Patent ID: 8134847
Filing Date: 2012-03-13
Classification: H02M,H03K,Y02B

Abstract:
1. A circuit for converting an alternating voltage into a rectified voltage, comprising: a first transistor comprising a first terminal, a second terminal, and a control terminal, the first terminal being configured to receive the alternating voltage via an input terminal, the second terminal being electrically coupled to an output terminal for outputting the rectified voltage; and a control circuit comprising a first input, a second input, and a first output, the first input being electrically coupled to the first terminal of the first transistor, the second input being electrically coupled to the second terminal of the first transistor, and the first output being electrically coupled to the control terminal of the first transistor, the first output for providing a first control signal to the first transistor; a resistive circuit between the second terminal of the first transistor and the output terminal, the control circuit comprising a third input that is electrically coupled to the output terminal, the control circuit being configured so that the first control signal is generated so that current through the resistive circuit is less than an adjustable limit value for the current during every point of time of operation; wherein the control circuit is configured to generate the first control signal based on a first voltage at the first input and based on a second voltage at the second input; and wherein the control circuit comprises a first comparator and a first cell, the first comparator comprising a first input that is electrically connected to the first terminal of the first transistor via the first input of the control circuit and a second input that is electrically connected to the second terminal of the first transistor via the second input of the control circuit; wherein the first comparator is configured to compare the first voltage at the first terminal of the transistor to the second voltage at the second terminal of the transistor; wherein the first comparator comprises an output that is electrically connected, via the first cell and the first output of the control circuit, to the control terminal of the first transistor, the output of the first comparator for providing a signal corresponding to the first control signal; and wherein the first transistor is controllable to be in an active state or an inactive state based on comparison of the first voltage and the second voltage.