Charge control circuit using battery voltage tracking, and a device having the same
First Claim
1. A charge control circuit, comprising:
- a charge current control circuit configured to receive an input voltage at a first node, output a sensing current to a second node, and turn on a power transistor;
a comparator configured to compare a voltage level of the second node with respect to a voltage level of a third node, wherein the third node receives a charging current from the power transistor;
a current mirror configured to generate a mirror current corresponding to the sensing current; and
an amplifier configured to receive a first feedback voltage based on the mirror current, and amplify a difference between the first feedback voltage and a reference voltage to generate a switch control signal,wherein in response to the switch control signal and a plurality of control signals, the charge current control circuit is configured to decrease the sensing current and turn on the power transistor,wherein the amplifier includes a multiplexer, a first input terminal to receive the reference, voltage, a second input terminal to receive the first feedback voltage, a third input terminal to receive a second feedback voltage, and a comparator.
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Accused Products
Abstract
A charge control circuit includes: a charge current control circuit configured to receive an input voltage at a first node, output a sensing current to a second node, and turn on a power transistor; a comparator configured to compare a voltage level of the second node with a voltage level of a third node, wherein the third node receives a charging current from the power transistor; a current mirror configured to generate a mirror current corresponding to the sensing current; and an amplifier configured to receive a first feedback voltage based on the mirror current, and amplify a difference between the first feedback voltage and a reference voltage to generate a switch control signal, wherein in response to the switch control signal and a plurality of control signals, the charge current control circuit is configured to decrease the sensing current and turn on the power transistor.
16 Citations
17 Claims
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1. A charge control circuit, comprising:
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a charge current control circuit configured to receive an input voltage at a first node, output a sensing current to a second node, and turn on a power transistor; a comparator configured to compare a voltage level of the second node with respect to a voltage level of a third node, wherein the third node receives a charging current from the power transistor; a current mirror configured to generate a mirror current corresponding to the sensing current; and an amplifier configured to receive a first feedback voltage based on the mirror current, and amplify a difference between the first feedback voltage and a reference voltage to generate a switch control signal, wherein in response to the switch control signal and a plurality of control signals, the charge current control circuit is configured to decrease the sensing current and turn on the power transistor, wherein the amplifier includes a multiplexer, a first input terminal to receive the reference, voltage, a second input terminal to receive the first feedback voltage, a third input terminal to receive a second feedback voltage, and a comparator. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11, 12, 13)
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7. A charge control circuit, comprising:
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a charge current control circuit configured to receive an input voltage at a first node, output a sensing current to a second node, and turn on a power transistor; a comparator configured to compare a voltage level of the second node with respect to a voltage level of a third node, wherein the third node receives a charging current from the power transistor; a current mirror configure to generate a mirror current corresponding to the sensing current; and an amplifier configured to receive a first feedback voltage based on the mirror current, and amplify a difference between the first feedback voltage and a reference voltage to generate a switch control signal, wherein in response to the switch control signal and a plurality of control signals, the charge current control circuit is configured to decrease the sensing current and turn on the power transistor, wherein the input voltage has a first current level, the sensing current has a second current level greater than the first current level, and the power transistor is partially turned on by the first current level of the input voltage. - View Dependent Claims (8)
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14. A charge control circuit included within a wireless power receiving device performing a wireless charging operation, comprising:
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a charge current control circuit configured to receive an input voltage at a first node directly connected to an output terminal of a rectifier circuit configured to rectify an AC signal acquired by an antenna to the input voltage, output a sensing current to a second node, and turn on a power transistor; a comparator configured to compare a voltage level of the second node with respect to a voltage level of a third node, wherein the third node receives a charging current from the power transistor; a current mirror configured to generate a mirror current corresponding to the sensing current; and an amplifier configured to receive a first feedback voltage based on the mirror current, and amplify a difference between the first feedback voltage and a reference voltage to generate a switch control signal, wherein in response to the switch control signal and a plurality of control signals, the charge current control circuit is configured to decrease the sensing current and turn on the power transistor, wherein the rectifier circuit and the antenna are included within the wireless power receiving device. - View Dependent Claims (15, 16, 17)
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Specification