Richtek Technology Corporation

Benq Corporation

Other

Qisda Corporation

Tsung-Wei Huang

Shui-Mu Lin

Jien-Sheng Chen

Chih-Ching Chen

Kwan-Jen Chu

Huan-Chien Yang

Wei-Jen Huang

Yung-Chun Chuang

Chueh-Kuei Jan

Chung-Cheng Chou

Nien-Hui Kung

Wei-Hsin Wei

Ti-Ti Liu

Pao-Hsun Yu

Chin-Chiang Yeh

Chien-Sheng Chen

Shun-Yu Huang

Chin-Tsung Chen

Ding-Yu Wei

Nang-Ching Yeung

Ta-Yung Yang

Wei-Hsu Chang

Yu-Chang Chen

Chao-Hsuan Chuang

Yu-Huei Lee

Li-Ping Yang

Ying-Hsin Hsing

Hsien-Chih She

Jiun-Jang Lin

Kun-Ming Lee

Jhen-Yu Li

Chih-Hua Hou

Tsan-Huei Wu

Chun-Jen Shih

Ruei-Hong Peng

Teng-Cheng Chen

Sheng-Kai Fan

Fan Ho

Yong-Hong Huang

Ye-Sing Luo

Chien-Tzu Ko

Chien-Yuan Cheng

Sheng-Tien Li

Hui-Wen Cheng

Kang-Ming Huang

Hsien-Chih Shen

An electronic circuit includes a first switched capacitor circuit and a second switched capacitor circuit. The first switched capacitor circuit charges and discharges a first flying capacitor to power a load. The second switched capacitor charges and discharges a second flying capacitor to power the load. When the first switched capacitor operates in a dead time, the second switched capacitor powers the load with the second flying capacitor.

Reducing output ripple voltage of multiple switched capacitor circuits by reducing overlapping of dead time

A power conversion system includes: first and second switches, a switching power converter, a battery switch and a conversion control circuit. In an external power mode, the first and second switches are controlled to generate an intermediate power from a first power and generate a second power from the intermediate power for powering an external load. In a battery power mode, the conversion control circuit controls the battery switch, the switching power converter and the second switch to generate a system power from a battery power, convert the system power to generate the intermediate power and generate the second power from the intermediate power. In the external power mode, the switching power converter is controlled to enter the battery power mode when the intermediate voltage is reduced to a transient state threshold, wherein a minimum voltage level of the intermediate power is close to a minimum voltage regulation level.

Power conversion system and method thereof

A multi-mode power system includes a battery module, a first conversion circuit, and a second conversion circuit. The battery module includes a battery path switch and a battery group. The first conversion circuit includes switches and a first capacitor, wherein the switches include the battery path switch. The multi-mode power system operates in one of plural operation mode combinations, wherein when the first conversion circuit operates in a first outgoing mode or a first bypass mode, the second conversion circuit operates in a second incoming mode, a second outgoing mode, or a second bypass mode; when the first conversion circuit operates in a first incoming mode, the second conversion circuit operates in the second incoming mode or the second bypass mode.

Multi-mode power system and power conversion circuit thereof

A control circuit for controlling a power supply circuit to provide power to a system device which includes a communication circuit includes: a pulse width modulation (PWM) controller configured to switch a transformer of the power supply circuit to generate a first output voltage; and a switched capacitor converter configured to generate a second output voltage according to the first output voltage. The second output voltage provides power to the communication circuit, wherein the communication circuit generates a power saving signal to control the PWM controller and the switched capacitor converter. When the power saving signal is enabled, the first output voltage is decreased and a duty ratio of the switched capacitor converter is increased.

Control circuit having power saving mode for use in power supply circuit

A power conversion circuit includes an N-level PWM power converter and a switching capacitor power converter. The N-level PWM power converter includes shared switches shared with the switching capacitor power converter, and PWM switches. In an N-level PWM mode, the shared switches and the PWM switches periodically switch an inductor and a capacitor, to execute power conversion between a first power and a second power by N-level PWM switching operation. The switching capacitor power converter includes the shared switches and auxiliary switches. In a capacitive conversion mode, the shared switches and the auxiliary switches periodically switch the capacitor, to execute power conversion between the first power and the second power by capacitive power conversion operation. In the capacitive conversion mode, a portion of the plural PWM switches are always OFF such that one end of the inductor is floating.

Charging system, power supply system and dual mode power conversion circuit thereof

A switched capacitor converter includes plural switch units. The switch units are configured to switch a coupling relationship of a capacitor between a first power and a second power, wherein at least one of the switch units includes a switch circuit. The switch circuit includes a first switch, a second switch, and a switch driving circuit, wherein the conduction resistance of the first switch is greater than the conduction resistance of the second switch, and the parasitic capacitance of the first switch is less than the parasitic capacitance of the second switch. The switch driving circuit turns on the first switch before the second switch is turned on and/or turns off the first switch after the second switch is turned off, such that the switching loss of the switch circuit is less than a predetermined target value.

