Regulated load modulation circuit and method for producing regulated load modulation signaling
First Claim
1. A load modulation circuit, comprising:
- a resonator circuit configured to resonate based on a received charging power and produce a resonance output signal based thereon;
a rectifier circuit configured to receive the resonance output signal and convert the resonance output signal to a rectified voltage signal;
a sensor circuit configured to sense the rectified voltage signal and generate a control signal based on the rectified voltage signal and a target power range associated with a change in conducting power of the load modulation circuit during a load modulation; and
a controllable current source circuit configured to generate a controlled current based on the control signal, wherein the controlled current is to modulate a load of the load modulation circuit while concurrently maintaining a change in total conducting power at an output of the rectifier circuit within the target power range, wherein the controllable current source comprises;
a first resistance having a first node coupled to an output of the rectifier circuit, and a second node;
a parallel circuit having a first branch comprising a first capacitance having a first node coupled to the second node of the first resistance, and a second node coupled to a predetermined potential, and a second branch comprising a series coupled second resistance and a switch, wherein a first node of the second resistance is coupled to the second node of the first resistance, and a node of the switch is coupled to the predetermined potential, and wherein a control terminal of the switch is coupled to the control signal.
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Accused Products
Abstract
A load modulation circuit includes a resonator circuit configured to resonate based on a received charging power and produce a resonance output signal based thereon, and a rectifier circuit configured to receive the resonance output signal and convert the resonance output signal to a rectified voltage signal. The load modulation circuit further includes a sensor circuit configured to sense the rectified voltage signal and generate a control signal based on the rectified voltage signal and a target power range associated with a change in conducting power of the load modulation circuit during a load modulation. Lastly, the load modulation circuit includes a controllable current source circuit configured to generate a controlled current based on the control signal, wherein the controlled current modulates a load of the load modulation circuit while concurrently maintaining a change in total conducting power at an output of the rectified circuit within the target power range.
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Citations
19 Claims
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1. A load modulation circuit, comprising:
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a resonator circuit configured to resonate based on a received charging power and produce a resonance output signal based thereon; a rectifier circuit configured to receive the resonance output signal and convert the resonance output signal to a rectified voltage signal; a sensor circuit configured to sense the rectified voltage signal and generate a control signal based on the rectified voltage signal and a target power range associated with a change in conducting power of the load modulation circuit during a load modulation; and a controllable current source circuit configured to generate a controlled current based on the control signal, wherein the controlled current is to modulate a load of the load modulation circuit while concurrently maintaining a change in total conducting power at an output of the rectifier circuit within the target power range, wherein the controllable current source comprises; a first resistance having a first node coupled to an output of the rectifier circuit, and a second node; a parallel circuit having a first branch comprising a first capacitance having a first node coupled to the second node of the first resistance, and a second node coupled to a predetermined potential, and a second branch comprising a series coupled second resistance and a switch, wherein a first node of the second resistance is coupled to the second node of the first resistance, and a node of the switch is coupled to the predetermined potential, and wherein a control terminal of the switch is coupled to the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for producing regulated load modulation signaling, comprising:
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sensing a received voltage at a load associated with a load modulation; determining a modulation current to satisfy a target power range based on the sensed received voltage; determining a duty cycle of a load modulation switch based on the determined modulation current; and driving the load modulation switch with the determined duty cycle. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A load modulation circuit, comprising:
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a sensor circuit configured to sense a load voltage associated with the load modulation circuit, wherein the sensor circuit is further configured to generate a control signal based on the sensed load voltage and a target power range associated with a change in conducting power of the load modulation circuit during a load modulation; and a controllable current source circuit configured to generate a controlled current based on the control signal, wherein the controlled current modulates a load of the load modulation circuit while concurrently maintaining a change in total conducting power of the load modulation circuit within the target power range, wherein the controllable current source comprises; a first resistance having a first node coupled to an input of the load modulation circuit, and a second node; a parallel circuit having a first branch comprising a first capacitance having a first node coupled to the second node of the first resistance, and a second node coupled to a predetermined potential, and a second branch comprising a series coupled second resistance and a switch, wherein a first node of the second resistance is coupled to the second node of the first resistance, and a node of the switch is coupled to the predetermined potential, and wherein a control terminal of the switch is coupled to the control signal. - View Dependent Claims (16, 17, 18, 19)
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Specification