Power receiver for wireless charging system
First Claim
1. A power receiver for a wireless power transmission system, the power receiver comprising:
- input circuitry that converts power transmitted wirelessly from a power transmitter into an input signal; and
a regulator, connected to the input circuitry, that regulates the input signal to generate a regulated output signal based on a current reference signal and a voltage reference signal, wherein;
the output signal is applied to a load; and
the regulator controls at least one of the current reference signal and the voltage reference signal to control power loss within the power receiver;
the regulator (i) senses output voltage level and output current level of the output signal, (ii) generates the regulated output signal based on the sensed output voltage level and the sensed output current level, and (iii) adjusts the current reference signal to control the power loss within the receiver;
the regulator comprises;
a power transistor having a control node, an input node that receives the input signal, and an output node that provides the output signal; and
control circuitry that controls a voltage level at the control node of the power transistor based on the voltage reference signal, the sensed output voltage level, the current reference signal, and the sensed output current level;
the control circuitry comprises;
voltage-based control circuitry that controls the voltage level at the control node of the power transistor based on a comparison of the voltage reference signal and the sensed output voltage; and
current-based control circuitry that controls the voltage level at the control node of the power transistor based on a comparison of the current reference signal and the sensed output current level;
the voltage-based control circuitry comprises;
a differential amplifier connected to receive the voltage reference signal and the sensed output voltage level; and
a first control transistor having a control node connected to an output of the differential amplifier, and an output node connected to the control node of the power transistor; and
the current-based control circuitry comprises;
a first operational amplifier (opamp) connected to receive the current reference signal and the sensed output current level; and
a second control transistor having a control node connected to an output of the first opamp, and an output node connected to the control node of the power transistor.
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Abstract
A power receiver for a wireless power transmission system that includes a power transmitter has input circuitry that converts power received from the power transmitter into an input signal. A regulator regulates the input signal to generate a regulated output signal based on a current reference signal and a voltage reference signal, and a load receives the regulated output signal. The regulator controls at least one of the current reference signal and the voltage reference signal to control power loss within the regulator. In one embodiment, the regulator globally controls the voltage of the rectified input signal and locally controls the current reference signal to limit power loss in the regulator as well as meet system load requirements.
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Citations
7 Claims
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1. A power receiver for a wireless power transmission system, the power receiver comprising:
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input circuitry that converts power transmitted wirelessly from a power transmitter into an input signal; and a regulator, connected to the input circuitry, that regulates the input signal to generate a regulated output signal based on a current reference signal and a voltage reference signal, wherein; the output signal is applied to a load; and the regulator controls at least one of the current reference signal and the voltage reference signal to control power loss within the power receiver; the regulator (i) senses output voltage level and output current level of the output signal, (ii) generates the regulated output signal based on the sensed output voltage level and the sensed output current level, and (iii) adjusts the current reference signal to control the power loss within the receiver; the regulator comprises; a power transistor having a control node, an input node that receives the input signal, and an output node that provides the output signal; and control circuitry that controls a voltage level at the control node of the power transistor based on the voltage reference signal, the sensed output voltage level, the current reference signal, and the sensed output current level; the control circuitry comprises; voltage-based control circuitry that controls the voltage level at the control node of the power transistor based on a comparison of the voltage reference signal and the sensed output voltage; and current-based control circuitry that controls the voltage level at the control node of the power transistor based on a comparison of the current reference signal and the sensed output current level; the voltage-based control circuitry comprises; a differential amplifier connected to receive the voltage reference signal and the sensed output voltage level; and a first control transistor having a control node connected to an output of the differential amplifier, and an output node connected to the control node of the power transistor; and the current-based control circuitry comprises; a first operational amplifier (opamp) connected to receive the current reference signal and the sensed output current level; and a second control transistor having a control node connected to an output of the first opamp, and an output node connected to the control node of the power transistor. - View Dependent Claims (2, 3, 4)
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5. A method for a power receiver receiving power transmitted wirelessly from a power transmitter to control power loss, the method comprising:
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the power receiver globally controlling a voltage level of an input signal within the power receiver to regulate a voltage level of an output signal applied by the power receiver to a load; and the power receiver locally controlling at least one of a current reference signal and a voltage reference signal to control the power loss within the power receiver, wherein; the power receiver determines present power loss within the power receiver based on the voltage level of the input signal, the voltage level of the output signal, and the current level of the output signal; if the power receiver determines that the present power loss is greater than a predetermined maximum value, then the power receiver decreases the current reference signal from an initial current reference level until the power receiver determines that the present power loss is not greater than the predetermined maximum value; after decreasing the current reference signal, the power receiver transmits a request to the power transmitter to decrease its transmit power level to decrease the voltage level of the input signal. - View Dependent Claims (6, 7)
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Specification