Patent application number | Description | Published |
20080238379 | Pulse frequency to voltage conversion - A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The primary and secondary each include a single winding. An output rectifier circuit is coupled with the secondary of the transformer. A resonant circuit is included in the converter circuit and is coupled with the primary. The resonant circuit includes one or more resonance capacitors that are configured for providing a transformer resonance. The transformer resonance comprises the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer. The reflected voltage signal is reflected from the secondary to the primary. The resonant circuit converts a pulse train to produce a voltage potential, the voltage potential varying in proportion to an output voltage, the pulse train comprising a duty cycle proportional to a load current. A virtual output voltage feedback loop is provided. The converter circuit is responsive to a virtual output voltage reference signal in regulating an output voltage. | 10-02-2008 |
20080238389 | Primary only control quasi resonant convertor - A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The primary and secondary each include a single winding. An output rectifier circuit is coupled with the secondary of the transformer. A resonant circuit is included in the converter circuit and is coupled with the primary. The resonant circuit includes one or more resonance capacitors that are configured for providing a transformer resonance. The transformer resonance comprises the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer. The reflected voltage signal is reflected from the secondary to the primary. A virtual output voltage feedback loop provides an output voltage reference signal to the converter circuit via the resonant circuit. The converter circuit is responsive to the output voltage reference signal in regulating an output voltage. | 10-02-2008 |
20080239760 | Primary only constant voltage/constant current (CVCC) control in quasi resonant convertor - A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The primary and the secondary each comprise a single winding. An output rectifier circuit is coupled with the secondary of the transformer. A resonant circuit is included in the converter circuit and is coupled with the primary. The resonant circuit includes one or more resonance capacitors that are configured for providing a transformer resonance. The transformer resonance comprises the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer. The reflected voltage signal is reflected from the secondary to the primary. A current feedback circuit is coupled between the primary and a controller. A virtual output current feedback loop is provided for regulating an output current using the reflected voltage signal. | 10-02-2008 |
20100061123 | TWO TERMINALS QUASI RESONANT TANK CIRCUIT - A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy source for a transformer resonance. The auxiliary switch effectively exchanges energy between the primary inductance of the transformer and the first and second resonant capacitors. The auxiliary switch effectively switches the transformer resonance between two distinct frequencies. In one embodiment of the invention, the power converter can be, but is not limited to, a flyback converter and further includes a comparator and a driver. The comparator is for detecting the voltage across the second resonance capacitor and the driver is configured to drive the auxiliary switch based on the output state of the comparator. The resonant nature of the converter provides zero voltage (ZVS) for the primary switch as well as for the auxiliary switch. | 03-11-2010 |
20100067276 | TWO TERMINALS QUASI RESONANT TANK CIRCUIT - A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy source for a transformer resonance. The auxiliary switch effectively exchanges energy between the primary inductance of the transformer and the first and second resonant capacitors. The auxiliary switch effectively switches the transformer resonance between two distinct frequencies. In one embodiment of the invention, the power converter can be, but is not limited to, a flyback converter and further includes a comparator and a driver. The comparator is for detecting the voltage across the second resonance capacitor and the driver is configured to drive the auxiliary switch based on the output state of the comparator. The resonant nature of the converter provides zero voltage (ZVS) for the primary switch as well as for the auxiliary switch. | 03-18-2010 |
20100289466 | CLOSED LOOP NEGATIVE FEEDBACK SYSTEM WITH LOW FREQUENCY MODULATED GAIN - A power supply apparatus and method of regulating is provided. A clock generator circuit is configured for generating a clock signal at a predetermined frequency. An amplifier circuit is coupled with the clock generator circuit. The amplifier circuit includes a gain circuit coupled with the clock generator circuit. The amplifier circuit is configured to receive the clock signal at a switching element of the gain circuit. A controller circuit is configured for receiving a modulated error signal of the amplifier circuit and is configured for generating a pulse width modulated signal for controlling a duty cycle of the switching circuit. The switching circuit is configured for receiving the modulated error signal. The error signal is modulated using the clock signal to vary a gain value of the gain circuit according to the predetermined frequency. An output circuit is coupled with the switching circuit and is configured for generating a regulated voltage signal. The controller circuit uses the modulated error signal to substantially reduce harmonic distribution in a switching frequency of the switching circuit. Harmonic distribution in the switching circuit can be reduce by 10.0 db or greater. | 11-18-2010 |
