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San Jose, CA, United States

Patent
Power Integrations Inc. | Date: 2015-10-06

A power converter includes a front end stage having a power factor correction controller, an output stage with a DC/DC controller, and light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the output stage. In response to the detection, the power factor correction controller in the front end stage is turned off.


An integrated circuit controller includes a switching control circuit coupled to output a drive signal to control switching of a switch to regulate an output power of a power converter to be coupled to a distribution network. An oscillator is coupled to output a clock signal coupled to be received by the switching control circuit. The switching control circuit is coupled to output the drive signal in response to the clock signal. A cable drop compensator is coupled to output a compensated reference voltage signal coupled to be received by the switching control circuit in response to a switching signal from the switching control circuit. The switching signal is representative of the drive signal. The cable drop compensator is coupled to adjust the compensated reference voltage signal proportionately to a load current to compensate for a distribution voltage across the distribution network.


Patent
Power Integrations Inc. | Date: 2015-02-17

A power conversion device includes a power switch a first main terminal coupled to a higher potential portion, a second main terminal coupled to a lower potential portion, and a tap coupled to the first main terminal to provide a current for charging a supply terminal capacitor. A controller is coupled to a control terminal of the power switch to control switching of the power switch to produce a regulated output. A supply terminal is to be coupled to a supply terminal capacitor to store a charge for supplying power to at least some of the components of the controller. A voltage regulator is coupled to regulate the charge stored and a potential on the supply terminal capacitor. The current for charging the supply terminal capacitor is selectively drawn from the tap of the power switch in response to the supply terminal capacitor being below a threshold.


A power factor correction (PFC) controller includes a driver circuit coupled to vary the switching frequency of the power switch of the PFC converter in response to an input current of a PFC converter and an input voltage of the PFC converter, and to output a third signal to switch the power switch of the PFC converter to control the input current to substantially follow the input voltage. A frequency adjust circuit is coupled to receive an error voltage signal representative of an output of the PFC converter. The frequency adjust circuit is further coupled to output an adjusted error signal to adjust the end of the off time of the power switch of the PFC converter in response to the error voltage signal.


Patent
Power Integrations Inc. | Date: 2015-12-07

A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output. An input for receiving an enable signal including enable events is responsive to the power converter output. The drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold. A current limit threshold generator is coupled to receive the enable events and vary the current limit threshold in response to the enable events of the enable signal.

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