Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Takamasa Asai

Katsuya Tsujimoto

Kenichi Fujie

Takahiro Urakabe

Shogo Matsuoka

Tatsuya Okuda

Hiroyuki Otsuka

Naruki Suetake

Sigetada Gotou

Ryo Ute

Shigetada Mitsubishi Denki KK Gotou

An electric power conversion device includes: a first electric power conversion circuit, a current detection circuit, an electric power conversion circuit of field coil excite use, a control circuit, and detector which detects an induced electromotive force generated in the motor generator. In a case where an over current, is detected by the first electric power conversion circuit, the control circuit turns off a switching of a phase of the first electric power conversion circuit from which an over current s detected and a switching of the electric power conversion circuit of field coil excite use. After the value of an induced electromotive force by the motor generator falls below a predetermined value, the control circuit controls to stop a supply of electric power of all phases by the first electric power conversion circuit.

Electric power conversion device

A power conversion device has an internal power supply switch and a bias power supply switch connected in parallel with the internal power supply switch, wherein, when an output voltage of an internal power supply circuit is greater than a predetermined value when a power supply is started up, the bias power supply switch opens a current path, and when the power supply is stopped, the step-up power supply circuit is stopped based on a stop signal output by the internal power supply circuit and the internal power supply switch closes the current path, and when the output voltage of the internal power supply circuit becomes lower than a predetermined value, the bias power supply switch closes the current path.

Power conversion device

Provided is a power conversion device, including a fault determination unit () for determining, based on phase voltages of a polyphase dynamo-electric machine () detected by phase voltage detection units (), a power, earth, or open fault of armature windings of the polyphase dynamo-electric machine (). The fault determination unit () determines, in a state that all power semiconductor switching elements () are in an off state and no induction voltage is generated in the armature windings of the polyphase dynamo-electric machine (), the power fault when all the phase voltages are substantially equal to an anode potential of a DC power supply (), the earth fault when all the phase voltages are substantially equal to a cathode potential of the DC power supply (), and the open fault when all the phase voltages are not substantially the same potential.

Power conversion device and method for diagnosing failure thereof

The present invention relates to a diagnosis apparatus for a field winding type rotating electric machine. The diagnosis apparatus includes an internal power supply circuit having an open fault determination potential, and determines, on the basis of a measurement result of a voltage value of a circuit that includes the field winding in a fault diagnosis condition, that a disconnection has occurred in the circuit when the measurement result is within an open fault determination voltage range including the open fault determination potential, that a power fault has occurred in the circuit when the measurement result is within a power fault determination voltage range including the positive electrode potential, and that an earth fault has occurred in the circuit when the measurement result is within an earth fault determination voltage range including the negative electrode potential.

Diagnosis apparatus for field winding type rotating electric machine and diagnosis method for field winding type rotating electric machine

The present invention has: a pump capacitor (), which has one end thereof connected to the source power supply (B) side via a diode (), and which has the other end thereof connected to two kinds of voltage sources via switches (); and an output capacitor (), which has one end there of connected to a high-potential terminal of a pump capacitor via a diode (), and the other end thereof connected to a source power supply. A filter circuit configured with a resistor () and a capacitor () is provided between the source power supply and the diode ().

Charge pump circuit

To provide a vehicular AC electric generator provided with a highly reliable electric power conversion unit. A stator of a rotary electric machine is configured to have a plurality of sets of three-phase windings, an electric power conversion unit is configured to have a plurality of sets of three-phase bridge circuits corresponding to the plurality of sets of three-phase windings, each of the three-phase windings of the stator is connected to a DC power supply via the corresponding three-phase bridge circuits of the electric power conversion unit, the plurality of sets of three-phase bridge circuits are controlled to be at different switching timings from each other, and semiconductor switches constituting respective arms in the plurality of sets of three-phase bridge circuits are configured to be one-chip MOSFETs.

