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7622873 |
Motor drive device and drive method
A reverse current detection unit detects the direction of the motor current during the synchronous rectifier period based on the polarity of the on voltage of a switching device contained in the...
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7616459 |
System and method for a primary feedback switched mode power supply
A primary side controlled power converter having a voltage sensing means coupled to a transformer of the power converter and configured to provide a voltage feedback waveform representative of an...
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7605546 |
Discharge lamp lighting apparatus and semiconductor integrated circuit
A discharge lamp lighting apparatus includes a triangular signal oscillator, a first control part to compare the triangular signal with an error voltage between a reference voltage and a voltage...
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7599201 |
Method of controlling the duty of a PWM signal, PWM signal generating circuit, and image forming apparatus using same
A PWM signal generating circuit that generates a PWM signal having a period controlling portion for slightly fluctuating a period of the PWM signal; and a duty controlling portion for changing a...
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7596006 |
Reducing output ripple from a switched mode power converter
The present invention pertains to a switching regulator having two inductors that discharge stored energy during the switching operation to an output capacitor, which integrates the pulses and...
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7593500 |
Apparatus for coordinating triggering of analog-to-digital conversions relative to pulse width modulation cycle timing
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7589984 |
Method for starting pulse width modulation
A method for starting the modulation of a frequency converter, which method comprises the steps of receiving reference voltages (s a , s b , s c ; U ref ), generating output switch commands from...
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7577007 |
Power converting apparatus
A power converting apparatus used as an active filter includes single-phase multiplex inverter unit for converting DC power into AC power and a control unit for controlling the single-phase...
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7567445 |
Switch mode power supply controllers
This invention relates to SMPS controllers employing primary side sensing. We describe a system for identifying a knee point in a sensing waveform, at which the output voltage of the SMPS may be...
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7561451 |
Power converter apparatus and methods using a phase reference derived from a DC bus voltage
In a power converter apparatus, such as an uninterruptible power supply, a phase reference signal is generated responsive to a DC voltage on a DC bus. A magnitude reference signal may be generated...
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7560917 |
Current feed-through adaptive voltage position control for a voltage regulator
In a voltage regulator including an error amplifier to generate a first signal related to an output voltage of the voltage regulator, a current sense circuit to generate a second signal related to...
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7558088 |
Power supply device
A power supply device comprises: a voltage converting portion that converts a voltage generated from a power supply portion into an output voltage to be supplied to a load; a voltage divider...
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7557555 |
Method to determine an operating characteristic of a vehicle power converter
Measured or otherwise known operating characteristics of a DC/DC power converter are used to determine, without measuring, an operating characteristic of the DC/DC power converter.
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7551460 |
Switch mode power supply controllers
This invention relates to switch mode power supply (SMPS) controllers employing primary side sensing. We describe an (SMPS) controller which uses an area correlator to compare an area under a...
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7548443 |
Three-phase PWM-signal generating apparatus
An apparatus for generating a three-phase pulse-width-modulation signal for a three-phase voltage inverter employing a semiconductor switching element includes a generating unit that generates the...
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7548439 |
Electric power converter for reducing generated high frequency components
By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat...
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7542312 |
Electric power converter
By reduction in loss and noise of a three-phase reactor on the AC side of an electric power converter, compactness and reduction in weight of the reactor are realized, and countermeasures for heat...
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7521910 |
Method and device for measuring current in a switched current path of a circuit
A method and device for measuring a switched current (I H ) comprises: sensing the switched current (I H ) with an AC current transformer to obtain an intermediate measuring signal (V HM );...
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7518891 |
Auxiliary circuit for use with three-phase drive with current source inverter powering a single-phase load
An auxiliary circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage...
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7508901 |
Apparatus and method for generating current reset mode pulse width modulation signals
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7508900 |
Apparatus for improved resolution pulse width modulation module duty cycle, dead time and phase
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7508899 |
Apparatus and method for generating multi-phase pulse width modulation (PWM) and sharing a common (master) duty cycle value among a plurality of PWM generators
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7505702 |
High power supply to control an abnormal load
A high power supply to control an abnormal load includes a high voltage power processor to amplify a supplied DC power and to output the amplified DC power, a trans/rectifier to transform the DC...
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7505293 |
Device and method for controlling electric power converter
The control device of an electric power converter comprises a control device controlling turn-on of semi-conductor legs. The converter comprises DC voltage power supply lines on three levels with...
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7505292 |
Device and method for controlling an electric power converter
The control device of an electric power converter comprises a control device controlling turn-on of semi-conductor legs. The converter comprises DC voltage supply lines, an inverter connected...
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7502436 |
Apparatus and method for generating push-pull pulse width modulation signals
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7502235 |
Output power limit for a switching mode power converter by a current limit signal having a multi-slope waveform
A current limit signal having a multi-slope waveform is provided for a power converter that has a power switch switched to convert an input voltage to an output voltage, for output power control...
