High efficiency power converting apparatus
An apparatus comprises a rectifier configured to convert an alternating current voltage into a direct current voltage and a high efficiency power converter comprising a first stage and a second stage connected in cascade, wherein the first stage configured to operate in various operating modes for charging a battery and the second stage configured to provide isolation between the first stage and the battery.
1. An apparatus comprising:
a rectifier configured to convert an alternating current voltage into a direct current voltage; and
a high efficiency power converter comprising a first stage and a second stage connected in cascade, wherein:
the first stage configured to operate in various operating modes for charging a battery; and
the second stage configured to provide isolation between the first stage and the battery.
2. The apparatus of claim 1 , wherein:
the first stage is a step-down power converter configured to operate in either a voltage control mode or a current control mode for charging the battery; and
the second stage is an isolation switch.
3. The apparatus of claim 1 , wherein:
the first stage is a step-down power converter configured to operate in either a voltage control mode or a current control mode for charging the battery; and
the second stage is a charge pump power converter configured to function as a voltage divider.
4. The apparatus of claim 3 , wherein:
an output voltage of the charge pump power converter is equal to one half of an input voltage of the charge pump power converter.
5. The apparatus of claim 1 , wherein:
the first stage is a four-switch buck-boost power converter configured to operate in either a voltage control mode or a current control mode for charging the battery; and
the second stage is a charge pump power converter.
6. The apparatus of claim 1 , wherein the first stage is a hybrid converter comprising:
a first switch, a capacitor and a second switch connected in series between an input voltage source and an output filter;
a third switch connected between a common node of the first switch and the capacitor, and a common node of the second switch and the output filter; and
a fourth switch connected between a common node of the capacitor and the second switch, and ground.
7. The apparatus of claim 1 , wherein:
the alternating current voltage is generated by a receiver coil configured to be magnetically coupled to a transmitter coil of a wireless power transfer system.