Abstract: In one embodiment, a controller for a power supply may be configured to operate as a quasi-resonant controller while operating in a discontinuous current mode and to operate as one of a pulse width or pulse frequency modulation controller while operating in a continuous current mode. The controller may have an embodiment that varies a frequency of the switching drive signal around a center frequency while operating in the continuous current mode, and varies a value of a current sense signal but not vary the frequency of the switching drive signal around a center frequency while operating in the discontinuous current mode.

Abstract: Methods and apparatus to digitally control pulse frequency modulation pulses in power converters are disclosed. An example apparatus includes a low-side controller structured to, when an inductor current corresponds to a first current direction during a low-side control signal of a power converter, decrease a first duration of the low-side control after the first duration; and when the inductor current corresponds to a second current direction during the low-side control signal of the power converter, increase the first duration of the low-side control after the first duration; and a high-side controller structured to, when a sum of the first duration and a second duration corresponding to a high-side control of the power converter does not satisfy target pulse length, increase a third duration of the high-side control after the third duration; and when the sum of the first duration and the second duration satisfies the target pulse length, decrease the third duration of the subsequent high-side control.

Abstract: An insulation type step-down converter includes first and second step-down transformers each of which includes an input-side coil and an output-side coil. First, second, third, and fourth rectifier elements are connected in series with first, second, third, and fourth series coils, respectively, the first, second, third, and fourth series coils each having the output-side coil of the first step-down transformer and the output-side coil of the second step-down transformer connected in series. The first to fourth series coils are connected to smoothing coils. The connection is such that electric currents flow simultaneously only in one of the first and second series coils and one of the third and fourth series coils in an alternate manner, and electric currents flowing simultaneously in one of the first and second series coils and one of the third and fourth series coils are opposite in direction to each other.

Abstract: A digital LDO regulator includes: a pulse control circuit for generating a proportional control signal based on an error code, generating an integral control signal that toggles during a first section, which includes an initialization section and an integration section, based on the proportional control signal, and generating a state information signal that defines a steady state section, the initialization section, and the integration section; a proportional control circuit for outputting a first drive signal by multiplying the error code by a proportional gain factor based on the proportional control signal; an integral control circuit for outputting a second drive signal by multiplying the error code by an integral gain factor based on the state information signal and the integral control signal; and a driver for adjusting the output voltage in response to the first drive signal and the second drive signal.

Abstract: There is provided a reference voltage generator for providing an adaptive voltage. The reference voltage generator includes a steady current source and a PMOS transistor and an NMOS transistor cascaded to each other. A reference voltage provided by the reference voltage generator is determined by gate-source voltages of the PMOS transistor and the NMOS transistor. As said gate-source voltages vary with the temperature and manufacturing process, the reference voltage forms a self-adaptive voltage.

Abstract: Power converters that use bi-directional switches to rectify an AC power source, rather than diode bridges, are provided. In additional to performing rectification, the bi-directional switches also control power flow through the power converter, i.e., the switches effectively implement a switching power supply to provide a desired DC voltage to a load. The use of bi-directional switches that can block current flow in either direction enables a power converter that uses minimal circuitry, has low conduction losses (high efficiency), and can operate in buck and boost modes. Furthermore, via appropriate control, the described power converter circuitry may be used both for converting from AC voltage to DC voltage, and from DC voltage to AC voltage.

Abstract: An insulated DC/DC converter includes: a transformer; a switching transistor; a rectifier circuit; a photocoupler; a feedback circuit configured to drive a light emitting element of the photocoupler such that an output voltage of the DC/DC converter approaches a target voltage; a primary side controller having a feedback terminal which is connected to a light receiving element of the photocoupler and receives a feedback signal from the photocoupler, a zero current detection terminal which receives a zero current detection signal corresponding to a voltage generated at one end of an auxiliary winding of the transformer, and a pulse modulator of a quasi-resonant mode configured to generate a pulse signal depending on the feedback signal and the zero current detection signal; and a starting control circuit which, in start-up of the DC/DC converter, electrically affects the zero current detection terminal such that an OFF time of the switching transistor lengthens.

Abstract: A voltage converter may include a first set of silicon (Si)-based power devices coupled to a first direct current (DC) voltage source and a second set of Si-based power devices coupled to a second DC voltage source. The voltage converter may also include a first set of silicon-carbide (SiC)-based power devices coupled to the first set of Si-based power devices and to the second set of Si-based power devices. Each SiC-based power device of the first set of SiC-based power devices may switch at a higher frequency as compared to each Si-based power device of the first and second sets of the Si-based power electronic devices.

Abstract: A method of monitoring a power factor correcting (PFC) power supply is provided. The method includes: powering on the PFC power supply with a constant current; starting a runtime counter that increments a count value; measuring an output voltage; calculating an output power by multiplying the constant current by the output voltage; storing the output power in a random-access memory (RAM); calculating an input power by multiplying the output power by an efficiency curve factor; and storing the input power in the RAM.

