Samsung Electronics Co., Ltd.

Sung-Woo Moon

Dong-Jin Keum

Pyung-Woo Yeon

Yus Ko

Kyung-Goo Moh

Myeong-Lyong Ko

Hyun-Wook Yoo

Gil-Won Yoon

Min-Ho Choi

Hwa-yeal Yu

Gwang-Yol Noh

Yu-Seok Ko

Filippo Neri

A voltage converter includes a high voltage regulator, a buck converter and a dual input linear regulator unit. The high voltage regulator converts a rectified voltage to a first load voltage. The rectified voltage is rectified from an input voltage. The buck converter generates an output voltage having a first level based on the rectified voltage during a stabilizing period and provides a transition detection signal that is enabled when the output voltage transitions to the first level. The stabilizing period is successive to an initializing period. The dual input linear regulator unit receives the first load voltage, the output voltage and a reference voltage, generates a second load voltage based on the first load voltage during the initializing period, and generates the second load voltage based on the output voltage during the stabilizing period.

Voltage converter, wireless power reception device and wireless power transmission system including the same

A method of operating a buck-boost converter including an inductor and a capacitor includes; operating the buck-boost converter in boost mode until a level of an input voltage applied at an input node of the buck-boost converter reaches a desired level of an output voltage apparent at an output node of the buck-boost converter, and after the level of an input voltage reaches the desired level of the output voltage, operating the buck-boost converter in buck mode, wherein operating the buck-boost converter in buck mode and operating the buck-boost converter in boost mode overlap at least in part temporally proximate a point at which the level of the input voltage exceeds the level of the output voltage.

Buck-boost converter and operating method

A switching regulator includes a DC-DC converter and a dynamic voltage positioning circuit. The DC-DC converter includes an inductor connected between an input port and an output port. The dynamic voltage positioning circuit includes a sensing circuit and a mirroring circuit. The sensing circuit is configured to sense an inductor current flowing through the inductor, and to convert a voltage applied to a direct current resistance (DCR) of the inductor into a droop current using a variable resistor. The mirroring circuit is configured to cause a voltage drop at the output port of the DC-DC converter based on a current corresponding to a difference between a bias current and the droop current.

Switching regulators, power management devices and systems including the same

A bi-directional voltage positioning circuit includes a voltage to current converter, a current mirror circuit and a switch. The voltage to current converter converts a sensing voltage to a first current, and the sensing voltage is sensed based on a current flowing through an output coil connected between a switching node and an output node. The current mirror circuit mirrors the first current to generate a second current and a third current, the second current is N times greater than the first current, the third current is M times greater than the first current, and N and M are real numbers greater than zero. The switch provides a feedback node with one of the second current and third current in response to a switching control signal, and an output voltage of the output node is divided at the feedback node.

Bi-directional voltage positioning circuit, voltage converter and power supply device including the same

A wireless power transmission device may comprise a source coil; and/or a resonance coil inductively coupled to the source coil. The source coil may transmit power outside of the wireless power transmission device in an electromagnetic induction type during a first interval. The source coil may transmit the power to the resonance coil in the electromagnetic induction type and the resonance coil may transmit the power received from the source coil to the outside of the wireless power transmission device in a magnetic resonance type during a second interval that is different from the first interval.

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Seongnam-si, South Korea

Sung-Woo Moon