Switched capacitor converter and switch circuit and switch thereof

A switched capacitor converter circuit includes: plural capacitors and plural switches which switch the connections of the plural capacitors periodically. In a first period, the plural switches control a first capacitor to be electrically connected between a first power and a second power, and control a second capacitor and a third capacitor to be electrically connected in series between the second power and a ground level. In a second period, the plural switches control the first capacitor and the second capacitor to be electrically connected in series between the second power and the ground, and control the third capacitor and the second capacitor to be electrically connected in parallel with the second power, thereby a second current of the second power is 4 times of a first current of the first power.

Switched capacitor converter circuit and switching converter unit thereof

A switching capacitor power conversion circuit includes: a conversion capacitor, plural conversion transistors and an output capacitor connected to an output node. In a switching conversion mode, the switching capacitor power conversion circuit switches connections of the capacitor to convert the input power into an output power on an output node. During a first pre-charging period, a first conversion transistor is controlled to provide a first pre-charging current to pre-charge the conversion capacitor to a predetermined voltage level, and the output capacitor is prevented from being charged. During a second pre-charging period, a second conversion transistor is controlled to provide a second pre-charging current to pre-charge the output capacitor to the predetermined voltage level, and the second pre-charging current supplies a load current to a load circuit.

Switching capacitor power conversion circuit and conversion control circuit and control method thereof

A switching power conversion circuit includes a conversion capacitor, a capacitive power conversion circuit, an inductor, an inductive power conversion circuit and a switching control circuit. The capacitive power conversion circuit includes plural switching devices for generating an intermediate voltage which is in a predetermined proportional relationship to the input voltage. The inductive power conversion circuit includes plural switching devices for converting the intermediate voltage to an output voltage. The plural switching devices of the capacitive power conversion circuit and the inductive power conversion circuit switch the conversion capacitor and the inductor periodically according to the duty ratio of the switching control signal generated by the switching control circuit. The capacitive power conversion circuit and the inductive power conversion circuit share one of the plural switching devices.

Switching power conversion circuit and switching circuit

A charger circuit which supplies a charging power to charge a battery circuit, includes: a conversion switch circuit, at least one capacitor and a conversion control circuit. The conversion switch circuit is coupled between a charging power and a ground level and includes conversion switches connected in series. The conversion switch circuit has battery voltage balancing nodes electrically connected to the battery circuit, such that each battery is electrically connected between two of the battery voltage balancing nodes. The conversion control circuit is coupled to the conversion switch circuit and provides operation signals to the conversion switch circuit, to respectively control the corresponding conversion switches, so that the capacitor is periodically connected in parallel to each battery of the battery circuit, thereby balancing the battery voltages of the batteries.

Charger circuit and charging control method

A multi-level switching power converter includes a multi-level power stage circuit which converts an input power to an output power. The power stage circuit includes an inductor, a conversion capacitor and plural power switches. The controller circuit controls the multi-level power stage circuit and includes: a feedback pulse generator circuit which generates a trigger pulse; a first timer circuit and a second timer circuit which determine a first time period and a second time period respectively according to the trigger pulse; and an adjusting circuit which adjusts the first time period according to a difference between the voltage across the conversion capacitor and a reference voltage such that an average of the voltage across the conversion capacitor is substantially equal to a level of the reference voltage.

Multi-level switching power converter, and controller circuit and control method thereof

A charger circuit for providing a charging current and voltage to a battery includes a power delivery unit and a capacitive power conversion circuit. The power delivery unit converts an input power to a DC voltage and current. The capacitive power conversion circuit includes a conversion switch circuit including plural conversion switches and being coupled with one or plural conversion capacitors, a regulation switch, and a conversion control circuit. In a current scaled-up charging mode, the DC current is regulated, and the conversion control circuit controls the connection of the plural conversion capacitors such that the charging current is scaled-up of the DC current substantially by a predetermined current scale-up factor. In a constant voltage linear charging mode, the conversion control circuit linearly controls the regulation switch to regulate the level of the charging voltage to a predetermined constant voltage level.

Charger circuit and capacitive power conversion circuit and charging control method thereof

A method for olfactory improvement with saccharide. The saccharide is a chitin-based material, proteoglycan, glycosaminoglycan, amino monosaccharide, N-acylated amino monosaccharide or a combination thereof.

Method for olfactory improvement with saccharide

A light emitting device driver circuit includes: a power conversion circuit, an error amplifier circuit, a sample-and-hold circuit, a load current generation circuit and a feed-forward capacitor. When the light emitting device driver circuit is in a disable phase, the sample-and-hold circuit connects a feedback signal with a second reference voltage and the sample-and-hold circuit disconnects the feedback signal from a load node, whereby the feed-forward capacitor samples a sample voltage and holds it after the disable phase transits to an enable phase. In the enable phase, the sample-and-hold circuit disconnects the feedback signal from the second reference voltage and the sample-and-hold circuit connects the feedback signal with the load node, so that during a predetermined period following the transition, there is a sufficient difference between two input terminals of the error amplifier circuit so that the load current is raised to a desired current level within the predetermined period.

Driver circuit for driving light emitting device

Growing community of inventors

Taipei, Taiwan

Tsung-Wei Huang