Multiplexing control device for motors

Abstract

This provides technology for applying a multiplexing control device to motor control. [Solution] The multiplexing control device 210 comprises three controllers C that output analog voltage signals including current command values ​​for the U-phase, V-phase, and W-phase of the motor 300; switches SW1 to SW3 provided for each controller C that switch between connecting and disconnecting the output line; a U-phase intermediate value selection unit 211U that receives the U-phase output value of each switch SW and selects the midpoint of the input U-phase output value; a V-phase intermediate value selection unit 211V that receives the V-phase output value of each switch SW and selects the midpoint of the input V-phase output value; a W-phase intermediate value selection unit 211W that receives the W-phase output value of each switch SW and selects the midpoint of the input W-phase output value; and a PWM output unit 212 that generates and outputs a PWM signal based on the respective midpoint values ​​of the U-phase, V-phase, and W-phase.

Claims

1. Three controllers that output U-phase, V-phase, and W-phase analog voltage signals, including the respective current command values ​​for the U-phase, V-phase, and W-phase of the motor, Each controller is provided with an output line that transmits the U-phase, V-phase, and W-phase analog voltage signals output from each controller, Each controller is provided with a switch for switching between connecting and disconnecting the output line, The output values ​​of the U-phase of each switch are input via the output line, and a U-phase intermediate value selection unit selects the second largest intermediate value from the input U-phase output values. The V-phase output values ​​of each switch are input via the output line, and a V-phase intermediate value selection unit selects the second largest intermediate value from the input V-phase output values. The W-phase output values ​​of each switch are input via the output line, and a W-phase intermediate value selection unit selects the second largest intermediate value from the input W-phase output values. A PWM output unit that generates and outputs a PWM signal based on the respective intermediate values ​​of the U-phase, V-phase, and W-phase, A multiplexing control device equipped with the following features.

2. Each controller, A first status monitoring unit generates a first status signal indicating whether or not one of the other controllers is faulty, based on a comparison between the current command values ​​for the U-phase, V-phase, and W-phase generated by each controller and the output values ​​for the U-phase, V-phase, and W-phase of the switch provided on one of the other controllers. A second status monitoring unit generates a second status signal indicating whether or not the other controller is faulty, based on a comparison between the current command values ​​for the U-phase, V-phase, and W-phase generated by each controller and the output values ​​for the U-phase, V-phase, and W-phase of the switch provided on the other controller. A third state monitoring unit generates a third state signal indicating whether or not its own controller is faulty, based on a comparison of the current command values ​​for the U-phase, V-phase, and W-phase generated by each controller with the selection results of the U-phase intermediate value selection unit, the V-phase intermediate value selection unit, and the W-phase intermediate value selection unit. Includes, The multiplexing control device according to claim 1, wherein each switch disconnects the output line connected to the faulty controller based on the first status signal, the second status signal, and the third status signal output from each controller.

3. Each switch, An OR circuit that outputs a signal indicating that the controller is not faulty if at least one of the input first status signal and the second status signal indicates that the controller is not faulty, and outputs a signal indicating that the controller is faulty otherwise. An AND circuit that outputs a signal indicating a fault in the controller if either the third status signal or the signal output from the OR circuit indicates a fault in the controller, and outputs a signal indicating that there is no fault in the controller otherwise. A latch circuit that blocks the output line when the AND circuit outputs a signal indicating a fault in the controller, The multiplexing control device according to claim 2, including the above.

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