A system for transforming the voltage of AC electrical energy by resonant charge exchange between a first node and a second node. The system includes a capacitor or series-connected column of capacitors and a controller that is configured to cause the system to repetitively conduct a primary charge exchange by resonantly exchanging energy between the capacitor or the series-connected column of capacitors and the first node, and then electrically isolate the capacitor or the series-connected column of capacitors. During the electrical isolation the system can electrically reconfigure the series-connected column of capacitors. The system then conducts a secondary charge exchange by resonantly exchanging energy between the capacitor or the reconfigured series-connected column of capacitors and the second node.

Circuit comprising: a first switch (1S) having: a first side (FS) connected to an input node (IN); and a second side (SS); a first capacitor (FC) having: FS connected to SS of 1S; and SS; a second switch having: FS connected to SS of FC; and SS connected to a voltage level node; a third switch having: FS connected to SS of FC; and SS connected to a voltage output node; a fourth switch (4S) having: FS connected to IN; and SS; a second capacitor (SC) having: FS connected to SS of 4S; and SS; a fifth switch having: FS connected to SS of SC; and SS connected to the voltage level node; a sixth switch having: FS connected to SS of SC; and SS connected to the voltage output node; a first connection node connected to FS of FC; and a second connection node connected to FS of SC.

A power converter is disclosed. The power converter includes a Single-Input-Multiple-Output (SIMO) device includes a first transistor connected to an input and a first end of an inductor, a second transistor connected to a second end of the inductor and a first output, and a third transistor connected to the second end of the inductor and a second output. The power converter also includes a controller connected to the SIMO device and is configured to maintain a minimum inductor current through the inductor between charging cycles and to cause the minimum inductor current to transition to a charging inductor current during a charging cycle. The charging inductor current is based on a difference between an output voltage signal and a target voltage signal.

A voltage converter circuit includes a capacitor having a first end selectively connected to an input power source through a first input switch and a second end selectively connected to the input power source through a second input switch, and a single inductor configured to generate an output voltage in response to a voltage of a node between the single inductor and the first input switch, selectively connect the input power source through the first input switch at the node, and connect the first end of the capacitor at the node.

Described are circuits and techniques to increase the efficiency of radio-frequency (rf) amplifiers including rf power amplifiers (PAs) through “supply modulation” (also referred to as “drain modulation” or “collector modulation”), in which supply voltages provided to rf amplifiers is adjusted dynamically (“modulated”) over time depending upon the rf signal being synthesized. For the largest efficiency improvements, a supply voltage can be adjusted among discrete voltage levels or continuously on a short time scale. The supply voltages (or voltage levels) provided to an rf amplifier may also be adapted to accommodate longer-term changes in desired rf envelope such as associated with adapting transmitter output strength to minimize errors in data transfer, for rf “traffic” variations.

A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit which switch a first terminal and a second terminal of an inductor for buck-boost conversion; at least one low dropout regulator correspondingly coupled to at least one output high side switch in the output switch unit to correspondingly convert at least one low dropout voltage into at least one output voltage; and a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between the input voltage and the corresponding low dropout voltage; wherein when the corresponding conversion voltage difference is lower than a reference voltage, the bypass control signal controls a corresponding bypass switch to electrically connect the input voltage with the corresponding low dropout node.

A non-isolated power supply. A positive power and a negative power are respectively formed by charging a +VCC1 energy storage filter and a −VCC2 energy storage filter connected in series and discharging the +VCC1 energy storage filter 102 and the −VCC2 energy storage filter. The output positive and negative power may be differently combined by changing the capacities of the +VCC1 energy storage filter and the −VCC2 energy storage filter and may be equal or unequal.

A single-inductor multiple-output (SIMO) converter includes a converter configured to provide respective voltages of a plurality of channels with a single inductor and a control logic configured to control switches of the converter based on clocks corresponding to the plurality of channels, wherein the control logic is configured to compare an output voltage of a selected channel of the plurality of channels that corresponds to a control target to a reference voltage of the selected channel based on a clock of the selected channel and operate in one of a first mode that adaptively adjusts a number of times that a pulse triggering a power transfer to the channel is generated, and a second mode that blocks a generation of the pulse.

A voltage modulation circuit includes a charge pump circuit and a voltage detection circuit. The voltage detection circuit is coupled to the charge pump circuit. Herein, the charge pump circuit supports a plurality of power supply modes with different conversion rates and is configured to perform a power supply operation in a selected power supply mode of the power supply modes according to a control signal, to convert a power supply voltage into at least one output voltage, and to output a wake-up signal when switching of the selected power supply mode meets a specific condition. The voltage detection circuit is activated by the wake-up signal, and is configured to detect the output voltage and to suspend the power supply operation of the charge pump circuit according to a magnitude of the output voltage.

A power converter is disclosed. The power converter includes a Single-Input-Multiple-Output (SIMO) device includes a first transistor connected to an input and a first end of an inductor, a second transistor connected to a second end of the inductor and a first output, and a third transistor connected to the second end of the inductor and a second output. The power converter also includes a controller connected to the SIMO device and is configured to maintain a minimum inductor current through the inductor between charging cycles and to cause the minimum inductor current to transition to a charging inductor current during a charging cycle. The charging inductor current is based on a difference between an output voltage signal and a target voltage signal.