Dialog Semiconductor Gmbh

Diaglo Semiconductor Inc.

Pengju Kong

Hien Huu Bui

Fuqiang Shi

Jianming Yao

Tao Li

Duc Doan

Wenbo Liang

Guang Feng

Qingqing Zong

Hanguang Zhang

Judy Sha

Yong Li

Cong Zheng

Wenduo Liu

Kai-Wen Chin

Juyoung Yoon

David H Nguyen

Xiaoyan Wang

Yimin Chen

Mengfei Liu

Mingsheng Peng

Xiaye Wang

Henry Wong

John William Kesterson

Junjie Zheng

Andrey B Malinin

Qiu Sha

Andrew Kwok-Cheung Lee

Jiandong Zhang

Yong Xiong Lin

John Shi

Jiaji Qi

Zhi Yang

Xiyuan Liu

Kuangzhe Xu

Wesley Ma

A flyback converter is provided that includes a high-side synchronous rectifier switch transistor. A secondary-side synchronous rectifier controller powered by a power supply voltage controls a cycling on and off of the high-side synchronous rectifier switch transistor. An active control of the charging of the power supply voltage uses an auxiliary capacitor that is charged from a charge source while a power switch transistor in a first switching state. When the power switch transistor is in a second switching state that is the complement of the first switching state, the active control coupes the auxiliary capacitor to a power supply capacitor that stores the power supply voltage.

High-side synchronous rectifier driver with reduced controller power supply charging efficiency and reduced EMI

A flyback converter includes a synchronous rectifier switch transistor controlled by a controller. The controller cycles the synchronous rectifier switch transistor to lower an output voltage by transferring energy from a secondary-side output capacitor to a primary-side input capacitor.

Non-dissipative output voltage transition for an isolated switching power converter

A switching power converter is provided that adaptively changes the on-time period for an auxiliary switch transistor to locate a boundary between sufficient and insufficient energy.

Adaptive control for zero-voltage switching in a multi-switch switching power converter

A flyback converter is provided that dynamically adjusts a drain threshold voltage for a current cycle of a synchronous rectifier switch transistor based upon operating conditions in a previous cycle of the synchronous rectifier switch transistor. A differential amplifier drives a gate voltage of the synchronous rectifier switch transistor during an on-time of the current cycle so that a drain voltage of the synchronous rectifier switch transistor equals the drain threshold voltage during a regulated portion of the current cycle.

Adaptive gate regulation for a synchronous rectifier flyback converter

A system for turning off a synchronous rectifier (SR) based on a primary switch (PS) turn-on detection in a flyback converter having a primary-side and a secondary-side is disclosed. The system comprises the PS on the primary-side, the SR on the secondary-side, a spike detector, and a SR controller. The SR is configured to produce a drain-to-source voltage (V). The spike detector is in signal communication with an output capacitor (C) on the secondary-side and the spike detector is configured to detect a voltage spike of an output voltage (V) across the Cthat is indicative of the PS being turned-on. The SR controller is in signal communication with the SR and the spike detector and the SR controller is configured to turn-off the SR based on the spike detector detecting the voltage spike of the V.

System for turning off a synchronous rectifier based on a primary switch turn-on detection

An isolated switching power converter having a primary-side and secondary-side in signal communication with an input and an output is disclosed. The isolated switching power converter comprises a transformer, primary-side switch, secondary-side switch, primary-side controller, and secondary-side controller. The transformer includes a primary-winding and a secondary-winding in signal communication with the input and output. The primary-side switch is in signal communication with the primary-winding and the secondary-side switch is in signal communication with the secondary-winding. The primary-side controller is on the primary-side and the secondary-side controller is on the secondary-side. The primary-side controller is configured to output a control signal for operating the primary-side switch and the secondary-side controller configured to monitor a voltage across the secondary-side switch, output a control signal for switching the secondary-side switch, and turn-off the secondary-side switch at an off-time of the primary-side switch to transmit a data signal to the primary-side controller.

Isolated switching power converter with data communication between primary and secondary sides

A standby power system for a flyback converter is disclosed. The flyback converter includes a primary-side, a secondary-side, an output terminal at the secondary-side, and a secondary-side controller, where the output terminal is configured to electrically connect to a load. The standby power system comprises a comparator at the secondary-side, an opto-coupler in signal communication with the primary-side, the secondary-side, and the comparator, and a cable detach detector (or load detector). The cable detach detector is configured to determine whether a device is electrically connected to the flyback converter through a charging cable and to set the flyback converter into a standby mode if the deice is disconnected from the charging cable.

Power adapter having ultra low standby power

A secondary-side control loop for a flyback converter is provided that generates a secondary-side control signal during normal operation using a compensator. In periods of significant load changes, the compensator is bypassed so that the secondary-side control signal is generated as an open-loop signal.

Flyback converter with improved dynamic load response

Disclosed is a system for determining a primary switching event in an isolated converter having a primary-side and a secondary-side. The system includes a primary-switch (PS) on the primary-side, a synchronous rectifier (SR) on the secondary-side, an integration circuit, and a SR controller. The integration circuit is in signal communication with the SR on the secondary-side and the SR controller is in signal communication with the SR and the integration circuit. The SR is configured to produce a drain-to-source voltage (V) and the integration circuit is configured to integrate a difference between the Vand a output voltage (V) (produced by the secondary-side) over time to produce a Vover time value (V). The SR controller is configured to determine if the Vis greater than a first threshold voltage (V) and determine the primary switching event when the Vis greater than a second threshold voltage (VS).

System and method for determining a primary switching event in an isolated converter

A flyback converter is disclosed having a secondary side controller that generates an input current for an optocoupler diode by driving a variable resistor with a control voltage. The secondary side controller varies a variable resistance for the variable resistor to compensate for current transfer ratio gain variations for the optocoupler.

Optocoupler current transfer ratio compensation

A flyback converter is provided with a controller that is configured to analyze the reflected feedback voltage waveforms to determine the presence of a ground connection fault for the auxiliary winding.

Auxiliary winding ground fault detection for isolated DC/DC converter

A synchronous rectifier controller method is provided for controlling the on and off periods of a synchronous rectifier (SR) switch transistor in a switching power converter. The method includes a first step of monitoring an unfiltered to control whether the SR switch transistor is turned on during a first part of a power switch cycle. The method also includes a second step of monitoring a filtered SR switch signal to control whether the SR switch is turned on during a remaining second part of the power switch cycle.

Adaptive synchronous rectifier sensing deglitch

Systems, devices, and methods are provided to enable power converters to use two or more sensing elements to reliably detect a short circuit (or soft-short circuit) existing in the power converter and distinguish these conditions from other operating conditions, such as low voltage conditions or normal operating conditions. The disclosed embodiments enable the accurate detection of fault conditions, such as short circuits or soft short conditions, using a number of sensing elements, such as sense resistors and the inherent resistance of switching devices, while preventing the detection of false positives due to other factors such as low input voltage.

Growing community of inventors

Campbell, CA, United States of America

Pengju Kong