ENERGY TRANSFER ASSEMBLY WITH TUNED LEAKAGE INDUCTANCE AND COMMON MODE NOISE COMPENSATION
Granted: June 7, 2012
Application Number:
20120140525
An energy transfer assembly with tuned leakage inductance and common mode noise compensation is disclosed. An example energy transfer assembly for use in a resonant power converter includes a first winding wound around a bobbin mounted on a magnetic core. The first winding has a first number of layers proximate to a first end along a length of the bobbin and a second number of layers proximate to a second end along the length of the bobbin. The energy transfer assembly also includes a…
FORWARD CONVERTER TRANSFORMER SATURATION PREVENTION
Granted: June 7, 2012
Application Number:
20120140528
A power converter in one aspect limits the magnetic flux in a transformer. A control circuit included in the power converter includes a pulse width modulator, a logic circuit and a saturation prevention circuit. The saturation prevention circuit asserts a first signal when a first integral value of the input voltage reaches a first threshold value and asserts a second signal after a delay time that begins when a difference between the first integral value and a second integral value of a…
METHOD AND APPARATUS FOR IMPLEMENTING AN UNREGULATED DORMANT MODE WITH OUTPUT RESET IN A POWER CONVERTER
Granted: June 7, 2012
Application Number:
20120139342
An implementation of an unregulated dormant mode with an output reset controller in a power converter is disclosed. An example method for controlling an output of a power converter includes generating a drive signal with a drive signal generator to regulate a flow of energy to one or more loads coupled to an output of the power converter in response to an energy requirement of the one or more loads. The drive signal generator is rendered dormant to cease for a first time period the…
FLYBACK POWER CONVERTER WITH DIVIDED ENERGY TRANSFER ELEMENT
Granted: May 17, 2012
Application Number:
20120119676
A divided structure energy transfer assembly for use in a flyback power converter is disclosed. An example energy transfer includes first and second magnetic cores. First and second input windings are wound around the first and second magnetic cores, respectively. The first input winding is coupled in parallel with the second input winding. First and second output windings are wound around the first and second magnetic cores, respectively. A rectified output of the first output winding…
LOW PROFILE COIL-WOUND BOBBIN
Granted: May 17, 2012
Application Number:
20120119865
A low profile coil-wound bobbin includes a spool, a terminal, a lower flange, and a terminal base member. The spool is configured to have a coil-wire arrangement wound around an axis the spool. The terminal is to be coupled to the coil-wire arrangement and a first side of a circuit board such that the axis of the spool is substantially normal to the circuit board and the bobbin extends completely through the circuit board. The lower flange is coupled to the spool to at least partially…
ELECTROSTATIC DISCHARGE CONDUCTING PATHWAY HAVING A NOISE FILTER SPARK GAP
Granted: May 17, 2012
Application Number:
20120120539
A printed circuit board includes a primary region, a secondary region and an isolation region disposed between the primary region and the secondary region to galvanically isolate the primary region from the secondary region. The primary region is to be coupled to an AC source. The primary region also includes an electrostatic discharge (ESD) conducting pathway to redirect current to the AC source that crosses the isolation region. A spark gap is included in the ESD conducting pathway.
METHOD AND APPARATUS FOR PULSE WIDTH MODULATION
Granted: May 10, 2012
Application Number:
20120112846
An integrated control circuit according to aspects of the present invention includes a capacitor to develop a first current during a first time duration in response to a charge current and to develop a second voltage during a second time duration in response to a discharge current. A comparator is also included and is coupled to the capacitor to indicate when the voltage on the capacitor reaches the second voltage. A control logic sets a duty ratio of a periodic output signal in response…
METHOD AND APPARATUS FOR A HIGH VOLTAGE POWER SUPPLY CIRCUIT
Granted: May 10, 2012
Application Number:
20120113690
A power switch is switched to regulate an output of a power converter. A feedback signal representative of a power converter output during a feedback portion of an off time of the power switch is received. The feedback signal is above a threshold during a fraction of the feedback portion of the off time of the power switch and the feedback signal is below the threshold during another fraction of the feedback portion of the off time of the power switch. The fractions of the feedback…
METHOD AND APPARATUS FOR IMPLEMENTING A POWER CONVERTER INPUT TERMINAL VOLTAGE DISCHARGE CIRCUIT
Granted: May 3, 2012
Application Number:
20120105018
A switch is coupled to a control circuit and to an input of a power converter. The control circuit is coupled to drive the switch in a first operating mode to transfer energy from the input to an output of the power converter when an electrical energy source is coupled to the input of the power converter. The control circuit is coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input. A capacitance is coupled between input…
METHOD AND APPARATUS TO SELECT A PARAMETER/MODE BASED ON A MEASUREMENT DURING AN INITIALIZATION PERIOD
Granted: April 26, 2012
Application Number:
20120099350
An integrated circuit includes a threshold detection circuit that is coupled to measure a signal from a first resistive external circuit coupled between a fourth external terminal of the integrated circuit and a first external terminal of the integrated circuit during a duration of an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled to charge the fourth external terminal to the supply threshold value…
POWER FACTOR CORRECTION CONVERTER CONTROL OFFSET
