Abstract: The power supply apparatus includes a transformer, at least one switching element provided on a primary side of the transformer and configured to perform a switching operation to output an output voltage from a secondary side of the transformer, and a control unit configured to determine a turn-on time of a pulse signal for controlling the switching element for each of first cycles, and perform a predetermined control in which a change value of the turn-on time of the pulse signal for each of second cycles each including the first cycles becomes smaller than a change value of the turn-on time of the pulse signal for each of the first cycles, to change the second cycle depending on operation states.

Abstract: A voltage regulator includes an error amplifier, and the error amplifier includes a differential pair constituted by a pair of transistors, a current adjustment circuit that provides a bias current proportional to an output current supplied from an output transistor to the differential pair, a source output circuit and a sink output circuit that provide a current based on a current flowing through the differential pair to an output terminal of the error amplifier, and a phase compensation circuit that controls a current of the sink output circuit based on a current of the current adjustment circuit.

Abstract: The present embodiments relate generally to power controllers, and more particularly to synthetic current hysteretic control of a buck-boost DC-DC controller. In one or more embodiments, a controller includes PFM-PWM and Buck-Boost transitions with minimal circuitry and power consumption. In these and other embodiments, the controller includes a low-Iq synthetic ripple generator for use in implementing hysteretic control of a buck-boost controller.

Abstract: A circuit includes a first power transistor including a first control input and first and second current terminals. The circuit includes a second power transistor including a second control input and third and fourth current terminals. Third current terminal couples to the first current terminal, and the fourth current terminal couples to the second current terminal at an output node. An error amplifier generates an error signal based on a difference between a reference voltage and an output voltage on the output node. An adaptive buffer couples to an output of the error amplifier and couples to the first and second control inputs. The adaptive buffer causes the first power transistor to be on through a range of output current and to cause the second power transistor to be on through some, but not all, of the range of output current.

Abstract: The present embodiments relate generally to power controllers, and more particularly to synthetic current hysteretic control of a buck-boost DC-DC controller. In one or more embodiments, a controller includes PFM-PWM and Buck-Boost transitions with minimal circuitry and power consumption. In these and other embodiments, a window comparator structure is provided that is capable of generating control signals for use in buck, boost and buck-boost modes of operation.

Abstract: Switching between a dual switch topology and a bridge forward topology in a power converter includes: receiving an input voltage; providing, via the dual switch topology, an output voltage; determining that the input voltage falls below a first threshold; switching a path of the input voltage from the dual switch topology to the bridge forward topology; and providing, via the bridge forward topology, the output voltage.

Abstract: A current sensing circuit is described. The current sensing circuit is for sensing a high side current through a high side switch and/or for sensing a low side current through a low side switch of a half bridge comprising the high side switch and the low side switch, which are arranged in series between a high side potential and a low side potential. The high side switch and the low side switch are in respective on-phases in a mutually exclusive manner. The high side sensing circuit comprises mirroring circuitry to mirror a current from a first node of the high side sensing circuit to an output node of the high side sensing circuit. The current sensing circuit comprises a low side sensing circuit to provide a sensed low side current which is indicative of the low side current during an on-phase of the low side switch.

Abstract: A power conversion apparatus includes an inverter for drive controlling a plurality of switching elements, drive circuits, a control circuit, a current detection part, an overcurrent detection circuit, and a protection circuit. The protection circuit, which receives a detection signal that the overcurrent detection circuit outputs to indicate detection of overcurrent, outputs a signal to the drive circuits for turning off a switching element that has been turned on by a control signal from the control circuit for a predetermined time.

Abstract: A DC-DC converter may include a first lower FET and a first upper FET connected in series between a high potential output wiring and a low potential wiring, and a second lower FET and a second upper FET connected in series between the high potential output wiring and the low potential wiring. Diodes may be connected to the upper FETs in parallel. A main reactor may be connected to the high potential input wiring. A first sub-reactor may be connected between the main reactor and the first lower FET. A second sub-reactor may be connected between the main reactor and the second lower FET. The first upper FET and the second upper FET are not turned on during a zero-cross mode.

Abstract: A DC-to-DC power converter includes a transformer having a primary side and a secondary side, and a primary circuit electrically coupled to the primary side of the transformer. The primary circuit includes a primary microcontroller configured to generate a first energizing signal that energizes a portion of the primary circuit. The DC-to-DC power converter also includes a secondary circuit electrically coupled to the secondary side of the transformer. The secondary circuit includes a secondary microcontroller communicatively coupled to the primary microcontroller, wherein the secondary microcontroller is configured to provide an instruction to the primary microcontroller that causes the primary microcontroller to relinquish control of the primary circuit to the secondary microcontroller, and wherein the secondary microcontroller is further configured to provide a second energizing signal to the portion of the primary circuit.

