Power conversion device, electric power steering system, electric vehicle, electronic control throttle, and electric brake

A power conversion device configured to convert power supplied from a power source into a driving current of a motor by using a plurality of semiconductor switching elements, the driving current to be supplied from phase output,

• wherein a first semiconductor switching element of the plurality of semiconductor switching elements is disposed between the phase output of the power conversion device and the power source, and a first diode is connected in parallel to the first semiconductor switching element,
• a second semiconductor switching element of the plurality of semiconductor switching elements is disposed between the phase output of the power conversion device and a ground, and a second diode is connected in parallel to the second semiconductor switching element,
• a third semiconductor switching element of the plurality of semiconductor switching elements is disposed between a winding of the motor and the power source, and a third diode is connected in parallel to the third semiconductor switching element,
• a fourth semiconductor switching element of the plurality of semiconductor switching elements is disposed between the winding of the motor and the ground, and a fourth diode is connected in parallel to the fourth semiconductor switching element,
• the third diode is configured to allow current flow from the power source to the motor,
• the fourth diode is configured to allow current flow from the motor to the ground,
• one of the third semiconductor switching element and the fourth semiconductor switching element is connected in series with the winding of the motor,
• the other of the third semiconductor switching element and the fourth semiconductor switching element is connected between the first semiconductor switching element and the power source or between the second semiconductor switching element and the ground,
• the phase output includes at least four pieces of phase output,
• either (i) each of the at least four pieces of phase output is connected to a motor having at least four phases, or (ii) each of at least three of the at least four pieces of phase output is connected to a motor having at least three phases, and one of the at least four pieces of phase output is connected to a neutral point of the motor including at least three phases.

A power conversion device configured to convert power supplied from a power source into a driving current of a motor by using a plurality of semiconductor switching elements, the driving current to be supplied from phase output,

• wherein a first semiconductor switching element of the plurality of semiconductor switching elements is disposed between the phase output of the power conversion device and the power source, and a first diode is connected in parallel to the first semiconductor switching element,
• a second semiconductor switching element of the plurality of semiconductor switching element is disposed between the phase output of the power conversion device and a ground, and a second diode is connected in parallel to the second semiconductor switching element,
• the first diode and the second diode parallel with the second semiconductor switching element are connected in an inverse direction, one of the first and second diodes configured to allow current flow between a winding of the motor and the power source, and the other of the first and second diodes configured to allow current flow between the winding of the motor and the ground,
• the phase output includes at least four pieces of phase output,
• either (i) each of the at least four pieces of phase output is connected to a motor having at least four phases, or (ii) each of at least three of the at least four pieces of phase output is connected to a motor having at least three phases, and one of the at least four pieces of phase output is connected to a neutral point of the motor including at least three phases.