electronic devices, wrong and unexpected instruction signals, abnormal use of an automobile radio or a GPS (global positioning system), and the like. Since it is always impossible to influence the safety of the vehicle if electromagnetic interference influences the general electronic devices and influences the safety of the vehicle if the functional safety systems of the vehicle are influenced, the electromagnetic compatibility of the onboard electronic devices is becoming more and more important, especially for the control of the functional safety systems.

The existing power interface filter circuits are simple, the filtering of interference of vehicle-mounted electronic devices to various frequency bands is not fully considered, and meanwhile, the cost of some filter circuits is high, which cannot be realized in automobile electronic products. The utility model provides a power steering control system's filter circuit can the electromagnetic noise interference of each frequency channel of filtering, can realize with lower cost simultaneously.

Disclosure of Invention

The utility model discloses a prior art's a difficult problem has been broken through, has designed a power source interface filter circuit of electric power steering system controller, its characterized in that: the connection is carried out as follows: the VBAT port is divided into nine paths, which are respectively connected to one end of a capacitor C1, one end of a capacitor C2, one end of a capacitor C3, one end of a capacitor C4, one end of a capacitor C5, one end of a capacitor C6, one end of a capacitor C7, one end of a capacitor C8, and one end of an inductor L1, the other end of a capacitor C1 is divided into four paths, which are respectively connected to HGND, one end of a capacitor C14, the other end of a capacitor C2, and one end of a capacitor C15, the other end of a capacitor C14 is merged with the other end of a capacitor C15 and then grounded, the other end of a capacitor C3 is divided into ten paths, which are respectively connected to ground, the other end of a capacitor C3, one end of a capacitor C3, and the other end of a capacitor L3, which are respectively connected to six paths of, The other end of the capacitor C10, one end of the capacitor C11, one end of the capacitor C12, one end of the capacitor C13 and a VBAT1 port are connected, the other end of the capacitor C16 is connected with the HGND1, the other end of the capacitor C17 is connected with the HGND2, the other end of the capacitor C18 is connected with the HGND3, and the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are grounded after being gathered.

The HGND, the HGND1, the HGND2 and the HGND3 are screw holes on the metal shell.

Compared with the prior art, the utility model, can be so that electric power steering controller electromagnetic compatibility performance is up to standard, neither can receive external electromagnetic noise interference, can not launch too much electromagnetic noise again and influence other equipment, simultaneously the utility model discloses the realization cost is lower, only adopts electric capacity inductance part, and the reliability is high. Electric power assisted controller process the utility model discloses a power filter circuit performance on the time domain reduces ripple current for can providing stable motor control three-phase bridge direct current voltage, and this and then can motor control more steady, and the noise is lower.

Drawings

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

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, the utility model designs a power interface filter circuit of electric power steering system controller, connects according to following method: the VBAT port is divided into nine paths, which are respectively connected to one end of a capacitor C1, one end of a capacitor C2, one end of a capacitor C3, one end of a capacitor C4, one end of a capacitor C5, one end of a capacitor C6, one end of a capacitor C7, one end of a capacitor C8, and one end of an inductor L1, the other end of a capacitor C1 is divided into four paths, which are respectively connected to HGND, one end of a capacitor C14, the other end of a capacitor C2, and one end of a capacitor C15, the other end of a capacitor C14 is merged with the other end of a capacitor C15 and then grounded, the other end of a capacitor C3 is divided into ten paths, which are respectively connected to ground, the other end of a capacitor C3, one end of a capacitor C3, and the other end of a capacitor L3, which are respectively connected to six paths of, The other end of the capacitor C10, one end of the capacitor C11, one end of the capacitor C12, one end of the capacitor C13 and a VBAT1 port are connected, the other end of the capacitor C16 is connected with the HGND1, the other end of the capacitor C17 is connected with the HGND2, the other end of the capacitor C18 is connected with the HGND3, and the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are grounded after being gathered.

The utility model discloses well VBAT port still is connected with car 12V battery, provides the power of whole circuit, and VBAT1 port then still is connected with steering control motor drive three-phase power bridge, forms the circuit return circuit.

The utility model discloses well HGND, HGND1, HGND2, HGND3 are the screw hole on the metal casing.

C1 and C14 are two 10uF ceramic capacitors and form a Y capacitor filter, the Y capacitor mainly functions in filtering common mode noise on a power line and a ground line of the controller, the 10uF capacitor mainly provides a low-impedance channel for low-frequency noise below 1MHz, and low-frequency common mode noise which exists on the power line and the ground line simultaneously and has the same direction can be led into a shell of the controller through the Y capacitor and returns to the battery through a low-impedance loop of the shell.

