Ldo free wireless power receiver having rectifier

A wireless power reception system, comprising:

• a bridge rectifier arrangement of transistors receiving an input time varying power signal and being coupled between ground and an output node;
• wherein the bridge rectifier arrangement of transistors comprises:
• a first transistor and a first companion transistor coupled in parallel between the output node and a first node, wherein a gate of the first transistor is coupled to receive a first gate voltage and a gate of the first companion transistor is coupled to receive a first companion gate voltage;
• a fourth transistor and a fourth companion transistor coupled in parallel between the first node and ground, wherein a gate of the fourth transistor is coupled to receive a fourth gate voltage and a gate of the fourth companion transistor is coupled to receive a fourth companion gate voltage;
• a third transistor and a third companion transistor coupled in parallel between the output node and a second node, wherein a gate of the third transistor is coupled to receive a third gate voltage and a gate of the third companion transistor is coupled to receive a third companion gate voltage;
• a second transistor and a second companion transistor coupled in parallel between the second node and ground, wherein a gate of the second transistor is coupled to receive a second gate voltage and a gate of the second companion transistor is coupled to receive a second companion gate voltage;
• a feedback device receiving input from the output node and generating a feedback signal therefrom;
• control circuit coupled to receive the input time varying power signal and the feedback signal, and generating gate voltages for the transistors of the bridge rectifier arrangement to cause:
• turn on of the first transistor, first companion transistor, second transistor, and second companion transistor during a first phase, and turn on of the third transistor, third companion transistor, fourth transistor, and fourth companion transistor during a second phase, to thereby cause rectification of the input time varying power signal to produce an output voltage at the output node;
• and
• turn off of at least one of the first transistor and the second transistor prior to an end of the first phase, and turn off of at least one of the third transistor and the fourth transistor prior to an end of the second phase, to thereby cause dissipation of excess power delivered by the input time varying power signal.

A wireless power reception system, comprising:

• a bridge rectifier arrangement of transistors receiving an input time varying power signal and being coupled between ground and an output node;
• a feedback device receiving input from the output node and generating a feedback signal therefrom;
• control circuit coupled to receive the input time varying power signal and the feedback signal, and generating gate voltages for the transistors of the bridge rectifier arrangement based upon the input time varying power signal and the feedback signal to cause:
• turn on of two transistors of the bridge rectifier arrangement during a first phase, and turn on of two other transistors of the bridge rectifier arrangement during a second phase, to thereby cause rectification of the input time varying power signal to produce an output voltage at the output node;
• and
• modulation of a gate voltage of at least one transistor of the bridge rectifier arrangement during the first phase, and modulation of a gate voltage of at least one other transistor of the bridge rectifier arrangement during the second phase, to thereby cause dissipation of excess power delivered by the input time varying power signal.
• wherein, based upon operating conditions of the wireless power reception, the control circuit operates the bridge rectifier arrangement in an in-phase serial configuration and/or operates the bridge rectifier arrangement in an anti-phase parallel configuration.