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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Umemoto; Kiyotaka
Address:
Kyoto, JP
No. of patents:
22
Patents:












Patent Number Title Of Patent Date Issued
8111051 Step-down switching regulator February 7, 2012
An output monitoring comparator outputs an ON signal when an output voltage becomes lower than a reference voltage. A pulse modulator generates a pulse signal at a predetermined level, an ON time-period from when the ON signal is outputted. A driver circuit alternately turns ON, afte
8072201 Power supply apparatus December 6, 2011
In a power supply apparatus that is so configured as to produce from an input voltage an output voltage Vo within a predetermined permissible variation range, the output voltage Vo is so controlled as to decrease within the permissible variation range as the output current Io increas
7663355 Power supply apparatus February 16, 2010
In a power supply apparatus that is so configured as to produce from an input voltage an output voltage Vo within a predetermined permissible variation range, the output voltage Vo is so controlled as to decrease within the permissible variation range as the output current Io increas
7612545 DC/DC converter November 3, 2009
A DC/DC converter includes a switching element which is opened and closed to supply power from an input power supply V.sub.cc through a coil to an output terminal, which is connected to a load, and to adjust the voltage at the output terminal. The DC/DC converter also includes a coil cur
7595620 Switching regulator September 29, 2009
A control signal generating circuit (1) comprises a comparator (10) for comparing an output voltage V.sub.O with a reference voltage outputted from a reference voltage source (11), a flipflop (12) set by the output of the comparator (10), and a pulse control circuit (13) which receives
7486061 Power supply apparatus February 3, 2009
In a power supply apparatus that is so configured as to produce from an input voltage an output voltage Vo within a predetermined permissible variation range, the output voltage Vo is so controlled as to decrease within the permissible variation range as the output current Io increas
7202652 Motor driving apparatus incorporating switch device driving apparatus April 10, 2007
A motor driving apparatus which includes a pair of field-effect transistors connected in series between a first supply voltage and a second supply voltage lower than the first supply voltage, an output smoothing circuit connected to a node between the two field-effect transistors, a
7148667 Power supply apparatus December 12, 2006
In a power supply apparatus that is so configured as to produce from an input voltage an output voltage Vo within a predetermined permissible variation range, the output voltage Vo is so controlled as to decrease within the permissible variation range as the output current Io increas
7095219 Electric power supply unit having improved output voltage response August 22, 2006
The power supply unit is provided with a power supply circuit adapted to generate an output voltage in accord with an instruction voltage, an output condenser Co connected to the output end of the power supply circuit, and an auxiliary output voltage setting circuit adapted to compar
7061735 Semiconductor device June 13, 2006
A semiconductor device has an electrostatic protection diode in a signal input portion thereof and is accompanied by a parasitic transistor between the diode and an output control transistor. The semiconductor device further has a dummy transistor that is formed closer than the outpu
7046533 DC/DC converter May 16, 2006
In a DC/DC converter having a plurality of DC/DC converters, to prevent faults in the circuit and the circuit elements constituting it even when the balance of current limiting operation among the individual DC/DC converters is disturbed due to individual and temperature-related vari
7045915 Power supply unit having multiple power supply outputs May 16, 2006
A power supply unit (system power supply IC) has a multiplicity of power supply circuits providing for different supply voltages. Should an abnormal condition take place in any of the multiple power supply circuits, the power supply circuit suffering the abnormality issues an abnorma
6954055 Switching device driving apparatus and DC/DC converter incorporating the same October 11, 2005
A switching device driving apparatus has a driver for controlling, according to an input signal, the on/off states of a pair of field-effect transistors connected in series between a first supply voltage and a second supply voltage lower than the first supply voltage, and a detector
6949917 Switching power supply unit September 27, 2005
A switching power supply unit generates a pulse signal having a duty factor based on the voltage associated with the difference between a reference voltage and the output voltage of the unit, and the voltage associated with the current flowing through a smoothing coil. Upon receipt of th
6922042 DC/DC converter July 26, 2005
A DC/DC converter produces from an input voltage a desired output voltage by first finding the error voltage between the output voltage and a first reference voltage and then controlling the output current according to the differential voltage between the error voltage and a second refer
6917189 Electric power supply unit having improved output voltage response July 12, 2005
The power supply unit is provided with a power supply circuit adapted to generate an output voltage in accord with an instruction voltage, an output condenser Co connected to the output end of the power supply circuit, and an auxiliary output voltage setting circuit adapted to compar
6894470 Power supply device and electric appliance employing the same May 17, 2005
A power supply device has a reference voltage generator for generating a reference voltage, a monitor voltage generator for generating a monitor voltage that varies according to an output voltage, an output controller for producing the output voltage from an input voltage in such a way t
6891736 Multiphase DC/DC converter May 10, 2005
In a multiphase DC/DC converter having a plurality of DC/DC converters, to prevent faults in the circuit and the circuit elements constituting it even when the balance of current limiting operation among the individual DC/DC converters is disturbed due to individual and temperature-relat
6815939 Switching power supply unit November 9, 2004
A switching power supply unit generates a pulse signal having a duty factor based on the voltage associated with the difference between a reference voltage and the output voltage of the unit, and the voltage associated with the current flowing through a smoothing coil. Upon receipt of th
6531853 DC-DC converter March 11, 2003
A DC--DC converter supplied with a power from a DC power source having a predetermined power source voltage, for controlling an output voltage of the DC--DC converter such that the output voltage becomes an aimed output voltage, by switching a transistor with a pulse having a predetermin
6448752 Switching regulator September 10, 2002
In the present invention, an amplitude of a triangular wave from a triangular wave generating circuit is controlled depending on a power source voltage and further the current value for charging and discharging a capacitor is also controlled depending on the amplitude in such a manner
6369558 Switching regulator April 9, 2002
A switching regulator includes a series circuit of a resistor, a diode and a speed-up capacitor, connected in parallel to a voltage dividing resistor of a voltage dividing resistor circuit for output voltage detection, which is connected to an output terminal of the switching regulator.










 
 
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