20120113686 | VIRTUAL PARAMETRIC HIGH SIDE MOSFET DRIVER - A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The converter circuit comprises a primary and an auxiliary switch for selectively determining a resonant frequency. The auxiliary switch is enabled by a driver having an independent power source so as to allow as strong a driver as necessary to drive a large auxiliary switch. | 05-10-2012 |
20120113692 | CASCADE POWER SYSTEM ARCHITECTURE - A cascade power system comprises a non-isolated converter in a cascade configuration with an isolated converter and a controller that is coupled with the output of the isolated converter and the switching element of the non-isolated converter. The non-isolated converter steps-down the input voltage to a lower regulated voltage. The isolated converter converts the regulated voltage to a square wave signal that is output to a transformer and the controller. Thus, a the resulting feedback loop comprising the isolated converter, controller and non-isolated converter is completely independent from the output of the system. As a result, a feedback relation can be derived in the form of a feedback algorithm that can effectively regulate/adjust the output of the non-isolated converter and therefore the isolated converter output as well. Further, because the non-isolated converter steps down the voltage and the isolated converter operates on this low stepped down voltage, the system is able to be highly efficient. | 05-10-2012 |
20130314059 | POWER CONVERTER WITH NOISE IMMUNITY - A power adapter system, method and device having two feedback loops that produces an output voltage on a load with a power converter using an input power. A feedback element coupled with the power converter comprises a first feedback loop that compensates for error on the output voltage. A noise detection element coupled with the power converter comprises a second feedback loop that detects noise and produces a noise feedback voltage based on the detected noise. Based on the noise feedback voltage a controller coupled with the power converter adjusts the operation of the power converter in order to compensate for or not respond to the effects of high frequency noise such as radio frequency noise on the first feedback loop of the system. | 11-28-2013 |
20130329466 | ELECTROMAGNETIC INTERFERENCE EMISSION SUPPRESSOR - An EMI emission suppressing system, apparatus and method that enables the EMI produced by high frequency switching of a switching circuit to be suppressed via the transfer of the higher order harmonic emissions to a frequency range below the standard EMI bandwidth of less than 150 KHz by applying low frequency modulation or jitter into the feedback of a switching signal of the switching circuit. The EMI suppression is achieved with minimal added ripple on the output signal of the switching circuit by using discontinuous modulations in the form of only applying the low frequency modulation when the switch or higher order harmonic producing element of the switching circuit is accessing, or drawing power from, the main power supply. | 12-12-2013 |
20130329467 | METHOD OF SUPPRESSING ELECTROMAGNETIC INTERFERENCE EMISSION - An EMI emission suppressing system, apparatus and method that enables the EMI produced by high frequency switching of a switching circuit to be suppressed via the transfer of the higher order harmonic emissions to a frequency range below the standard EMI bandwidth of less than 150 KHz by applying low frequency modulation or jitter into the feedback of a switching signal of the switching circuit. The EMI suppression is achieved with minimal added ripple on the output signal of the switching circuit by using discontinuous modulations in the form of only applying the low frequency modulation when the switch or higher order harmonic producing element of the switching circuit is accessing, or drawing power from, the main power supply. | 12-12-2013 |
20140016359 | POWER CONVERTERS WITH QUASI-ZERO POWER CONSUMPTION - A power converter system, method and device powers a load when coupled to the load and draws a quasi-zero amount of power from the power supply when not coupled to the load. The power converter system maintains an output voltage such that the power converter system is able to properly “wake-up” when a load is coupled by intermittently operating the power converter for a preselected number of cycles when it is detected that the output voltage has fallen below a threshold level. | 01-16-2014 |
20140029312 | HIGH POWER CONVERTER ARCHITECTURE - The power converter is an integration of three topologies which include a forward converter topology, a flyback converter topology, and a resonant circuit topology. The combination of these three topologies functions to transfer energy using three different modes. A first mode, or forward mode, is a forward energy transfer that forwards energy from the input supply to the output load in a manner similar to a forward converter. A second mode, or flyback mode, stores and releases energy in a manner similar to a flyback converter. A third mode, or resonant mode, stores and releases energy from the resonant tank using a resonant circuit and a secondary side forward-type converter topologies. An output circuit of the power converter is configured as a forward-type converter including two diodes and an inductor. The output circuit is coupled to a secondary winding of a converter transformer. | 01-30-2014 |
