Method and system for a battery charger
First Claim
Patent Images
1. A battery charger, comprising:
- a switch circuit configured to receive a first output voltage sense signal representative of an adapter output voltage, wherein the switch circuit is configured to generate a first enable signal and a control signal at least partially dependent on the adapter output voltage represented by the received first output voltage sense signal; and
a DC-DC voltage converter comprising an upper power transistor and a lower power transistor, wherein the upper power transistor is configured to receive the control signal;
an output filter configured to be coupled between the upper power transistor and a battery, wherein in response to the control signal, the upper power transistor is configured to provide power from the battery to a load through the output filter;
wherein the DC-DC voltage converter further includes a PWM controller and driver configured to receive the first enable signal, and wherein the DC-DC voltage converter is configured to, at least partially dependent on the first enable signal, charge the battery by controlling the upper power transistor and the lower power transistor;
wherein the PWM controller and driver comprises;
a loop selector circuit that has an output, and is configured to receive a second output voltage sense signal representative of an output voltage of the DC-DC voltage converter, an output current sense signal representative of an output current of the DC-DC voltage converter, a reference voltage signal, and a reference current signal; and
a PWM comparator coupled to the output of the loop selector signal; and
wherein the loop selector circuit comprises;
a first error amplifier having an output, and configured to receive the reference voltage signal and the second output voltage sense signal;
a second error amplifier having an output, and configured to receive the current reference signal and the output current sense signal;
a selector circuit having at least one output, and coupled to the output of the first error amplifier and the output of the second error amplifier;
a third error amplifier coupled to the at least one output of the selector circuit.
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Accused Products
Abstract
One embodiment pertains to a method including determining if external power is supplied to a power system which includes a DC-DC voltage converter; if external power is not supplied to the power system, then turn on a switching transistor in the DC-DC voltage converter and provide battery power to the load through the switching transistor; if external power is supplied to the power system, then charge a battery.
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Citations
18 Claims
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1. A battery charger, comprising:
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a switch circuit configured to receive a first output voltage sense signal representative of an adapter output voltage, wherein the switch circuit is configured to generate a first enable signal and a control signal at least partially dependent on the adapter output voltage represented by the received first output voltage sense signal; and a DC-DC voltage converter comprising an upper power transistor and a lower power transistor, wherein the upper power transistor is configured to receive the control signal; an output filter configured to be coupled between the upper power transistor and a battery, wherein in response to the control signal, the upper power transistor is configured to provide power from the battery to a load through the output filter; wherein the DC-DC voltage converter further includes a PWM controller and driver configured to receive the first enable signal, and wherein the DC-DC voltage converter is configured to, at least partially dependent on the first enable signal, charge the battery by controlling the upper power transistor and the lower power transistor; wherein the PWM controller and driver comprises;
a loop selector circuit that has an output, and is configured to receive a second output voltage sense signal representative of an output voltage of the DC-DC voltage converter, an output current sense signal representative of an output current of the DC-DC voltage converter, a reference voltage signal, and a reference current signal; and
a PWM comparator coupled to the output of the loop selector signal; andwherein the loop selector circuit comprises;
a first error amplifier having an output, and configured to receive the reference voltage signal and the second output voltage sense signal;
a second error amplifier having an output, and configured to receive the current reference signal and the output current sense signal;
a selector circuit having at least one output, and coupled to the output of the first error amplifier and the output of the second error amplifier;
a third error amplifier coupled to the at least one output of the selector circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A method, comprising:
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determining if external power is supplied to a power system which includes a DC-DC voltage converter; if external power is not supplied to the power system, then turning on a switching transistor in the DC-DC voltage converter and providing power from a battery to a load through the switching transistor; if external power is supplied to the power system, then charging the battery using the switching transistor in the DC-DC voltage converter; wherein if external power is supplied to the power system, then charging the battery further comprises; determining if the battery is charged; if the battery is charged, then disabling the DC-DC voltage converter; and if the battery is not charged then enabling the DC-DC voltage converter and charging the battery; and further comprising; measuring battery voltage and battery current; comparing the battery voltage and battery current respectively with a reference voltage and a reference current; if the difference between the battery current and the reference current is greater than the difference between the battery voltage and reference voltage, then regulate the DC-DC voltage regulator based upon the battery current and reference current; if the difference between the battery current and the reference current is less than the difference between the battery voltage and reference voltage, then regulate the DC-DC voltage regulator based upon the battery voltage and reference voltage;
determine if the battery is charged; andif the battery is not charged, continue to regulate the DC-DC voltage regulator based upon the battery voltage and reference voltage. - View Dependent Claims (7)
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8. A battery charger, comprising:
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a switch circuit configured to receive a first output voltage sense signal representative of an adapter output voltage and a second output voltage sense signal representative of a voltage of a load, wherein the switch circuit is configured to generate one or both of a first enable signal and a second enable signal at least partially dependent on at least one of the adapter output voltage and the voltage of the load as represented by the first and second output voltage sense signals, respectively;
a DC-DC voltage converter comprising an upper power transistor and a lower power transistor; and
an output filter configured to be coupled between the upper power transistor and a battery, wherein in response to one or both of the first and second enable signals, the DC-DC converter is configured to boost power from the battery to the load through the output filter using the upper power transistor;wherein the DC-DC voltage converter further includes a PWM controller and driver configured to receive the first enable signal and the second enable signal, and wherein the DC-DC voltage converter is further configured to, at least partially dependent on one or both of the first enable signal and the second enable signal, charge the battery by controlling the upper power transistor and the lower power transistor, and wherein the DC-DC voltage converter is configured to receive the second output voltage sense signal representative of the voltage of the load, and a third output voltage sense signal representative of a voltage at an output of the DC-DC voltage regulator; and wherein the PWM controller and driver comprises;
a loop selector circuit that has an output, and is configured to receive the second output voltage sense signal, the third output voltage sense signal, an output current sense signal representative of an output current of the DC-DC voltage regulator, a first reference voltage signal, a second voltage reference signal, a reference current signal, and the second enable signal; and
a PWM comparator coupled to the output of the loop selector signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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determining if external power is supplied to a power system which includes a DC-DC voltage converter; if external power is not supplied to the power system, then selecting, for the DC-DC voltage converter, a first reference voltage indicative of a desired load voltage and a feedback signal representative of the voltage at a load; enabling the DC-DC voltage converter in boost mode to power the load from a battery; determining if the battery is charged; if the battery is charged, then disabling the DC-DC voltage converter; and if the battery is not charged then enabling the DC-DC voltage converter and charging the battery, wherein enabling the DC-DC voltage converter and charging the battery further comprises; measuring battery voltage and battery current; comparing the battery voltage and battery current respectively with a second reference voltage indicative of the desired battery voltage, and a reference current; if the difference between the battery current and the reference current is greater than the difference between the battery voltage and the reference voltage, then regulate the DC-DC voltage regulator based upon the battery current and reference current; if the difference between the battery current and the reference current is less than the difference between the battery voltage and reference voltage, then regulate the DC-DC voltage regulator based upon the battery voltage and reference voltage; determining if the battery is charged; and if the battery is not charged, continuing to regulate the DC-DC voltage regulator based upon the battery voltage and reference voltage. - View Dependent Claims (17, 18)
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Specification