Infineon Technologies Austria Ag

Infineon Technologies Ag

Zan Wang

Wee Tar Richard Ng

Xiaowu Gong

Gerald Deboy

Yong Siang Teo

Dong Li

Jianwei Liu

Xiang Yuan

Jun Yang Luo

An apparatus comprises a controller operative to: i) monitor a resonant voltage associated with a primary winding magnetically coupled to a secondary winding; ii) control a flow of current through the primary winding to produce an output voltage at the secondary winding; and iii) control magnetization of the primary winding with respect to a detected a zero crossing event associated with the monitored resonant voltage. The controller further controls a duration of activating a switch coupled to an auxiliary winding (which is magnetically coupled to the primary winding) based on a magnitude of the monitored resonant voltage and/or a magnitude of an input voltage supplied to the primary winding. The controller operates in different modes of magnetizing the primary winding such as at peaks or valleys of the monitored resonant voltage depending on a magnitude of the input voltage.

Power generation and ZVS control in a power supply

In some examples, a controller is configured to control a primary-side switch in a power converter circuit, and the controller includes a first node configured to receive a first signal indicating a current or a voltage through a primary side of a transformer of the power converter circuit. The controller also includes a second node configured to receive a second signal indicating a current or a voltage through a primary-side switch of the power converter circuit. The controller further includes processing circuitry configured to determine a target value for the second signal based on the first signal and generate the control signal for the primary-side switch based on the target value for the second signal.

Determining a target value for a signal indicating a current or a voltage through primary-side switch based on another signal indicating a current or a voltage through an auxiliary winding on a primary side of transformer

Voltage converter controllers, voltage converters and methods are discussed regarding the adjustment of an on-time of an auxiliary switch of a voltage converter. First and second voltages are measured before a primary switch of the voltage converter is turned on and while the primary switch is turned on, and the on-time is adjusted based on the voltages.

Voltage converter controller, voltage converter and method for operating a voltage converter

In one example, a method includes activating, by a controller of a power converter, a switch of the power converter that controls an amount of energy provided by the power converter; receiving, by an input of the controller, a signal that represents an amount of current flowing through the switch; responsive to determining that the amount of current flowing through the switch is greater than or equal to a threshold amount of current, deactivating, by the controller, the switch; and responsive to determining that an amount of time elapsed since activation of the switch is greater than a threshold amount of time, deactivating, by the controller, the switch.

Power converter damage protection

A resonant converter includes first and second input terminals for applying an input voltage and first and second output terminals for providing an output voltage. A transformer includes a primary winding and a secondary winding, where both the primary winding and the secondary winding have a first and a second terminal. A series resonant circuit includes a capacitive element and the primary winding of the transformer. A switching circuit is connected between the input terminals and the series resonant circuit. A rectifier circuit is connected between the secondary winding and the output terminals. A clamping circuit is connected between one of the first and second terminals of the primary winding and the input terminals.

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Singapore, Singapore

Zan Wang