Abstract: An apparatus is provided which includes: a first set of devices which is digitally controlled by a first feedback loop that includes a first comparator; and a second set of devices which is controlled by an analog circuitry which is part of a second feedback loop that includes an amplifier, wherein the first set of devices is coupled in parallel to the second set of devices.

Abstract: A power factor correction circuit can include: a power meter configured to measure THD at an input port; a switching-type regulator that is controllable by a switching control signal in order to adjust a power factor of an input signal thereof; and a controller configured to generate the switching control signal to control the switching-type regulator to perform power factor correction, where the controller minimizes the THD by adjusting a current reference signal according to a measured THD, and the current reference signal represents an expected inductor current of the switching-type regulator.

Abstract: The present disclosure is directed to a primary-controlled high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs, and may be compatible with phase-cut dimmers. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.

Abstract: A controller circuit for an AC-DC converter includes a first controller circuit block configured to drive one or more switches at the primary side of a transformer in the AC-DC converter. A second controller circuit block is configured to sense, at a secondary side of the transformer in said AC-DC converter, a secondary side signal indicative of the output signal from said AC-DC converter. The second controller circuit block generates switching control signals for the first controller circuit block as a function of the secondary side signal. An isolator circuit block between the first controller circuit block and the second controller circuit block includes an isolated transmission channel of the switching control signals from the second controller circuit block to the first controller circuit block.

Abstract: An apparatus is described comprising a bandgap reference circuit comprising: an amplifier including first and second inputs and an output; and a bandgap transistor coupled to the output of the amplifier at a control electrode thereof, the bandgap transistor being further coupled commonly to the first and second inputs of the amplifier at a first electrode thereof to form a feedback path. The apparatus further comprises a resistor coupled to the first electrode of the bandgap transistor.

Abstract: Apparatus and systems and articles of manufacture are disclosed to provide adaptive leakage compensation for powertrains. An example apparatus comprising a first current path including a first transistor and a second transistor; a second current path including a third transistor and a fourth transistor; and a current mirror including a fifth transistor and a sixth transistor, wherein a first ratio exists between the first transistor and the third transistor, a second ratio exists between the second transistor and the fourth transistor, and a third ratio exists between the fifth transistor and the sixth transistor, the third ratio greater than or equal to the second ratio, the second ratio greater than or equal to the first ratio.

Abstract: A system and method of operating an a power supply unit with a light load efficiency control system comprising a power regulator circuit for receiving an alternating current (AC) input voltage from within a range of accommodated AC input voltages and including a power factor correction (PFC) circuit and an LLC resonator circuit having a bulk capacitance voltage level and operable to receive the input AC voltage in the power supply unit and where the power supply unit generates a direct current (DC) output voltage for use by a load.

Abstract: A bidirectional resonant current-direct current conversion circuit and an uninterruptible power supply are provided. The bidirectional resonant current-direct current conversion circuit includes a full-bridge conversion module, a transformer, and a half-bridge conversion module. The full-bridge conversion module is coupled to the half-bridge conversion module via the transformer. The full-bridge conversion module is configured to convert two-level direct current power into alternating current power, and the half-bridge conversion module is configured to convert the alternating current power outputted by the full-bridge conversion module into three-level direct current power. The half-bridge conversion module is further configured to convert three-level direct current power into alternating current power, and the full-bridge conversion module is further configured to convert the alternating current power outputted by the half-bridge conversion module into two-level direct current power.

Abstract: A circuit for pre-charging an intermediate circuit having a positive branch and a negative branch includes: a first controllable energy source, a second controllable energy source, the first control energy source and second controllable energy source being looped in series between the positive branch and the negative branch on the output side, a suppression unit, the suppression unit being looped between a connection node of the output of the first controllable energy source and the output of the second controllable energy source and a reference potential, and a controller. The controller is connected to the first energy source and the second energy source for signaling purposes and is configured to actuate the first energy source and the second energy source in order to generate an output signal pattern in order to pre-charge the intermediate circuit.

Abstract: A synchronous rectifier alternator and a power allocation method thereof are provided. The synchronous rectifier alternator includes an alternator, a synchronous rectifier circuit and a controller. The alternator converts mechanical energy to alternating current (AC) electrical energy. The synchronous rectifier circuit converts the AC electrical energy to direct current (DC) electrical energy and provides the DC electrical energy to a load. The controller detects a voltage level of the DC electrical energy. When the controller detects that the voltage level is higher than or equal to a first threshold voltage value, the controller controls ONs and OFFs of first transistors and second transistors of the synchronous rectifier circuit, such that at least one of regulator diodes of the synchronous rectifier circuit, a stator of the alternator and the load consume power of the alternator.