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| Number | Title | Issue Date |
| 5818709 | Inverter apparatus An inverter apparatus includes a serial resonance circuit provided at the primary side of a booster transformer, a controlling means for turning on and off the serial resonance circuit with a switching element operating at the timing of phase advanced fro... | 10/06/1998 |
| 5812382 | Electrical device with a transformer whose primary is supplied under the control of a chopper An electrical device for use with a transformer whose primary 2 is supplied under the control of a transistor acting as a high frequency chopper, and from which the secondary delivers a low voltage of continuous shape under control of a first diode 5. In ... | 09/22/1998 |
| 5793621 | Switching power supply for computer-driven displays or the like A power supply system has a switching element to be turned on and off for d.c. to d.c. conversion of a unidirectional supply voltage in synchronism with horizontal synchronizing pulses used for line by line synchronization in a computer display. Since com... | 08/11/1998 |
| 5781423 | Pulse width modulation control system for electric power converter In a pulse width modulation control method and system for an electric power converter, in order to suppress the occurrence of lower order harmonics and fractional order harmonics in a direct current component even in a condition where a carrier frequency ... | 07/14/1998 |
| 5768111 | Converter comprising a piezoelectric transformer and a switching stage of a resonant frequency different from that of the transformer In a DC--DC converter comprising a piezoelectric transformer (25) having an input capacitance between a pair of transformer input teminals and a transformer resonant frequeney, an input switching stage (27) responsive to a DC input signal for supplying a ... | 06/16/1998 |
| 5757634 | Multiparalleling system of voltage source power converters A system of multiparalleling a set of voltage source power converters is provided in which any one of the converters may assume the role of a master or a slave. The system can survive the failure of either the master or any of the slaves. A main controlle... | 05/26/1998 |
| 5757636 | Multi-phase inverters utilizing discontinuous PWM with dead bands A drive circuit for a three-plane load (7) includes an inverter bridge consisting of six bridge switches (T1 to T6), a modulation generator (6) which controls switching of the inverter bridge (4) via a pulse width modulator, in dependence on the inverter ... | 05/26/1998 |
| 5751568 | Power supply apparatus for arc-utilizing equipment A power supply apparatus for arc-utilizing equipment includes a first converter for converting a received AC voltage to a DC voltage. An inverter converts the DC voltage to a high-frequency voltage, which is applied to a voltage-transformer with primary and se... | 05/12/1998 |
| 5747894 | Factory automation connector and work pallet A connector divice which can stably supply electric power and send and receive signals in a contactless way, i.e., without using any electrode contact, and without strict alignment of the device. The connector divice is equipped with a primary-side couple... | 05/05/1998 |
| 5747982 | Multi-chip modules with isolated coupling between modules A silicon-on-silicon dual MCM apparatus comprising a printed circuit board having a voltage isolation boundary contained therein supporting a pair of multi-chip modules on either side of the voltage isolation boundary. The MCMs safely convey signals acros... | 05/05/1998 |
| 5745359 | Variable-input-voltage converter with delay proportional to V in / V out A variable-frequency converters with very wide input voltage tolerance using of variable delays which are proportional to the ratio between the input voltage and the output voltage. This variable delay provides good tolerance for variation in Vin | 04/28/1998 |
| 5745358 | Variable-frequency converter with constant programmed delay A variable-frequency variable-input-voltage switched-mode power converter, in which a voltage minimum on the primary switching transistor IS estimated as a fixed value which is determined by the time constant of the reactances on the primary side of the c... | 04/28/1998 |
| 5742496 | Invertor apparatus for converting a DC voltage to a single-phase AC voltage An inverter apparatus wherein a sine wave AC voltage is produced from an output of a converter circuit which converts an input DC voltage into positive and negative sine half wave voltages of a voltage value corresponding to a width of a driving pulse. Fi... | 04/21/1998 |
