The power supply system includes a first voltage conversion unit, where the first voltage conversion unit is an isolated voltage conversion unit, and the first voltage conversion unit is connected to a power supply, and is configured to convert a voltage of the power supply into a power supply voltage of the service board, that is, a first voltage; and a second voltage conversion unit, where the second voltage conversion unit is a non-isolated voltage conversion unit, the second voltage conversion unit is deployed on the service board, and the second voltage conversion unit is configured to convert the first voltage into a power supply voltage of a first load module on the service board, that is, a second voltage.

A power converter circuit includes a chopper circuit configured to receive an input voltage and generate a chopper voltage with an alternating voltage level based on the input voltage, an autotransformer including at least one tap, the autotransformer being coupled to the chopper circuit and configured to generate a tap voltage at the at least one tap, and a selector circuit configured to receive a plurality of voltage levels. At least one of these the voltage levels is based on the at least one tap voltage. The selector circuit is further configured to generate a selector output voltage based on the plurality of voltage levels such that the selector circuit selects two of the plurality of voltage levels and switches at a switching frequency between the two voltage levels.

Methods and apparatus relating to a compact partitioned capacitor design for multiple voltage and/or load domains (e.g., with improved decoupling) are described. In an embodiment, a capacitor provides substrate decoupling for a plurality of loads. Moreover, the capacitor is capable of decoupling two or more voltage domains. Furthermore, in some embodiments the capacitor is capable of decoupling two or more voltage domains and mitigating self-noise and/or cross-noise between them. Other embodiments are also disclosed and claimed.

A device for voltage conversion includes a first, transformerless direct voltage converter unit having a first output potential connection and a second transformerless direct voltage converter unit having a second output potential connection. The two direct voltage converter units have a common input potential connection and a common reference potential connection. The first direct voltage converter unit generates, from the input voltage potential, a first output voltage potential on the first output potential connection, which has a higher voltage potential value relative to the reference voltage potential. The second direct voltage converter unit generates, from the input voltage potential, a second output voltage potential on the second output potential connection, which has a lower voltage potential value relative to the reference voltage potential. The device can be cost-effectively produced and provides sufficient safety.

A power converter includes a plurality of switches, a transformer electrically connected between some and other of the switches, and a plurality of series connected capacitors electrically connected between the switches and an output of the power converter. A controller operates the switches such that a voltage at an input of the power converter and across each of the capacitors is same and a voltage at the output is double the voltage at the input.

A system includes an inductor having first and second terminals. First and second transistors have first terminals connected to the first and second terminals of the inductor, respectively, and second terminals connected to a power supply and a common potential, respectively. Third and fourth transistors have first terminals connected to the first and second terminals of the inductor, respectively, and second terminals providing first and second output voltages of first and second polarities, respectively. First and second feedback circuits generate first and second feedback signals based on the first and second output voltages, respectively. A first control circuit controls the first and third transistors based on the second feedback signal and not based on the first feedback signal. A second control circuit controls the second and fourth transistors based on the first feedback signal and not based on the second feedback signal.

A method and apparatus include a primary transformer coil, a secondary transformer coil, and a center tapped inductor coupled to the secondary transformer coil. A first switch may be in electrical communication with the center tapped inductor and may be configured to affect the first output voltage. A second switch may be in electrical communication with the center tapped inductor and may be configured to affect the second output voltage. In a particular example with an analog current (AC) output voltage, the two output voltages are out of phase to each other. In a direct current (DC) implementation, the transformer may be operated to output a positive and a negative output voltage. The apparatus may function as a resonant converter, or may operate in non-resonant mode. In one implementation, an H bridge may provide reactive power support. An inductor filter may be in electrical communication with the secondary transformer coil. Where desired, a diode bridge may be in electrical communication with the primary transformer coil.

Provided are a coupled inductor and a power module including the coupled inductor. A coupled inductor includes: a magnetic core, a first winding and a second winding, where a first passage is formed in the magnetic core; a part of the first winding and a part of the second winding pass through the first passage, and the first winding crosses with the second winding outside the first passage. Another coupled inductor includes: a magnetic core, a first winding and a second winding, where the magnetic core has a first passage and a second passage in parallel, both run through the magnetic core from one end face thereof to another opposite end face, where the first winding and the second winding both penetrate the first passage and the second passage, such that differently-named terminals of the windings are located on the same end face of the magnetic core.

A time-multiplexing resonant drive scheme is described that reuses an inductor circuit for multiple functional purposes in a Mixed Reality (MR) device. A driver circuit and a multiplexer circuit are dynamically configured by a controller circuit for three operating modes. In the first mode, energy is coupled from a battery to the inductor circuit in a forward direction to charge the inductor circuit and generate a positive power supply voltage. In the second mode, energy is coupled from to the inductor circuit in a reverse direction to charge the inductor circuit and generate a negative power supply voltage. In the third mode, the inductor is operated with an antenna as part of a resonance drive circuit, where facial movements of the user can be detected based on the response. Reduced component count and reduced cost requirements are achieved by the described scheme.

A step-up/down DC converter applied to achieve a characteristic of zero-ripple voltage, which ripple voltage is near zero, is disclosed. The converter includes a ripple-filtering inductor, a power isolating and converting unit, a power switch, a first inductor, a first capacitor, a second capacitor, and a rectifying switch. The power isolating and converting unit comprises windings for isolation an input stage connected to a power source from an output stage connected to a load. The power switch, the first inductor, and the first capacitor are arranged at the input stage, and the second capacitor and the rectifying switch are arranged at the output stage. The ripple-filtering inductor, which may be arranged at the input or output stage, and the first inductor divide the power supplied from the power source, thus the voltage drop of the first inductor is reduced for smoothing the ripple voltage at the output stage.