US 2011/0298437 A1Published application

Switching adapter control method for adaptive mobile power systems

AssigneeDa Feng Weng

InventorsDa Feng Weng, Qi Cui Wei

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Abstract

A switching adapter control method for adaptive mobile power systems is composed of reference current generator, current mode error compensator, controllable constant turn-off timer, PWM generator and MOSFET driver. The output of the switching adapter can show constant current and voltage characteristics, that means, as the DC bus voltage is over a preset voltage, the adaptor's output characteristic is converted from a constant current source into a constant voltage source with the preset voltage. For low output capacitance case, the present invention has the ability to smoothly reduce the switching frequency of the switching adaptor and reduce the switching losses and meet Energy Star 2.0 requirements under different load conditions. And the output ripple current and voltage can be in the allowed range.

Claims6

Dependent claims

The switching adapter control method for adaptive mobile power systems is composed of reference current generator, current mode error compensator, controllable constant turn-off timer, PWM generator and MOSFET driver;

According to the detected output voltage Vo and preset the output voltage Vref, the reference current generator generates the corresponding reference current;
The current mode error compensator is used to amplify and compensate the error between the detected output current and the reference current from the reference current generator to output the control signal for the PWM generator;
The PWM generator outputs PWM turn-on control signal based on the output of the current mode error compensator;
Based on the output of the reference current generator, the controllable constant turn-off timer outputs the related turn-off time to make the PWM generator output the turn-off control signal and make the power switch turn off for the turn-off time;
Based on the output of the PWM generator, the MOSFET driver is used to driver the power switch, MOSFET turn-on or off.

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Dependencies are inferred from the claim text.