| 5737206 | Control system for power conversion system A control system for a power conversion system composed of a plurality of unit converters and a transformer for connecting AC outputs of the converters in series. The control system includes a unit for detecting an AC system voltage at the primary winding... | 04/07/1998 |
| 5729445 | Regulated power supply unit with an electronic transformer A regulated power supply unit with an electronic transformer having an input for a transformer power supply voltage on the primary side, an output for an operating a.c. voltage with a higher-frequency component on the secondary side, and a control device ... | 03/17/1998 |
| 5717583 | Power converter control apparatus for controlling commutation of switching devices under transient conditions A power converter controlling apparatus outputs voltage signals different in phase from phases of commutation voltages of each switching device by 90 degrees to transform the voltage signals and the commutation voltages in conformity with polar coordinate... | 02/10/1998 |
| 5717582 | Selectively controlled electrical power switching system Electrical energy from a DC voltage source is supplied through a power swhing converter under operational control, to an electrical load in accordance with a soft-switching mode implemented by an auxiliary resonant commutated pole inverter. A mode contro... | 02/10/1998 |
| 5708578 | PWM inductive load bridge driver for dynamically mixing four and two quadrant chopping during PWM period off time A bridge for driving one phase of a stepping motor includes a PWM driver control circuit that repeatedly turns on at least one of the driver transistors. A sense voltage is produced that is directly related to the bridge load current. When a driver-contro... | 01/13/1998 |
| 5705920 | Power supply apparatus A power supply apparatus which stabilizes the output by feeding it back is provided which suppresses variations of the output for abrupt variations of the input. The power supply apparatus comprises output sensing means for sensing output current and outp... | 01/06/1998 |
| 5706189 | Method of driving a power converter Disclosed is a method of driving a power converter which can simplify a charging sequence of a charge pump capacitor to reduce the time required to design the device without using a voltage protective circuit and optimum design required to determine the c... | 01/06/1998 |
| 5703770 | Method and apparatus for generating a high voltage A method and apparatus for generating a high voltage by converting input power at a low voltage to output power at a high voltage, by: supplying input power to a low voltage unit to produce a periodic signal having a frequency; supplying the periodic sign... | 12/30/1997 |
| 5701239 | High-voltage direct current transmission installation having a high voltage regulation capability An installation for transmission of electric power by means of high-voltage direct current has two converters (SRI, SRII), each of which is connected to an alternating-voltage network (NI, NII) and which are connected to each other through a dc connection... | 12/23/1997 |
| 5699236 | High-voltage stabilization circuit of a monitor A high-voltage stabilization circuit of a monitor can detect accurately a change of a high voltage of a secondary winding of a high-voltage transformer. The high-voltage stabilization circuit of a monitor including a high-voltage transformer for inputting... | 12/16/1997 |
| 5684685 | High voltage power supply for image transfer and image forming apparatus using the same The invention is to provide an improved high voltage transfer power supply and an image forming apparatus, regardless of resistance connected in series to the transfer roller and impedance change of the transfer roller. The high voltage transfer power sup... | 11/04/1997 |
| 5682302 | Adaptable power converter applying digitized-wave-generation for integrated circuit implementation A power invertor system for converting a direct current (DC) input voltage to an alternate current (AC) output voltage with an output analog wave-shape. The power invertor system includes a digitized sequencing circuit for receiving a sequence of clock si... | 10/28/1997 |
| 5675481 | Drive signal controlled under-voltage lockout circuit A MOSFET driven integrated circuit or other peripheral circuit interfaced to a controller that operates on the primary side of a DC to DC converter having a high input voltage relative to the supply voltage powering both the controller and the MOSFET driv... | 10/07/1997 |
| 5668712 | Circuit for controlling a DCC converter in a power supply circuit for a discharge lamp of a motor vehicle headlight A circuit for controlling a DC/AC converter of a power supply circuit for a motor vehicle headlight discharge lamp, the circuit comprising a primary circuit, voltage-feed means for feeding the primary circuit with voltage, and a secondary circuit coupled ... | 09/16/1997 |