Vehicular AC electric generator

The present invention relates to a rush current limiting circuit in which a series circuit consisting of an inductor and a resistor for detecting a current is connected between a power source and a first semiconductor switch, in which there is provided a second semiconductor switch whose inter-output-terminal voltage is controlled by the voltage across the series circuit consisting of the inductor and the resistor for detecting a current, and in which the inter-output-terminal voltage of the second semiconductor switch controls the inter-control-terminal voltage of the first semiconductor switch so as to limit a current to a load; the present invention relates also to an electric power converter including the rush current limiting circuit.

Electric power converter

A current limiting device includes a switching portion, a reflux portion connected to a connection point of the switching portion and an output terminal, and supplying a current to a motor generator while the switching portion is cutting off the current, a current measurement portion that measures the current flowing from the output terminal to the motor generator, and a current control portion that controls the switching portion to switch ON/OFF according to a current value measured by the current measurement portion. When the motor generator is motor-driven using electric power of a condenser, the current control portion limits the current to the motor generator by controlling the switching portion to switch ON/OFF in a case where the measured current value is equal to or exceeds a predetermined current value.

Current limiting device for vehicle

Provided is a power conversion device capable of detecting a short circuit failure and protecting from the same securely. The power conversion device includes: a three-phase bridge type power conversion circuit including a semiconductor switch including a first main terminal, a second main terminal, and a control terminal; a control circuit for controlling an operation of the semiconductor switch; and a voltage detection circuit for monitoring a voltage between DC terminals of the power conversion circuit, in which the control circuit has a protection function of turning off the semiconductor switch if the voltage between the DC terminals of the power conversion circuit, which is detected by the voltage detection circuit, is lower than a predetermined value for a predetermined period of time or longer.

Power conversion device including short circuit detection device

In a bridge type power converter including series connectors of power semiconductor switches having first and second main terminals and a control terminal; plural steps of the series connectors connected in parallel, a gate drive circuit for limiting voltage between the first and second main terminals of the power semiconductor switch to a predetermined value only in turning off the power semiconductor switch is provided between the first main terminal and the control terminal of the power semiconductor switch.

Power converter

In an inverter circuit configured with main circuit switches each having a control terminal and first and second main terminals through which the main current flows, and driving circuits each of which applies the driving voltage to the control terminal of each main circuit switch, and controls the main current in accordance with the voltage between the control terminal and the first main terminal, to switch the main circuit switch, between the main circuit switch and the driving circuit, noise-suppression circuits are provided, each of which is configured so as to detect fluctuations in the voltage between the first and the second main terminals of each main circuit switch, and, in accordance with the amplitude and the frequency of the detected voltage fluctuations, to bring to approximately zero the impedance across the control terminal and the first main terminal of each main circuit switch.

Inverter circuit

An automotive rotary electrical apparatus with less than four switching control elements capable of blocking a field current while preventing breakage of the switching control elements in response to a malfunction in a feeder circuit for a field coil is proposed. First and second switching control elements controlled by first and second control signals, and first and second diode elements are used. The field control circuit switches the first control signal to the on-level signal while keeping the second control signal as the on-level signal, then switches the second control signal to the off-level signal while keeping the first control signal as the on-level signal, and further switches the first control signal to the off-level signal while keeping the second control signal to the off-level signal, when a short-to-power malfunction of the positive terminal or a short-circuit malfunction of the first switching control element occurs in the feeder circuit for the field coil.

Automotive rotary electrical apparatus

The invention provides an apparatus for bi-directional power conversion between a DC circuit and an AC circuit, which inexpensively and simply suppresses generation losses of elements and reduces heat generation, wherein a voltage obtained by dividing the U-phase voltage Vu is compared with a voltage obtained by dividing the voltage vpn of a DC circuit by a comparator CP, and the MOSFET UFETh is turned on at the output timing thereof, and a voltage obtained by dividing the V-phase voltage Vv is compared with a voltage obtained by dividing the voltage Vpn of a DC circuit by a comparator CP, and the MOSFET UFETh is turned off at the output timing thereof.

Growing community of inventors

Tokyo, Japan

Takamasa Asai