Device for harvesting and managing wireless energy
First Claim
1. A device for harvesting and managing wireless energy comprising:
- a wireless receiver receiving a wireless radio-frequency (RF) signal and converting said wireless RF signal into an alternating-current (AC) voltage with input power;
a first rectifier, coupled to said wireless receiver, receiving said AC voltage and converting said AC voltage into a first direct-current (DC) voltage;
a first capacitor, coupled to said first rectifier and a load, receiving said first DC voltage and providing said first DC voltage for said load;
a voltage detection circuit having a first voltage value, said voltage detection circuit being coupled to said first capacitor and detecting said first DC voltage;
a first electrical switch coupled to said wireless receiver and said voltage detection circuit, said first electrical switch being initially turned off, wherein said voltage detection circuit turns on said first electrical switch responsive to input signal power of said wireless RF signal received by said wireless receiver when said first DC voltage is larger than said first voltage value;
a second rectifier coupled to said wireless receiver through said first electrical switch, and when said first DC voltage is larger than said first voltage value, said second rectifier selectively receiving said AC voltage through said first electrical switch when said first electrical switch is turned on, and converting said AC voltage into a second DC voltage to share said input power received by said first rectifier;
a third rectifier coupled to said wireless receiver through a second electrical switch for selectively converting said AC voltage into a third DC voltage to share said input power received by said first rectifier and said second rectifier; and
a second capacitor selectively coupled to said second rectifier through a third electrical switch, and said second DC voltage charging said second capacitor;
wherein the energy conversion efficiency of the device for harvesting and managing wireless energy is adaptively optimized for variations in input signal power.
1 Assignment
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Accused Products
Abstract
A device for harvesting and managing wireless energy includes a wireless receiver, a first rectifier, a first capacitor, a voltage detection circuit, a first electrical switch, a second rectifier and a second capacitor connected to each other. The wireless receiver receives a wireless RF signal and converts it into an AC voltage with an input power. The first rectifier receives the AC voltage, converts it into a first DC voltage and transmits the first DC voltage to a load. The voltage detection circuit has a threshold voltage value and detects the first DC voltage. When the first DC voltage is larger than the threshold voltage value, the voltage detection circuit turns on the first electrical switch and the second rectifier receives the AC voltage through the first electrical switch to share the input power received by the first rectifier, thereby achieving the high energy conversion efficiency.
29 Citations
10 Claims
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1. A device for harvesting and managing wireless energy comprising:
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a wireless receiver receiving a wireless radio-frequency (RF) signal and converting said wireless RF signal into an alternating-current (AC) voltage with input power; a first rectifier, coupled to said wireless receiver, receiving said AC voltage and converting said AC voltage into a first direct-current (DC) voltage; a first capacitor, coupled to said first rectifier and a load, receiving said first DC voltage and providing said first DC voltage for said load; a voltage detection circuit having a first voltage value, said voltage detection circuit being coupled to said first capacitor and detecting said first DC voltage; a first electrical switch coupled to said wireless receiver and said voltage detection circuit, said first electrical switch being initially turned off, wherein said voltage detection circuit turns on said first electrical switch responsive to input signal power of said wireless RF signal received by said wireless receiver when said first DC voltage is larger than said first voltage value; a second rectifier coupled to said wireless receiver through said first electrical switch, and when said first DC voltage is larger than said first voltage value, said second rectifier selectively receiving said AC voltage through said first electrical switch when said first electrical switch is turned on, and converting said AC voltage into a second DC voltage to share said input power received by said first rectifier; a third rectifier coupled to said wireless receiver through a second electrical switch for selectively converting said AC voltage into a third DC voltage to share said input power received by said first rectifier and said second rectifier; and a second capacitor selectively coupled to said second rectifier through a third electrical switch, and said second DC voltage charging said second capacitor; wherein the energy conversion efficiency of the device for harvesting and managing wireless energy is adaptively optimized for variations in input signal power.
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2. A device for harvesting and managing wireless energy comprising:
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a wireless receiver receiving a wireless radio-frequency (RF) signal and converting said wireless RF signal into an alternating-current (AC) voltage with input power; a first rectifier, connected with said wireless receiver, receiving said AC voltage and converting said AC voltage into a first direct-current (DC) voltage; a first capacitor, connected with said first rectifier and a load, receiving said first DC voltage and providing said first DC voltage for said load; a voltage detection circuit having a first voltage value, said voltage detection circuit being connected with said first capacitor and detecting said first DC voltage; a first electrical switch connected with said wireless receiver and said voltage detection circuit, and said first electrical switch being turned off initially, and when said first DC voltage is larger than said first voltage value, said voltage detection circuit turning on said first electrical switch; a second rectifier connected with said wireless receiver through said first electrical switch, and when said first DC voltage is larger than said first voltage value, said second rectifier receiving said AC voltage through said first electrical switch, and converting said AC voltage into a second DC voltage to share said input power received by said first rectifier; a second capacitor connected with said second rectifier, said second DC voltage charging said second capacitor; a second electrical switch connected with said wireless receiver and said voltage detection circuit, wherein said second electrical switch is turned off initially, said voltage detection circuit has a second voltage value, and said first voltage value is less than said second voltage value, and when said first DC voltage is larger than said second voltage value, said voltage detection circuit turns on said second electrical switch; and a third rectifier connected with said wireless receiver through said second electrical switch and connected with said second capacitor, wherein when said first DC voltage is larger than said second voltage value, said third rectifier receives said AC voltage through said second electrical switch and converts said AC voltage into a third DC voltage to share said input power received by said first rectifier and said second rectifier, and said third DC voltage charges said second capacitor. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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Specification