Wireless charging circuit and charging board thereof
First Claim
1. A wireless charging circuit coupled to an oscillation unit configured to generate a differential signal, said wireless charging circuit comprising:
- a balun unit coupled to said oscillation unit;
a higher-order filter unit coupled to said balun unit; and
a differential unit coupled to said higher-order filter unit and a transmission coil;
wherein said oscillation unit transmits said differential signal to said balun unit, said balun unit converts said differential signal into a converted signal to be transmitted to said higher-order filter unit, said higher-order filter unit filters said converted signal to output a filtered signal to said differential unit, and said differential unit converts said filtered signal into a differential output signal to be outputted by said transmission coil; and
wherein said balun is a center-tapped transformer having a primary side couple to said oscillation unit and a secondary side coupled to said higher-order filter unit, wherein a center tap on said primary side of said center-tapped transformer is couple to a first inductor and a first capacitor, said first inductor being coupled to a voltage source and said first capacitor.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless charging circuit coupled to an oscillation unit. The wireless charging circuit includes a balun unit, a higher-order filter unit and a differential unit. The balun unit is coupled to the oscillation unit. The higher-order filter unit is coupled to the balun unit. The differential unit is coupled to the higher-order filter unit. The differential unit is coupled to a transmission coil. The oscillation unit issues a differential signal to the balun unit, and then the balun unit converts the differential signal into a converted signal to be transmitted to the higher-order filter unit. The higher-order filter unit filters the converted signal to output a filtered signal to the differential unit. The differential unit converts the filtered signal into a differential output signal to be outputted by the transmission coil.
9 Citations
13 Claims
-
1. A wireless charging circuit coupled to an oscillation unit configured to generate a differential signal, said wireless charging circuit comprising:
-
a balun unit coupled to said oscillation unit; a higher-order filter unit coupled to said balun unit; and a differential unit coupled to said higher-order filter unit and a transmission coil; wherein said oscillation unit transmits said differential signal to said balun unit, said balun unit converts said differential signal into a converted signal to be transmitted to said higher-order filter unit, said higher-order filter unit filters said converted signal to output a filtered signal to said differential unit, and said differential unit converts said filtered signal into a differential output signal to be outputted by said transmission coil; and wherein said balun is a center-tapped transformer having a primary side couple to said oscillation unit and a secondary side coupled to said higher-order filter unit, wherein a center tap on said primary side of said center-tapped transformer is couple to a first inductor and a first capacitor, said first inductor being coupled to a voltage source and said first capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A wireless charging circuit coupled to an oscillation unit configured to generate a differential signal, said wireless charging circuit comprising:
-
a balun unit coupled to said oscillation unit; a higher-order filter unit coupled to said balun unit; and a differential unit coupled to said higher-order filter unit and a transmission coil; wherein said oscillation unit transmits said differential signal to said balun unit, said balun unit converts said differential signal into a converted signal to be transmitted to said higher-order filter unit, said higher-order filter unit filters said converted signal to output a filtered signal to said differential unit, and said differential unit converts said filtered signal into a differential output signal to be outputted by said transmission coil; and wherein said higher-order filter unit conducts higher-order attenuation and filtering on said converted signal, said higher-order filter unit comprising a plurality of band-pass filters and one or more low-pass filters, said low-pass filters being coupled between two adjacent ones of said plurality of band-pass filters, and said wireless charging circuit being configured to operate at a wireless resonant frequency within a range from 30 MHz to 1000 MHz.
-
-
13. A wireless charging circuit coupled to an oscillation unit configured to generate a differential signal, said wireless charging circuit comprising:
-
a balun unit coupled to said oscillation unit; a higher-order filter unit coupled to said balun unit; and a differential unit coupled to said higher-order filter unit and a transmission coil; wherein said oscillation unit transmits said differential signal to said balun unit, said balun unit converts said differential signal into a converted signal to be transmitted to said higher-order filter unit, said higher-order filter unit filters said converted signal to output a filtered signal to said differential unit, and said differential unit converts said filtered signal into a differential output signal to be outputted by said transmission coil; and wherein said oscillation unit comprises a first switch, a second switch, a third switch, a fourth switch and a plurality of resistors, a base of said first switch and a base of said third switch being coupled to a controller, respectively, an emitter of said first switch being coupled to a gate of said second switch, an emitter of said third switch being coupled to a gate of said fourth switch, a source of said second switch and a source of said fourth switch being coupled to the ground, respectively, a drain of said second switch and a drain of said fourth switch being coupled to said balun unit, respectively, said first switch and said third switch being bipolar junction transistors, and said third switch and said fourth switch are metal-oxide-semiconductor field-effect transistors.
-
Specification