Abstract: The control circuit for a system provided with a power converter of multi-phase rotating electric machine, and is provided with a switch driving unit that drives the upper and lower arm switches based on the switching command to drive the rotating electric machine, an emergency power source that generates power with a power supplied from the power storage unit, an abnormality determination unit that determines whether a failure occurs in the control circuit, and an emergency control unit that performs, when the emergency determination unit determines that a failure occurs in the control circuit, a short circuit control in which either the upper arm switches or the lower arm switches are turned ON and the other arm switches are turned OFF by using the emergency power generated by the emergency power source.

Abstract: A control circuit is applied to a system provided with a rotary electric machine, a power converter electrically connected to a winding of the rotary electric machine, a power source, a cutoff switch provided on an electrical path that connects the power source and the power converter, and a storage unit. The control circuit is provided with a failure determination unit that determines whether a failure occurs in the system and a regeneration prevention unit that prevents a power regeneration, where a current flows from a rotary electric machine side towards a storage unit side, from occurring. In the case where the failure determination unit determines that a failure occurs in the system, the cutoff switch is turned OFF after the regeneration prevention unit prevents an occurrence of the power regeneration.

Abstract: A control circuit of a power conversion apparatus is provided with a switch driving unit that drives the upper and lower arm switches; a short circuit control unit that causes the switch driving unit to execute a short circuit control when a failure occurs in the system, the short circuit control turning an ON side switch to an ON state and turning an OFF side switch to an OFF state; a checking unit that executes a checking process to check whether the short circuit control is able to perform correctly; and a protection control unit that causes the switch driving unit to execute a protection control when a failure occurs on either the upper arm switch or the lower arm switch, the protection control turning the switch where the failure occurs to an OFF state. The control circuit enables the protection control during execution of the checking process.

Abstract: A control circuit for a power converter is applicable to a system that includes a power supply, a power converter, an interruption switch, a smoothing capacitor, and a series-connection body made of a discharge resistor and a discharge switch. In the control circuit, a discharge command unit outputs a discharge command for the smoothing capacitor. A discharge drive command unit outputs a drive command for the discharge switch based on the discharge command outputted from the discharge command unit. A drive circuit is connected to a gate of the discharge switch and performs drive control of the discharge switch based on the drive command outputted from the discharge drive command unit. An operation detecting unit detects a signal related to driving of the drive switch. A discharge determining unit determines whether the discharge drive command unit is normal based on a detected signal of the operation detecting unit.

Abstract: The control circuit for a system provided with a power converter of multi-phase rotating electric machine, and is provided with a switch driving unit that drives the upper and lower arm switches based on the switching command to drive the rotating electric machine, an emergency power source that generates power with a power supplied from the power storage unit, an abnormality determination unit that determines whether a failure occurs in the control circuit, and an emergency control unit that performs, when the emergency determination unit determines that a failure occurs in the control circuit, a short circuit control in which either the upper arm switches or the lower arm switches are turned ON and the other arm switches are turned OFF by using the emergency power generated by the emergency power source.

Abstract: A control circuit is used for a system including a power storage unit, an electric load, and a power converter electrically connected to the electric load. The control circuit includes an abnormality determination unit, an emergency power supply that generates power based on electricity supplied from the power storage unit, and a protective control unit that, when the abnormality determination unit determines that an abnormality has occurred, performs protective control for the system. The emergency power supply includes a power supply control unit configured to be operable based on electricity supplied from the power storage unit. During the period from when the voltage input to the power supply control unit starts increasing based on electricity supplied from the power storage unit, the power supply control unit starts the emergency power supply in response to the input voltage reaching a specified voltage.

Abstract: In a control circuit for a power converter applicable to a system including a rotary electric machine, a fail-safe controller performs, in response to determination that there is a failure in the system, a short-circuit control routine that turns on predetermined turn-on arm switches, and turns off predetermined turn-off arm switches. The turn-on arm switches bare one of (i) upper-arm switches and (ii) lower-arm switches, and the turn-off arm switches are the other of (i) the upper-arm switches and (ii) the lower-arm switches. An on determiner detects a drive state of each turn-on arm switch upon determination that the turn-on is instructed for the corresponding turn-on arm switch, and determines, based on the drive state of each turn-on arm switch, whether the turn-on arm switches are switchable to be on in preparation for a short-circuit control routine performed by a short-circuit controller.