Abstract: The invention concerns an isolated DC/DC converter comprising an isolated circuit having: a first arm having a first switch, in series with a second switch; a magnetic component having two primary circuits and a secondary circuit that are separated by at least one electrical isolation barrier, said magnetic component being configured so as, during the conversion of an input voltage of the isolated DC/DC converter into an output voltage, to operate as a transformer from the primary circuits to the secondary circuit and as an impedance that stores energy in the primary circuits, and in which: the first arm comprises a first capacitance in series with the two switches and situated between the two switches, one of said primary circuits, called the second primary circuit, is connected between a first end terminal of the first arm and the connection point, called the second connection point, between the second switch of the first arm and the first capacitance, the first end terminal of the first arm correspondin

Abstract: A DC/DC conversion apparatus includes a DC voltage source that outputs a DC power supply voltage, an oscillation circuit electrically connected to the DC voltage source, switch elements, a switch controller that connects or disconnects electrical connection between the DC voltage source and the oscillation circuit by switching turn-on and turn-off of the switch elements, and switches a direction of a voltage applied to the oscillation circuit between a first direction and a second direction, and a transformation circuit that outputs a current generated in the oscillation circuit and converts the current into a DC current.

Abstract: Ideal switch bridgeless PFC topologies are presented with the purpose of increasing the efficiency in power factor correction circuits and inverter applications. The topology also leverages the new GaN switches that are available. This patent offers also a very good solution for the Zero crossing distortion problem improving greatly the THD both in power factor correction and inverter applications.

Abstract: A magnetic integrated device is disclosed, the device includes: a first magnetic core base and a second magnetic core base that are parallel and a first magnetic core column, a second magnetic core column, and a third magnetic core column that are located between the first magnetic core base and the second magnetic core base; and a first winding, a second winding, and a third winding are wound on the first magnetic core column, the second magnetic core column, and the third magnetic core column respectively in a same manner to form a closed magnetic flux loop, where the first winding, the second winding, and the third winding are separately used for connecting to a branch of a three-phase parallel circuit, and in all branches of the three-phase parallel circuit, values of currents are the same, and a difference between each two current phases is 120 degrees.

Abstract: A digital low drop-out regulator circuit includes transistor switches that are selectively actuated in response to a comparison of an output voltage at an output node to corresponding tap reference voltages. A dynamic reference voltage correction circuit operates to shift voltage levels of the tap reference voltages in response to a difference between the output voltage at the output node and an input reference voltage.

Abstract: In a power management device, a hiccup mode is implemented by using, for example, a counter to count the number of cycles for which a current limiting event has occurred and forcing the power management device to hiccup when a certain number of current limiting events have been counted. A soft start circuit is typically employed to ramp up the output voltage when the power management device is turned back on. By resetting the soft start voltage to the feedback voltage of the load of the power management device upon the first detection of a current limiting event, hiccup can be avoided because resetting the soft start voltage to the feedback voltage will reduce the current in proceeding cycles thereby avoiding additional current limiting events.

Abstract: A PFC device includes at least one main switch, a converter that converts a current to be sensed in the PFC device into a voltage to be sensed, the PFC device generating a switch control signal to control the at least one main switch based on the current to be sensed, and a voltage sensor that receives the voltage to be sensed and an offset voltage, and senses the voltage to be sensed using the offset voltage to output a sense voltage. A method includes sampling the sense voltage, determining a sense value of the offset voltage based on a sampling result, and calculating the current to be sensed based on a difference between the sense voltage and the sense value.

Abstract: A two-stage multi-phase switching power converter operates its first stage during nominal operation responsive to a nominal clocking frequency and operates its second stage during the nominal operation responsive to a second-stage clocking frequency that is greater than the nominal clocking frequency. In response to an application of a load, the first stage temporarily increases its clocking frequency from the nominal clocking frequency and implements a fixed duty cycle.

Abstract: A step-up DC-DC power converter comprises a primary side circuit and a secondary side circuit coupled through a galvanic isolation barrier. The primary side circuit comprises a positive and a negative input terminal for receipt of an input voltage and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. The galvanic isolation barrier comprises a first capacitor coupled in series with the positive input terminal of the primary side circuit and the first positive electrode of the output capacitor; and a second capacitor coupled in series with the negative input terminal of the primary side circuit and the second negative electrode of the output capacitor.

Abstract: Provided is a signal isolator with reduced power loss. The signal isolating circuit comprises an input stage and an output circuit that is connected downstream thereof and which includes a linear regulator. The linear regulator comprises an operational amplifier and a switching regulator, wherein an input of the switching regulator is connected to an output of the operational amplifier and an output of the switching regulator is fed back to a first input of the operational amplifier. The operational amplifier regulates the switching regulator such that the switching regulator provides at its output an output measuring signal for a load that corresponds to the input measuring signal.

Abstract: Controller and method for a power converter. For example, the controller includes a first controller terminal coupled to a gate terminal of a transistor. The transistor further includes a drain terminal and a source terminal, and the first controller terminal is at a first voltage as a first function of time. Additionally, the controller includes a second controller terminal coupled to the source terminal. The second controller terminal is at a second voltage as a second function of time. Moreover, the controller includes a third controller terminal coupled to a first resistor terminal of a resistor. The resistor further includes a second resistor terminal, and the third controller terminal is at a third voltage as a third function of time. Also, the controller includes a fourth controller terminal coupled to a first capacitor terminal of a capacitor.