| Patent Number |
Title Of Patent |
Date Issued |
| RE33519 |
Method and apparatus for controlling induction motor |
January 15, 1991 |
| When actuating again in induction motor rotating inertially by applying power to the induction motor from an inverter capable of changing both of its output frequency and output voltage, the power is once supplied to the induction motor to increase the residual voltage if the residual vo |
| 7394668 |
Switching power supply circuit and frequency converter |
July 1, 2008 |
| An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive switching power suppl |
| 7272004 |
Frequency converter |
September 18, 2007 |
| A frequency converter includes a circuit substrate, a housing that covers at least the circuit substrate, a radiating section in which gases at an intake face are exhausted from an exhaust face so as to radiate heat, a fan provided on the exhaust face of the radiating section, and a guid |
| 7206204 |
Electric circuit module |
April 17, 2007 |
| An electric circuit module comprising: an electric device comprising an electric circuit to serve for passage and interruption of electric current, a packing material packing the electric circuit and a plurality of wiring members to electrically connect the electric circuit with an e |
| 7151680 |
Switching power supply circuit and frequency converter |
December 19, 2006 |
| An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the receiving voltage is high and thereby provide a small and inexpensive switching power suppl |
| 7054157 |
Frequency converter |
May 30, 2006 |
| Measures are provided to prevent temperature rise caused by that heat generated from power elements, which is radiated inside a housing.In a housing comprising a radiating section and a cooling fan, a guide is provided on a part of the housing to be made longer a predetermined value |
| 6960980 |
Power converter with shunt resistor |
November 1, 2005 |
| A power converter includes a shunt resistor constituted by a shunt resistance and a plurality of main electrodes made of a sheet-like resistive material. In the shunt resistor, plates lower in volume electric resistivity than the resistive material, higher in thermal conductivity tha |
| 6927665 |
Power converter |
August 9, 2005 |
| A low noise, compact and low cost electric power converter employing a compact common mode transformer, and incorporating a line filter can reduce a leakage current, and can maintain predetermined leakage current reduction effect even if installation condition of the electric power c |
| 6873240 |
Power converter |
March 29, 2005 |
| A low noise, compact and low cost electric power converter employing a compact common mode transformer, and incorporating a line filter can reduce a leakage current, and can maintain predetermined leakage current reduction effect even if installation condition of the electric power c |
| 6794854 |
Vehicle power converted with shunt resistor having plate-shape resistive member |
September 21, 2004 |
| A power converter includes a shunt resistor constituted by a shunt resistance and a plurality of main electrodes made of a sheet-like resistive material. In the shunt resistor, plates lower in volume electric resistivity than the resistive material, higher in thermal conductivity tha |
| 5465202 |
Inverter apparatus provided with electric discharge control circuit of dc smoothing capacitor an |
November 7, 1995 |
| In a variable frequency power source unit, a series circuit of a contactless semiconductor switching element and a resistor is provided in parallel to a d.c. smoothing capacitor, and a control circuit is provided for receiving a signal for turning on the switching element selectively at |
| 5210479 |
Drive circuit for an insulated gate transistor having overcurrent detecting and adjusting circui |
May 11, 1993 |
| An ON holding circuit is provided which outputs a signal which identifies an ON state of an insulated gate transistor to a gate voltage input circuit, and inhibits the gate voltage input circuit from being responsive to an input signal which identifies an OFF state of the insulated gate |
| 5177678 |
Inverter apparatus for preventing an overincrease of output frequency |
January 5, 1993 |
| An inverter apparatus using a microcomputer control system suitable for use in driving an ac rotary electric machine is concerned. The inverter apparatus includes a device for detecting an output current or an output voltage of the inverter apparatus or a control signal supplied to the |
| 5175483 |
Method and an apparatus for computing moment of inertia in a motor speed controller, and a speed |
December 29, 1992 |
| In a motor speed controller for controlling an AC motor to be driven at a variable speed, a signal proportional to a load torque and a signal proportional to an output torque of the AC motor are found by current detecting means for detecting the primary current of the AC motor, and i |
| 5121283 |
Overcurrent protective circuit for electrostatic self-turn-off devices |
June 9, 1992 |
| This specification discloses an overcurrent protective circuit for detecting an overcurrent flowing through an electrostatic self-turn-off device and suppressing the overcurrent.The overcurrent protective circuit according to the present invention comprises a power source for supplying a |
| 5091823 |
Inverter device |
February 25, 1992 |
| In an inverter device comprising a main circuit section which switches a power at high speed, having a switching element and a smoothing condenser for smoothing the power supplied to the switching element, and a logic section for controlling the main circuit section, a shielding member i |
| 4779183 |
Method and apparatus for selectively controlling an operation mode of a PWM inverter between an |
October 18, 1988 |
| A method and apparatus are disclosed for controlling a pulse width modulated (PWM) inverter controlled for ignition by a (PWM) pulse produced with a carrier wave and a modulation wave. The method comprises sampling an amplitude of the modulation wave at a cycle rate related to the fr |
| 4767976 |
Control system for PWM inverter |
August 30, 1988 |
| A control system for controlling a PWM inverter so that the inverter drives an induction motor at a variable voltage and a variable frequency while keeping constant a ratio of the output voltage of the inverter to the output frequency thereof, is disclosed which includes current componen |
| 4689542 |
Method and apparatus for controlling induction motor |
August 25, 1987 |
| When actuating again an induction motor rotating inertially by applying power to the induction motor from an inverter capable of changing both of its output frequency and output voltage, the power is once supplied to the induction motor to increase the residual voltage if the residual vo |
| 4516065 |
Control apparatus for AC motors |
May 7, 1985 |
| When driving an AC motor with a PWM inverter, the width of a speed command signal is modulated by a carrier to produce width modulated pulses for controlling main switching elements. The width modulated pulses are liable to be attended with impulses which cause magnetic vibrations in the |
| 4451771 |
Apparatus for controlling AC motor |
May 29, 1984 |
| Disclosed is a control apparatus for an AC motor which is driven by a power converter constituted by switching elements. A current control circuit turns on/off the switching elements in accordance with a current pattern signal in the form of an AC signal to thereby control the motor curr |