20140029313 | HIGH POWER CONVERTER ARCHITECTURE - The power converter is an integration of three topologies which include a forward converter topology, a flyback converter topology, and a resonant circuit topology. The combination of these three topologies functions to transfer energy using three different modes. A first mode, or forward mode, is a forward energy transfer that forwards energy from the input supply to the output load in a manner similar to a forward converter. A second mode, or flyback mode, stores and releases energy in a manner similar to a flyback converter. A third mode, or resonant mode, stores and releases energy from the resonant tank using a resonant circuit and a secondary side forward-type converter topologies. | 01-30-2014 |
20140043863 | NOVEL CONTROL METHOD TO REDUCE SWITCHING LOSS ON MOSFET - A method of controlling a switching mode power converter enables zero voltage switching by forcing a voltage across the main switch to zero. This is accomplished by sensing when a current on the secondary side of the power converter drops to zero, or other threshold value, and then generating a negative current through the secondary winding in response. The negative secondary current results in a corresponding discharge current in the primary winding, which reduces the voltage across the main switch. The voltage across the main switch is monitored such that when the voltage reaches zero, or other threshold value, the main switch is turned ON. In this manner, the circuit functions as a bi-directional current circuit where a forward current delivers energy to a load and a reverse current provides control for reducing the voltage across the main switch to enable zero voltage switching. | 02-13-2014 |
20140204619 | ENERGY CONVERSION ARCHITECTURE WITH SECONDARY SIDE CONTROL DELIVERED ACROSS TRANSFORMER ELEMENT - A switched mode power converter is configured having predominate secondary side control. A primary side driving circuit is configured as a responsive state machine the output of which is input as the driving signal for a main switch. An output voltage, current or power is sensed and the secondary side controller compares the sensed output characteristic with a predefined reference. The comparison results in an error that signifies an amount that the output is out of regulation. The secondary side controller drives a secondary side switch to generate a voltage pulse across the secondary winding. The voltage pulse has a pulse width that represents the amount of error in the output characteristic. The voltage pulse is transmitted across the transformer and received by the primary side driving circuit, which generates a driving signal modulated according to the voltage pulse and drives the main switch to regulate the output characteristic. | 07-24-2014 |
20140204622 | RECONSTRUCTION PULSE SHAPE INTEGRITY IN FEEDBACK CONTROL ENVIRONMENT - A switched mode power converter includes a closed loop feedback control mechanism for regulating an output characteristic and a resonant type circuit for inclusion of resonant energy delivery. The characteristic impedance of the resonant type circuit is modified from an optimal energy transfer configuration to one that dampens fluctuations in a feedback signal used by the closed loop feedback mechanism. The modified characteristic impedance functions to dampen those fluctuations in the feedback signal resulting from leakage inductance energy provided by the resonant type circuit. | 07-24-2014 |
20140266027 | SWEEP FREQUENCY MODE FOR MULTIPLE MAGNETIC RESONANT POWER TRANSMISSION - A power transmission pad is configured to provide wireless power transmission to multiple portable electronic devices where each device is orientation-free relative to the pad. The power transmission pad is also configured to be power adaptive by changing the power transmission level depending on the number of devices being concurrently charged. Each device, is placed within the magnetic field for the purpose of charging the device battery. The power transmission pad includes a sweep frequency generator for generating power transmissions across a frequency spectrum. The number of devices to be charged is determined as well as an optimal frequency for maximum energy transfer to each device. A single combined optimal frequency is determined using the optimal frequencies determined for each individual device. The sweep frequency generator is locked to the single combined optimal frequency and a power transmission level is set according to the number of devices. | 09-18-2014 |
20140266028 | SWEEP FREQUENCY MODE FOR MAGNETIC RESONANT POWER TRANSMISSION - A power transmission pad is configured to provide wireless power transmission to a receiving device where the receiving device is orientation-free relative to the pad. The pad functions as a transmitter and is magnetically “hot”, meaning the pad generates a magnetic field when powered on. The receiving device, such as a cell phone, tablet, or other portable electronic device, is placed within the magnetic field for the purpose of charging the device battery. In contrast to conventional wireless battery charging systems, there are no restrictions on the orientation of the receiving device relative to the pad. The power transmission pad includes a sweep frequency generator for generating power transmissions across a frequency spectrum. An optimal frequency is determined for maximum energy transfer to the receiving device, and the sweep frequency generator is locked to the determined optimal frequency. | 09-18-2014 |