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7499296 |
Electric power converter device with control means and process and converting power
An electric power converter with a control device that comprises a processing unit receives control signals and sends modulated signals to inverter stages of the electric power converter. The...
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7495399 |
Power output apparatus and vehicle including the same
A coordination control device of a power output apparatus includes a coordination control unit. The coordination control unit calculates an intermediate value between the maximum value and minimum...
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7492619 |
System and method for providing control for switch-mode power supply
System and method for providing control for switch-mode power supply. According to an embodiment, the present invention provides a system for regulating a power converter. The system comprises a...
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7486030 |
Universal input voltage device
A universal input voltage device is presented which may receive a wide range of regulated and unregulated input voltages, both DC and a wide range of variable frequency AC, and output a desired...
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7483279 |
Apparatus and method for detecting phase currents of inverter
The present invention previously sets a threshold voltage, compares the set threshold voltage with a reference voltage, and judges whether a minimal pulse width of a PWM signal is obtained. When a...
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7480161 |
Control apparatus for semiconductor power converter
A control apparatus for controlling a three- or single-phase semiconductor power converter employing fixed-pulse switching patterns superposes a DC component on an AC output voltage, to suppress...
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7471532 |
Electric circuit, in particular for a medium-voltage power converter
Disclosed is an electric circuit, in particular for a medium voltage power converter. The circuit has at least four semiconductor switches which form a series connection and which are connected to...
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7471526 |
Method and apparatus to reduce PWM voltage distortion in electric drives
Methods and apparatus are provided for reducing voltage distortion effects at low speed operation in electric drives. The method comprises receiving a first signal having a duty cycle with a range...
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7453246 |
Adaptive PWM pulse positioning for fast transient response
An adaptive pulse positioning system for a voltage converter providing an output voltage, the system including a PWM generation circuit, a sensor, and a pulse positioning circuit. The PWM...
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7446435 |
Power converter system and method
A power system for providing an output power to a load is provided. The system comprises a generator configured to generate an alternating current input power and an power converter system coupled...
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7433404 |
Apparatus for higher resolution pulse width modulation duty cycle
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7433216 |
Voltage control and harmonic minimization of multi-level converter
A controller applies a pattern of pulses to switching elements within a multi-level controller to effectuate control of the fundamental voltage magnitude and phase associated with the converter, as...
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7426123 |
Finite state machine digital pulse width modulator for a digitally controlled power supply
A method is disclosed for generating pulse width modulated pulse control signals for controlling switches in a switching power supply. First, a count value is determined of a master clock within a...
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7426122 |
Power-converter control apparatus employing pulse width modulation and adjusting duration of a zero-voltage vector
An apparatus for controlling a power converter including a voltage-vector control unit that determines, based on voltage instruction value for the power converter, a voltage vector output from a...
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7423494 |
Apparatus and method for a spread-spectrum oscillator for magnetic switched power converters
A method and apparatus for a spread-spectrum oscillator for a switched power converter is provided. The spread-spectrum oscillator includes a current waveform generation circuit, a capacitor, a...
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7421301 |
Speed-variable maximum delay clamping when using variable-delay random PWM switching
A control system and a method of using the same for an electric machine having a random number generating module generating a random number ranging from a first value to a second value, a...
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7420824 |
Method of designing an RPWM inverter with unwanted harmonic elimination
A method of designing a random pulse width modulation (RPWM) inverter with unwanted harmonic elimination, which first uses a Fourier analysis and a numerical analysis to eliminate the unwanted...
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7400518 |
Modulation methods and apparatus for reducing common mode noise
A method and apparatus for reducing common mode noise in a three phase pulse width modulated (PWM) system the method comprising the steps of receiving modulating waveforms, identifying a first of...
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7397675 |
Inverter-filter non-linearity blanking time and zero current clamping compensation system and method
Inverter-filter non-linearity blanking time and zero current clamping compensation is accomplished by comparing the average output current with the discontinuous current mode threshold values to...
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7391628 |
Switching controller having frequency hopping for power supplies and method therefor
A switching controller having frequency hopping is used for reducing the EMI of a power supply. A pattern generator generates a digital pattern code in response to a clock signal. An oscillator...
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7382112 |
Methods and devices for input waveform control in switching power supplies
The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific,...
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7376182 |
Digital processor with pulse width modulation module having dynamically adjustable phase offset capability, high speed operation and simultaneous update of multiple pulse width modulation duty cycle registers
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM,...
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7352598 |
Inverter units with duty cycle control based on the detected, high and low output voltage
An inverter unit includes a DC power source, an inverter circuit having two or more pairs of switching elements which are connected in parallel to the DC power source, so that a DC voltage of the...
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