Apparatus and system for providing a power converter
An AC input power converter comprising a rectifier circuit (D 3 , D 4 , D 5 , D 6 ) for rectifying an AC input signal, a first unidirectional device (D 1 ) coupled in series with a first capacitor (C 1 ) for charging the first capacitor (C 1 ) and wherein the first unidirectional device (D 1 ) and the first capacitor (C 1 ) are arranged in parallel to an output of the rectifier circuit (D 3 , D 4 , D 5 , D 6 ), a second unidirectional device (D 2 ) coupled in series with a second capacitor (C 2 ) for charging the second capacitor (C 2 ) and wherein the second unidirectional device (D 2 ) and the second capacitor (C 2 ) are arranged in parallel to an output of the rectifier circuit (D 3, D 4 , D 5 , D 6 ), a first output (OUT 1 ) for providing a first power and a first average voltage to a first power converter, wherein the first output (OUT 1 ) s coupled to a first node between the first capacitor (C 1 ) and the first unidirectional device (D 1 ) and a second output (OUT 2 ) for providing a second power and a second average voltage to a second power converter, wherein the second output (OUT 2 ) is coupled to a second node between the second capacitor (C 2 ) and the second unidirectional device (D 2 ), wherein the first capacitor (C 1 ) has a first value and the second capacitor (C 2 ) has a second value, and wherein the first value of the first capacitor and the second value of the second capacitor are selected such that when the first power is lower than the second power, the first average voltage is larger than the second average voltage, and when the first power is larger than the second power, the first average voltage is lower than the second average voltage.
1. An AC input power converter having an operation mode and a stand-by mode, the AC input power converter comprising:
a rectifier circuit for rectifying an AC input signal;
a first unidirectional device coupled in series with a first capacitor for charging the first capacitor and wherein the first unidirectional device and the first capacitor are arranged in parallel to an output of the rectifier circuit;
a second unidirectional device coupled in series with a second capacitor for charging the second capacitor and wherein the second unidirectional device and the second capacitor are arranged in parallel to an output of the rectifier circuit;
a first output for providing a first power and a first average voltage to a first power converter, wherein the first output is coupled to a first node between the first capacitor and the first unidirectional device; and
a second output for providing a second power and a second average voltage to a second power converter, wherein the second output is coupled to a second node between the second capacitor and the second unidirectional device,
wherein the first capacitor has a first value and the second capacitor has a second value, and
wherein the first value of the first capacitor and the second value of the second capacitor are selected such that:
when the first power is lower than the second power, the first average voltage is larger than the second average voltage,
when the first power is larger than the second power, the first average voltage is lower than the second average voltage; and
wherein the first power and the first average voltage is provided to the first power converter in the operation mode and the second power and the second average voltage is provided to the second power converter in the stand-by mode.
2. The AC input power converter according to claim 1 wherein the AC input converter is in a stand-by mode wherein no power is supplied to the first output and wherein the AC input converter is a normal-operating mode wherein operating power is provided to the first output.
3. The AC input power converter according to claim 1 wherein the second value is smaller than the first value.
4. The AC input power converter according to claim 1 wherein both the first unidirectional device and the second unidirectional device comprise a diode.
5. The AC input power converter according to claim 1 wherein the power converter further comprises a controller arranged for controlling the first power converter, wherein the controller is coupled to the second power convert for receiving the second power.
6. A system comprising:
an AC input power converter according to claim 1 ,
a first power converter coupled to the first output; and
a second power converter coupled to the second output.
7. The AC input power converter according to claim 1 wherein the first unidirectional device prevents power flow from the second capacitor to the first capacitor during the operating mode.
8. The AC input power converter according to claim 1 wherein the second unidirectional device prevents power flow from the first capacitor to the second capacitor during the stand-by mode.