| 5668713 | Inverter control method and inverter control device performing feedback control by suppressing delay In a method of controlling an inverter for adjusting a periodic inverter output waveform to a desired periodic waveform, an error waveform pattern between an inverter output waveform of the present prescribed period and a desired periodic waveform generat... | 09/16/1997 |
| 5668704 | Self-exciting flyback converter A self-exciting flyback converter adapted to stabilize an output voltage to be outputted to an external device by controlling the maximum value of a switching current of a switching transistor with a current flowing through a control transistor, the switc... | 09/16/1997 |
| 5666279 | Voltage resonance inverter circuit for dimable cold cathode tubes An object of the present invention is to provide a voltage resonance inverter circuit capable of performing constantly a zero-voltage switching action in response to a change in the input voltage. For achievement of the above object of the present inventi... | 09/09/1997 |
| 5663875 | Voltage converter for the discharge lamp of a motor vehicle headlight, a power supply circuit, and a headlight including the circuit A converter for powering a discharge lamp of a motor vehicle headlight, the converter comprising a primary circuit and a secondary circuit which includes two branches connected in parallel, each of which is coupled by mutual induction with the primary cir... | 09/02/1997 |
| 5663634 | Startup network for a flyback converter with linear regulation A flyback converter using a commercially available voltage regulator with protection mode includes a bypass resistor between the input and output of the voltage regulator to drain charge from the input stage during powerup thereby preventing the regulator... | 09/02/1997 |
| 5657216 | Method and apparatus for linearizing pulse width modulation in overmodulation region A method and/or apparatus for altering command voltages when a modulation index is greater than unity in order to maintain the linear relationship between the fundamental component of phase voltage and the command voltage in PWM inverter or converter usag... | 08/12/1997 |
| 5654883 | Power control apparatus and method and power generating system using them A power control system for obtaining the maximum electric power from a battery power source. The system functions to vary an output voltage of the battery power source to obtain (m) power values from at least (m) voltage signals from a voltage detector an... | 08/05/1997 |
| 5642274 | Low noise sinusoidal controller for pulse width modulated converters A controller for supplying a switching signal to a switched mode power supply, includes a sinusoidal-like wave generator, and circuitry for selectively shifting a dc level in the sinusoidal-like wave whereby a duty cycle of the sinusoidal-like wave at a p... | 06/24/1997 |
| 5640315 | Switching regulator A switching regulator including: a switching element connected to an input DC signal and operating for turning-on and -off the input DC signal to produce an AC signal such as a rectangular wave signal; a rectifier for rectifying the AC signal thereby gene... | 06/17/1997 |
| 5629844 | High voltage power supply having multiple high voltage generators A high voltage power supply (40) having a plurality of high voltage generators (50a, 50b, . . . 50j) that produce a controlled current in a load (24) having a capacitive component. Each high voltage generator consists of a pulsewidth-modulated (PWM) inver... | 05/13/1997 |
| 5629841 | Low power dc-dc converter The converter is a switch mode converter in which a primary transformer winding (12) is switched by a power switch (Q5). The transformer secondary is wound with a power output winding (14) and a reference winding (29). The power switch (Q5) is operated by... | 05/13/1997 |
| 5615095 | Method and apparatus for protecting an inverter power supply In accordance with the present invention a power supply for providing an ac/dc output to a load is disclosed. The power supply includes a first source of dc power and an inverter that provides an ac output to the load. A second source of dc power is provi... | 03/25/1997 |
| 5596492 | Method and apparatus for de-centralized signal frequency restoration in a distributed UPS system An Uninterruptible Power Supply (UPS) for de-centralized operation in a distributed UPS system is described. The UPS system includes a number of UPS units that do not have communication links between them and therefore operate in a de-centralized manner. ... | 01/21/1997 |
