Electronic control device
To provide an electronic control device capable of suppressing leakage of radio-frequency radiation noise, radiated from a noise source, to the outside. The electronic control device includes a radio-frequency circuit 104 at least a part of which is driven at a radio frequency, a printed circuit board 101 on which a low-frequency circuit 103 that is driven at a low frequency is mounted, a housing 100 made of metal that includes therein the printed circuit board 101 together with the radio-frequency circuit 104 and the low-frequency circuit 103 , a plurality of radio-frequency connectors 106 a to 106 f for transmitting and receiving signals related to the radio-frequency circuit 104 mounted on the printed circuit board 101 to and from the outside of the housing, a low-frequency connector 105 for transmitting and receiving signals related to the low-frequency circuit 103 mounted on the printed circuit board 101 to and from the outside of the housing, and a partition wall 203 for suppressing propagation of radiation noise, radiated by driving the radio-frequency circuit 104 , to the low-frequency connector 105.
1. An electronic control device comprising:
a board on which a radio-frequency electronic component that operates at a predetermined frequency or higher is mounted;
a housing made of metal, the housing internally including the board;
a high-speed communication connector for connecting to outside, the high-speed communication connector being mounted on the board; and
a low-speed communication connector for connecting to the outside, the low-speed communication connector being mounted on the board and having a communication speed lower than the communication speed of the high-speed communication connector,
wherein the housing includes a partition wall provided between the radio-frequency electronic component and the low-speed communication connector.
2. The electronic control device according to claim 1 , wherein
a low-frequency electronic component that operates at a frequency lower than a predetermined frequency is mounted on the board,
the low-frequency electronic component and the radio-frequency electronic component are mounted on the board in such a manner that the board is divided into a low-frequency region in which the low-frequency electronic component is mounted and a radio-frequency region in which the radio-frequency electronic component is mounted, and
the partition wall is provided between the low-frequency region and the radio-frequency region.
3. The electronic control device according to claim 2 , wherein
the housing includes a metal base and a metal cover, and
the partition wall is electrically DC-coupled to the metal base and the metal cover.
4. The electronic control device according to claim 3 , wherein
the partition wall is formed integrally with the metal base,
the partition wall and the metal cover are connected to each other with a metal screw, and
a screw hole for allowing the metal screw to pass through is formed in the board.
5. The electronic control device according to claim 4 , wherein
λ/4>L is satisfied, where L represents, among distances from the screw hole to side surfaces of the housing, a longer distance of distances along the partition wall, and λ represents a wavelength of radiation noise radiated by driving of the radio-frequency electronic component.
6. The electronic control device according to claim 5 , wherein
the board includes a signal ground and a frame ground, and
the screw hole is a screw hole formed in the frame ground.
7. The electronic control device according to claim 4 , wherein
the partition wall and the metal cover are connected to each other with a plurality of metal screws, and
a plurality of screw holes for allowing the plurality of the metal screws to pass through are formed in the board.
8. The electronic control device according to claim 7 , wherein
λ/4>L 2 is satisfied, where L 2 represents an interval between the screw holes, and λ represents a wavelength of radiation noise radiated by driving of the radio-frequency electronic component.
9. The electronic control device according to claim 2 , wherein
the housing includes a metal base and a metal cover, and
the partition wall is electrically AC-coupled to the metal base and the metal cover.
10. The electronic control device according to claim 9 , further comprising:
a first dielectric material provided between the partition wall and the board; and
a second dielectric material provided between the board and the metal cover.