Redundant circuit device

1. A redundant circuit device including a first system circuit and a second system circuit having identical function to make the function be redundant, the redundant circuit device comprising:

a substrate that is partitioned into a first region in which at least a part of the first system circuit is provided and a second region in which at least a part of the second system circuit is provided, and has one surface, each of the first region and the second region having a printed wiring;

a first mount component that is included in the first system circuit, has three or more pins, and is surface-mounted on the one surface of the substrate; and

a second mount component that is included in the second system circuit, has an identical number of pins as that of the first mount component and having an identical function as that of the first mount component, and is surface-mounted on the one surface of the substrate,

wherein:

a placement of numbers assigned by function to the respective pins of the first mount component with respect to a center point of the first mount component is defined as a first pin placement;

a placement of numbers assigned by function to the respective pins of the second mount component with respect to a center point of the second mount component is defined as a second pin placement; and

the second pin placement is a mirror inversion of the first pin placement.

2. The redundant circuit device according to claim 1 , wherein:

the pins of the first mount component include a first reference pin, which has a predetermined function;

the pins of the second mount component include a second reference pin, which has the predetermined function;

a direction of the first mount component on the substrate, which is specified by a position of the first reference pin around a center of the first mount component, is defined as a first mounting direction;

a direction of the second mount component on the substrate, which is specified by a position of the second reference pin around a center of the second mount component, is defined as a second mounting direction; and

the second mounting direction coincides with a mirror-inverted direction of the first mounting direction.

3. The redundant circuit device according to claim 1 , wherein:

a boundary line between the first region and the second region is a straight line; and

from a direction perpendicular to a plate surface of the substrate, the center point of the second mount component is located at a position obtained by inverting the center point of the first mount component with respect to the boundary line as a symmetry axis.

4. The redundant circuit device according to claim 1 , wherein:

the first system circuit and the second system circuit control electric power to a motor having a rotation shaft;

each of the first system circuit and the second system circuit includes a power conversion circuit that converts a supplied electric power to output the converted electric power to the motor; and

each of the first system circuit and the second system circuit includes a control circuit that controls operation of the power conversion circuit.

5. The redundant circuit device according to claim 4 , further comprising:

a sensor element that is mounted on the one surface of the substrate, and detects a rotation angle of the rotation shaft,

wherein:

at least a part of the sensor element is positioned on a boundary line between the first region and the second region.

6. The redundant circuit device according to claim 4 , wherein:

the power conversion circuit includes a power wiring pattern;

the control circuit includes a control wiring pattern; and

the printed wiring provided on the substrate includes both the power wiring pattern and the control wiring pattern.

7. The redundant circuit device according to claim 4 , wherein:

each of the first mount component and the second mount component includes an integrated circuit component included in the control circuit.

8. The redundant circuit device according to claim 4 , wherein:

each of the first mount component and the second mount component includes a switching element included in the power conversion circuit.

9. A redundant circuit device including a first system circuit and a second system circuit having identical function to make the function be redundant, the redundant circuit device comprising:

a substrate that is partitioned into a first region in which at least a part of the first system circuit is provided and a second region in which at least a part of the second system circuit is provided, and has one surface, each of the first region and the second region having a printed wiring;

a first mount component that is included in the first system circuit, has three or more pins, and is surface-mounted on the one surface of the substrate; and

a second mount component that is included in the second system circuit, has an identical number of pins as that of the first mount component and having an identical function as that of the first mount component, and is surface-mounted on the one surface of the substrate,

wherein:

a placement of numbers assigned by function to the respective pins included in the first mount component with respect to a center point of the first mount component is defined as a first pin placement;

a placement of numbers assigned by function to the respective pins included in the second mount component with respect to a center point of the second mount component is defined as a second pin placement;

the first pin placement is identical with the second pin placement;

the pins included in the first mount component has a first reference pin, which has a predetermined function;

the pins included in the second mount component has a second reference pin, which has the predetermined function;

a direction of the first mount component on the substrate, which is specified by a position of the first reference pin around a center of the first mount component, is defined as a first mounting direction;

a direction of the second mount component on the substrate, which is specified by a position of the second reference pin around a center of the second mount component, is defined as a second mounting direction; and

the first mounting direction and the second mounting direction are different from each other.

10. The redundant circuit device according to claim 9 , wherein:

a boundary line between the first region and the second region is a straight line; and

from a direction perpendicular to a plate surface of the substrate, the center point of the second mount component is located at a position obtained by inverting the center point of the first mount component with respect to the boundary line as a symmetry axis.

11. The redundant circuit device according to claim 9 , wherein:

the first system circuit and the second system circuit control electric power to a motor having a rotation shaft;

each of the first system circuit and the second system circuit includes a power conversion circuit that converts a supplied electric power to output the converted electric power to the motor; and

each of the first system circuit and the second system circuit includes a control circuit that controls operation of the power conversion circuit.

12. The redundant circuit device according to claim 11 , further comprising:

a sensor element that is mounted on the one surface of the substrate, and detects a rotation angle of the rotation shaft,

wherein:

at least a part of the sensor element is positioned on a boundary line between the first region and the second region.