20140266029 | SWEEP FREQUENCY FOR MULTIPLE MAGNETIC RESONANT POWER TRANSMISSION USING ALTERNATING FREQUENCIES - A power transmission pad is configured to provide wireless power transmission to multiple portable electronic devices where each device is orientation-free relative to the pad. The power transmission pad is also configured to be power adaptive by changing the power transmission level depending on the number of devices being concurrently charged. Each device, is placed within the magnetic field for the purpose of charging the device battery. The power transmission pad includes a sweep frequency generator for generating power transmissions across a frequency spectrum. The number of devices to be charged is determined as well as an optimal frequency for maximum energy transfer to each device. The sweep frequency generator is set to cycle through the optimal frequencies determined for each device. | 09-18-2014 |
20140266321 | DEPLETION MOSFET DRIVER - A driver circuit is configured using a depletion-mode MOSFET to supply an output voltage across an output capacitor. The driver circuit includes a resistor positioned between two terminals of the MOSFET. In the case of an n-channel depletion-mode MOSFET, the resistor is coupled to the source and the gate. The circuit is a current controlled depletion driver that turns OFF the depletion-mode MOSFET by driving a reverse current through the resistor to establish a negative potential at the gate relative to the source. A Zener diode is coupled between the source of the depletion-mode MOSFET and the output capacitor to establish a voltage differential between the output and the MOSFET source. | 09-18-2014 |
20140268901 | POWER MANAGEMENT INTEGRATED CIRCUIT PARTITIONING - A switched mode power converter includes a feedback mechanism by which a coded train of pulses with well defined integrity is generated on a secondary side of the power converter and transmitted to the primary side for decoding and application by a waveform analyzer to regulate the power converter output. The pulse train is modulated by a secondary side controller and transmitted across an isolation galvanic barrier. The main transformer is used as the signal transmitter from the secondary side to the primary side of the power converter. The coded pulse train is recognized by a controller on the primary side and translated into a regulating driving signal for a main switching element. The transmitted coded pulse train can be embedded with very high frequency modulation that allows the isolation galvanic barrier to act as a capacitive signal transmitter. | 09-18-2014 |
20140268911 | POWER MANAGEMENT INTEGRATED CIRCUIT PARTITIONING WITH DEDICATED PRIMARY SIDE CONTROL WINDING - A switched mode power converter having a feedback mechanism by which a coded train of pulses with well defined integrity is generated on a secondary side of the power converter and transmitted to a dedicated control signal winding on the primary side for decoding and application to regulate the power converter output. The control signal winding enables separation of control signal transmission and power transmission resulting in improved processing of the control signal by a primary side controller. The pulse train is modulated by a secondary side controller, transmitted across a transformer and received by the control signal winding, and supplied to the primary side controller. Coded information is included in the coded pulse train by modulating pulses of the pulse train. | 09-18-2014 |
20140268912 | NO LOAD DETECTION AND SLEW RATE COMPENSATION - The power regulation control circuit is implemented during two modes. A first mode is a sleep mode and a second mode is a wake-up mode. During the sleep mode, the power supply detects a no-load presence and artificially increases the output voltage Vout to its maximum allowable value. In some embodiments, this is accomplished by pulling up an output of a error amplifier that feeds a PWM module. During the wake-up mode when the power supply wakes up from the sleep mode under maximum load, the output voltage Vout sinks from the artificially higher voltage, but still stays above a minimum operational voltage level. A slew rate compensation can be implemented to control a rate at which the output voltage drops when a load is applied. The artificially high output voltage during no-load condition and the slew rate compensation provide open loop voltage adjustment. | 09-18-2014 |
20140268955 | NO LOAD DETECTION - A power regulation control circuit is implemented as part of a power converter. The power regulation control circuit is implemented during two modes, a sleep mode and a wake-up mode. During the sleep mode, the power regulation control circuit detects a no-load presence and artificially increases the output voltage Vout to its maximum allowable value. This can be accomplished by pulling up an output of an error amplifier that feeds a PWM module. During the wake-up mode while the power converter wakes up from the sleep mode under maximum load, the output voltage Vout sinks from the artificially higher voltage, but still stays above a minimum operational voltage level. A slew rate compensation can be implemented to control a rate at which the output voltage drops when a load is applied. The artificially high output voltage during no-load condition and the slew rate compensation provide open loop voltage adjustment. | 09-18-2014 |