Granted: April 19, 2012
Application Number:
20120091982
An apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM switching signal that controls a switch in a PFC converter. The control unit includes a PWM converter to produce a PWM signal responsive to an output voltage of the PFC converter. A switching circuit switches a current representing an input current of the PFC converter in response to the PWM signal. A circuit generates the control signal in response to the switched current. The control unit…
POWER TRANSFER BETWEEN INDEPENDENT POWER PORTS UTILIZING A SINGLE TRANSFORMER
Granted: April 19, 2012
Application Number:
20120092903
An example power delivery network includes an energy transfer element, a main power port, and a main port interface. The energy transfer element includes multiple windings, where a first power converter transfers power between a first power port and a first winding, and a second power converter transfers power between a second winding and a second power port. The main port interface is coupled cyclically reverse a dc voltage received at the main power port and provides a cyclically…
PHASE ANGLE MEASUREMENT OF A DIMMING CIRCUIT FOR A SWITCHING POWER SUPPLY
Granted: April 19, 2012
Application Number:
20120092902
An example controller for a switched mode power supply includes a zero-crossing detector and a drive signal generator. The zero-crossing detector is coupled to generate a zero-crossing signal representative of a phase angle of a dimmer output voltage for a half line cycle of the power supply. The drive signal generator controls switching of a switch to regulate an output of the power supply in response to a feedback signal representative of the output. The drive signal generator further…
CONTROLLER WITH PUNCTUATED SWITCHING CONTROL CIRCUIT
Granted: April 19, 2012
Application Number:
20120092900
An example controller for use in a power supply includes a zero crossing detection (ZCD) circuit and a punctuated switching control circuit. The ZCD circuit is coupled to generate a ZCD signal in response to a zero-crossing of an ac input voltage of the power supply. The punctuated switching control circuit is coupled to the ZCD circuit to generate a switching signal to control a switch to regulate an output of the power supply. The punctuated switching control circuit generates the…
SINGLE-STAGE POWER SUPPLY WITH POWER FACTOR CORRECTION AND CONSTANT CURRENT OUTPUT
Granted: April 12, 2012
Application Number:
20120086421
An example controller includes a delayed ramp generator, an integrator, an arithmetic operator, and a drive signal generator. The integrator integrates an input current sense signal representative of an input current of the power supply to generate an input charge signal. The input current has a pulsating waveform with a period that is a switching period of a switch of the power supply. The arithmetic operator circuit generates an input charge control signal responsive to the input…
METHOD AND APPARATUS FOR LIMITING MAXIMUM OUTPUT POWER OF A POWER CONVERTER
Granted: April 12, 2012
Application Number:
20120087156
An example power converter includes an energy transfer element, a switch, a controller, and a current offset circuit. The controller switches the switch between an ON state and an OFF state to regulate the output of the power converter and is adapted to terminate the ON state of the switch in response to a switch current flowing through the switch reaching a switch current threshold. The current offset circuit is coupled to the input to be directly powered from an input voltage of the…
METHOD AND APPARATUS FOR SIMPLIFYING THE CONTROL OF A SWITCH
Granted: April 5, 2012
Application Number:
20120081098
A circuit for use in a half bridge converter includes a high side switch coupled between a positive input terminal and a first terminal of a primary transformer winding. A low side switch is coupled between a negative input terminal and the first terminal. A first control circuit is coupled to the high side switch to sense a slope of a voltage across the high side switch while the high side switch is off to control the high side switch in response to the sensed slope across the high side…
METHOD AND APPARATUS TO LIMIT MAXIMUM SWITCH CURRENT IN A SWITCHING POWER SUPPLY
Granted: April 5, 2012
Application Number:
20120081930
An integrated circuit for use in a power supply includes a drive signal generator, a short on time detector, and an oscillator. The drive signal generator generates a drive signal in response to a clock signal. The short on time detector provides an output indicating that consecutive on times of the drive signal are short on times. An on time of the drive signal is a short on time if a switch current of the switch exceeds a current limit after a leading edge blanking period and if the on…
METHOD AND APPARATUS TO CONTROL A POWER CONVERTER HAVING A LOW LOOP BANDWIDTH
Granted: April 5, 2012
Application Number:
20120081931
An example controller includes a feedback sensor circuit that receives a feedback signal representative of an output of a power converter. A feedback sampling signal generator is coupled to generate a feedback sampling signal. The feedback sensor circuit samples the feedback signal in response to the feedback sampling signal. A state machine controls switching of a switch of a power converter circuit according to one of a plurality of operating condition states in response to the…
METHOD AND APPARATUS FOR IMPLEMENTING SLEW RATE CONTROL USING BYPASS CAPACITOR
Granted: March 22, 2012
Application Number:
20120068680
An example circuit includes a regulator circuit coupled to first and second nodes. A capacitance circuit and a slew rate control circuit are coupled between the first and second nodes. The regulator circuit is coupled to charge a capacitance of the capacitance circuit with a charge current. The slew rate control circuit is coupled to control a change in voltage over change in time between the first and second nodes during a power up mode of the circuit. The slew rate control circuit…