C2 and C15 are two 1nF ceramic capacitors which also form a Y capacitor filter, the 1nF capacitor mainly aims at the noise above 30MHz, the high-frequency noise existing on the power line and the ground line can form a low-impedance path through C2 and C15 to be led into the shell, and the high-frequency noise returns to the battery through a low-impedance loop of the shell.

C3, C4 and C5 are a group of differential mode capacitors, C3 is a ceramic capacitor of 4.7nF, C4 is a ceramic capacitor of 1nF, and C5 is a ceramic capacitor of 6.8 nF. The three capacitors are connected between the power line and the ground line of the controller, and respectively generate low-impedance channels aiming at the interference noise of different frequency bands existing on the power line, are led into the ground line of the controller and then return to the battery.

C6 is a 330uF electrolytic capacitor for DC voltage stabilization, the stabilized voltage on the electrolytic capacitor is mainly used for supplying power to the digital part of the controller, the digital part of the controller comprises a switch power supply for generating various voltages required by the digital system from the battery voltage, the electrolytic capacitor stores the DC voltage required by the switch power supply of the digital part, the ripple wave of the digital system power supply is reduced, and the low-frequency noise is reduced.

C7, C8, L1, C9 and C10 form a pi-type filter, and the parameters of the pi-type filter are designed, so that the noise frequency band to be filtered can be filtered in a targeted manner, and the noise signal is led to the ground wire of the controller through the pi-type filter and then returns to the battery.

C16, C17, C18 are three filter capacitors where the controller is placed in a plane with the chassis, since there is typically much noise on the ground of the controller, these three capacitors provide a low impedance return path for the noise on the ground to the chassis, which then returns to the battery through the chassis. This is important in that the ground or ground plane of the controller forms a low impedance loop to the housing through a capacitor.

C11, C12 and C13 are three 2200uF large electrolytic capacitors and mainly provide input voltage for controlling a three-phase bridge of the power-assisted motor, the three capacitors correspond to three phases of the motor-controlled three-phase bridge, namely three phases of U, V and W, direct current on the three capacitors is changed into alternating current voltage through the three-phase bridge to drive the motor, alternating current is mainly provided by the three capacitors, and the three large capacitors ensure the stability of the input voltage for controlling the power-assisted motor and the stability of the motor control.

The utility model discloses the casing ground of controller is HGND, HGND1 respectively, HGND2, HGND3, corresponds to the three screw hole on the controller respectively, and through twist electrically conductive screw to the controller casing in these several screw holes at the controller, just realized that the noise on power cord on the controller or the ground wire leads to on the casing through electric capacity. The low impedance connection is also important here to ensure that noise on the controller can be directed through the screw hole location into the chassis and back to the battery with low impedance.

The utility model discloses just the controller of the electronic power assisted steering system to car function safety spare has designed a power source filter circuit, can guarantee through this power source filter circuit that steering system's controller is not influenced in whole car electromagnetic interference's environment, and normal work guarantees simultaneously that the controller reaches the limit value of regulation to the electromagnetic interference of outside transmission.

Claims

1. The utility model provides a power interface filter circuit of electronic power assisted steering system controller which characterized in that: the connection is carried out as follows: the VBAT port is divided into nine paths, which are respectively connected to one end of a capacitor C1, one end of a capacitor C2, one end of a capacitor C3, one end of a capacitor C4, one end of a capacitor C5, one end of a capacitor C6, one end of a capacitor C7, one end of a capacitor C8, and one end of an inductor L1, the other end of a capacitor C1 is divided into four paths, which are respectively connected to HGND, one end of a capacitor C14, the other end of a capacitor C2, and one end of a capacitor C15, the other end of a capacitor C14 is merged with the other end of a capacitor C15 and then grounded, the other end of a capacitor C3 is divided into ten paths, which are respectively connected to ground, the other end of a capacitor C3, one end of a capacitor C3, and the other end of a capacitor L3, which are respectively connected to six paths of, The other end of the capacitor C10, one end of the capacitor C11, one end of the capacitor C12, one end of the capacitor C13 and a VBAT1 port are connected, the other end of the capacitor C16 is connected with the HGND1, the other end of the capacitor C17 is connected with the HGND2, the other end of the capacitor C18 is connected with the HGND3, and the other end of the capacitor C11, the other end of the capacitor C12 and the other end of the capacitor C13 are grounded after being gathered.

2. The power interface filter circuit of an electric power steering system controller according to claim 1, wherein: the HGND, the HGND1, the HGND2 and the HGND3 are screw holes on the metal shell.