Alpha and Omega Semiconductor (Cayman) Ltd.

Richtek Technology Corporation

Richpower Microelectronics Corporation

Alpha Omega Semiconductor Inc.

Pei-Lun Huang

Yu-Ming Chen

Tien-Chi Lin

Jung-Pei Cheng

Chih-Yuan Liu

Tzu-Chen Lin

Yueh-Ping Yu

Yung-Chuan Hsu

Kun-Yu Lin

Xiaotian Zhang

Long-Ching Wang

Kuang-Ming Chang

Zhi-Qiang Niu

Kuang-Fu Chang

Wei-Ting Wang

Liang-Pin Tai

Yu-Chang Chen

Cheng-Hsuan Fan

Hung-Che Chou

Kuo-Chin Chiu

Li-Di Lo

Sheng-Hua Chen

Ke-Chih Chou

A charger comprises a housing, a first multi-layer printed circuit board (PCB), a second multi-layer PCB, and a third multi-layer PCB. The first PCB comprises at least a portion of a primary side circuit. The second PCB comprises at least a portion of a secondary side circuit. The third PCB is perpendicular to the first PCB and the second PCB. An isolation coupling element is disposed on the third PCB. The isolation coupling element comprises a multi-layer PCB. The first PCB comprises a high voltage (HV) semiconductor package. A surface of a die paddle of the HV semiconductor package is exposed from a molding encapsulation of the HV semiconductor package.

Super-fast transient response (STR) AC/DC converter for high power density charging application

A voltage converter comprises a second controller as a power switch of the secondary side of the transformer for comparing a detection voltage representing an output voltage and/or load current with a first reference voltage and generating a control signal, and a coupling element for transmitting the control signal generated by the second controller to the first controller on the primary side of the transformer enabling the first controller to generate a first pulse signal driving the power switch to control the on/off state of the primary side winding.

Pulse transformer

A constant on-time isolated converter comprises a transformer with a primary side and a secondary side. The primary side is connected to an electronic switch and secondary-side is connected to a load and a processor. The processor is connected to a driver on primary side through at least one coupling element and to the electronic switch. The processor receives an output voltage or an output current across the load generating a control signal accordingly. The driver receives the control signal through the coupling element and accordingly changes the ON/OFF state of the electronic switch, regulating the output voltage and the output current via the transformer, where the duration of the ON/OFF state of the electronic switch is determined between the moment control signal changes from negative to positive and the moment it changes from positive to negative to achieve a high-speed load transient response.

Constant on-time (COT) control in isolated converter

Super-fast transient response (STR) AC/DC Converter for high power density charging application

A power conversion system and a method for voltage change detection, specifically, relates to a detection circuit implemented in the AC-DC power converter, detect the voltage change. The AC input voltage is rectified to convert into a DC input voltage transmitted to a detection unit generating a detection voltage signal at different logical states corresponding to the input voltage changes. A charge current source unit is used for charging the capacitor when the detection voltage signal is in a second state and a discharge current source unit is used for discharging the capacitor when the detection voltage signal is in a first state. A primary comparator compares the voltage changes of the capacitor in the alternating charge and discharge processes with a critical zero potential and outputs a detection signal identifying the changing trend of the input voltage.

Voltage detection circuit and a method of detecting voltage changes

A constant on-time isolated converter comprising a transformer is disclosed. The transformer primary side connects to an electronic switch and secondary-side connects to a load and a processor. The processor connects to a driver on primary side through at least one coupling element and to the electronic switch. The processor receives an output voltage or an output current across the load generating a control signal. The driver receives control signal through the coupling element and accordingly changes the electronic switch ON/OFF state, regulating output voltage and current via the transformer, where the electronic switch ON/OFF duration is determined between the moment control signal changes from negative to positive and the moment it changes from positive to negative to achieve a high-speed response to load transient.

Voltage converter

The present invention discloses a constant on-time isolated converter comprising a transformer with a primary side and a secondary side. The primary side is connected to an electronic switch and secondary-side is connected to a load and a processor. The processor is connected to a driver on primary side through at least one coupling element and to the electronic switch. The processor receives an output voltage or an output current across the load generating a control signal accordingly. The driver receives the control signal through the coupling element and accordingly changes the ON/OFF state of the electronic switch, regulating the output voltage and the output current via the transformer, where the duration of the ON/OFF state of the electronic switch is determined between the moment control signal changes from negative to positive and the moment it changes from positive to negative to achieve a high-speed load transient response.

Constant on time COT control in isolated converter

An output current calculating circuit for a flyback converter operating under CCM and DCM is disclosed. The off current value Iand the blanking current value Iflowing through a sensing resistor are calculated using a detection module and are summed together using a current summing unit. A voltage converted from the sum value of the off current value Iand the blanking current value Iis transmitted through an output stage in a predetermined time ratio of a cycle with the duty cycle determined by a logic control unit, in which the logic control unit controls the output stage to receive the voltage converted from sum current in a predetermined time period of each cycle, and prevents the output stage to receive the voltage converted from sum current in the remaining time other than such predetermined time period of each cycle.

Flyback converter output current evaluation circuit and evaluation method

The present invention relates to a power supply device for voltage converter, which includes a master switch, a first controller for generating a first pulse signal to drive the master switch to be turned on and turned off, a second controller for comparing a detection voltage representing an output voltage and/or load current with a first reference voltage to determine the logic state of a control signal generated by the second controller, and a coupling element connected between the first controller and the second controller for transmitting the logic state of the control signal to the first controller and enabling the first controller to determine the logic state of the first pulse signal according to the logic state of the control signal. The second controller includes a driving module for generating a second control signal to drive a synchronous switch to be turned on and turned off.

Power supply device

A circuit and a method for evaluating a load condition in a flyback converter are disclosed. A first current source is used for providing a preset current Iequal to a sum of the off current value Iand the blanking current value Ito charge a first capacitor, and a second current source is used for providing a reference current Ito charge a second capacitor. A comparator receives a voltage applied on the first capacitor at its positive input end and a voltage applied on the second capacitor at its negative input end. The output current transmitted to the load by the flyback converter is varied to the change of the preset current I, as such the load condition is detected by the comparison result generated by the comparator.

Circuit and method for evaluation overload condition in flyback converter

The present invention relates to power conversion systems, specifically, it relates to a device for detecting the DC voltage rectified from the AC power supply voltage in an AC-DC converter, primarily used to determine whether the DC input voltage is under a brown-out level and to monitor whether the AC power supply is removed and to discharge the residue DC voltage generated in a high frequency filter capacitor, which is used to filter high frequency noise signals of the AC power supply, during the removal of the AC power.

Methods and devices for detecting the input voltage and discharging the residuevoltage

A control circuit and the control method for controlling the current voltage converter of a power conversion system in the start-up phase are disclosed. A first voltage is applied to the non-inverting input terminal of the comparator and a reference voltage is applied to the inverting input terminal of the comparator. When the first voltage exceeds the reference voltage, the comparison result from the comparator triggers the frequency of the clock signal generated by the oscillator to reduce preventing the primary current flowing through the primary winding of the transformer exceeding a pre-set value.

Growing community of inventors

Zhubei, Taiwan

Pei-Lun Huang