A switching-mode power supply circuit includes a boost inductor, a boost capacitor, a storage capacitor, a transformer or DC-DC inductor, a first switching component, an output rectification component, a filter capacitor, a feedback and control circuit, first and second rectification circuits. When first switching component conducts, the boost inductor, boost capacitor and first switching component form a first boost loop, the boost inductor stores energy, and the storage capacitor, first switching component and transformer or DC-DC inductor form a first DC-DC loop. When first switching component cuts off, the boost inductor, boost capacitor, storage capacitor and transformer or DC-DC inductor form a second boost loop, and the transformer or DC-DC inductor, output rectification component and filter capacitor form a second DC-DC loop. The filter capacitor supplies energy to a load. The feedback and control circuit drives the first switching component to turn on/off according to a chopping wave having specific frequency and duty to control a voltage, current or power output to the load.

A power converter includes a PFC circuit, a first capacitor, a second capacitor and an auxiliary circuit. The PFC circuit provides a first intermediate voltage to the first capacitor. The auxiliary circuit includes a first auxiliary branch circuit and a second auxiliary branch circuit. When the first auxiliary branch circuit is enabled, and the first intermediate voltage is transmitted to the second capacitor through the first auxiliary branch circuit. When the second auxiliary branch circuit is enabled, the first intermediate voltage is boosted by the second auxiliary branch circuit, so that a second intermediate voltage is provided by the second capacitor. While an operation state of the load is switched between a light load condition and a heavy load condition, one of the first auxiliary branch circuit and the second auxiliary branch circuit is selectively enabled.

Power supply units e.g. in network operated loudspeakers are tailored to peak values that are reached only relatively rarely and then in pulses. With an intermediate storage of electrical energy in an intermediate circuit energy storage element it is possible to provide a significantly higher amount of power at least for a short period of time. The intermediate circuit energy storage element may be a capacitor or accumulator, for example, which is connected to an intermediate circuit voltage that is higher than the input voltage, and that is generated by an upconverter. A downconverter generates the output voltage of the power supply unit from the energy stored in the intermediate circuit storage element. The output voltage of the power supply unit is used as power supply for an audio amplifier. The power supply unit may provide for a short period of time a higher current or more energy respectively than the actual energy source, for example the network node. Correspondingly, the device operated with the output voltage of the power supply unit, for example the audio amplifier, can have a significantly higher effective power than previously possible for the short period of time.

An embodiment switching converter comprises an input stage; an output stage for providing an output voltage; a capacitive coupling stage for coupling the input stage to the output stage; a first switching stage configured to switch between a first state where an input voltage is provided to the input stage, and a second state where the input voltage is not provided to the input stage; a second switching stage configured to switch between a first state in which a reference voltage is provided to the output stage, and a second state in which the reference voltage is not provided to the output stage; and a voltage regulation stage configured to set, after the second switching stage switches from the first state to the second state and before the first switching stage switches from the second state to the first state, a target voltage across the input stage.

A resonant power converter for converting a DC input voltage to AC or DC output voltage, includes a transistor, and a first inductor connected to an input port for a DC voltage to be converted, the drain being connected to the input port by way of the first inductor, the converter furthermore comprising a first resonant network, connected between the drain of the transistor and ground, the first resonant network being configured so as to extract the fundamental component of a drain-source voltage of the transistor and to phase-shift it by a phase shift angle such that the fundamental component and the drain-source voltage are in phase opposition and thus generate a sinusoidal drive signal.

A circuit for supplying an error signal to a controller in a boost or SEPIC DC-DC converter includes first, second, and third Zener diodes, first, second, and third resistors, and a MOSFET or BJT switch. The circuit includes, connected to a common voltage input source, a first branch including the switch, the first Zener diode and the first resistor, a second branch including the second Zener diode and the second resistor. The first and second branches are mutually connected to the third resistor, and the third resistor is connected to the controller. A third branch includes the third Zener diode and connections to the base or gate of the switch and ground. Each of the first, second, and third Zener diodes are reverse-biased. The second and third Zener voltages are equal and higher than the first Zener voltage.

A system includes a two-conductor loop in which the loop current or current signal is controlled by a loop current controller to be proportional to a signal output from a sensor. The system further includes energy harvesting circuity in electrical connection with the two-conductor loop which includes a second current controller in parallel electrical connection with the loop current controller and a power converter in electrical connection with the second current controller. The second current controls a portion of current drawn from the two-conductor loop and delivered to the power converter from an output port thereof. The portion of the current drawn from the two-conductor loop is returned to the loop current controller from the energy harvesting circuit. Noise in the portion of the current drawn from the two-conductor loop by the second current controller is controlled by the second current controller to be below a predetermined threshold.

A DC/DC converter is provided which can be produce easily and inexpensively with an alternating current component with which a superimposed direct current is reduced in an output voltage (ripple). A C+DC/DC converter includes an input and output, a series arm which is arranged between the input and the output and in which at least one first inductor and first capacitor are arranged, and a capacitor arranged in a first shunt arm at the output. A second shunt arm arranged parallel to the first shunt arm is equipped with a first switch and a second switch arranged in series and a second inductor such that the first connection of the inductor is connected to a point between the first inductor and the first capacitor and the second connection of the inductor is connected to a point between the first and the second switch.

A converter circuit arrangement and a method for operating a converter circuit arrangement are disclosed. In an embodiment an arrangement includes a switched-mode input converter sub-stage comprising a step-up converter configured to convert a rectified input voltage on an input side into an intermediate voltage higher than the rectified input voltage, a switched-mode output converter sub-stage configured to convert the intermediate voltage into a direct output voltage at an output side, a switch configured to switch both the switched-mode input converter sub-stage and the switched-mode output converter sub-stage and a control circuit configured to control the switched-mode output converter sub-stage to a power demand at the output side independent of the switched-mode input converter sub-stage by operating the switch with a controlled duty cycle, wherein the control circuit is connected to the switched-mode output converter sub-stage and the output side and configured to apply a first control parameter based on a sensed output voltage and/or a sensed output current and to apply a second control parameter based on a sensed current and/or a sensed voltage of the switched-mode output converter sub-stage.

A power converter comprising a single-ended primary-inductor converter (SEPIC) includes a first inductive element (L1) and a second inductive element (L2) that are arranged, in the usual way, to provide a first, non-isolated load. The power converter further includes an isolated load circuit comprising a third inductive element (L3) connected to a second output for delivery a second, isolated load. The third inductive element (L3) is coupled to the first inductive element (L1) and/or the second inductive element (L2) to transfer power to the isolated load circuit to deliver the second load, and wherein the first inductive element (L1), the second inductive element (L2) and the third inductive element (L3) are each wound around a single magnetic core.