Apparatus and method for power distribution
First Claim
1. Apparatus to control a lithium-ion battery charging process, comprising;
- a lithium-ion battery (250);
a power controller (240);
a device controller (230);
a radio frequency (RF) power amplifier (220);
a first voltage operated switch (VOS)(274) operable to control connection between the battery (250) and device (210);
a thermal detection means (254), operably coupled to the power controller (240);
a battery feedback means (242) operable to couple the power controller (240) to a charger (260); and
the charger (260) operable to respond to the battery feedback means (242), so relating charger output to battery state, wherein the charger (260) produces a default minimum output voltage in response to a suspension in battery charging when battery temperature exceeds a threshold, characterised by;
logic circuitry (410, 420, 230, 240) operable to indicate that battery charging has been suspended;
a first switching means (442) depending from said logic circuitry operable to disconnect the negative terminal of battery (250) from ground (290) if charging has been suspended;
a second switching means (432, 434) depending from said logic circuitry operable to connect the RF power amplifier (220) to the charger (260) if charging has been suspended.
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Accused Products
Abstract
The present invention provides a circuit arrangement wherein in operation a radio frequency power amplifier is supplied by the battery when charging is progressing normally, but switches supply to the charger if the charging process is interrupted. Thus the RF power amplifier receives approximately 4.2V from the battery, or approximately 4.4V±5% from the charger if charging of the battery is suspended. This also allows operation solely from the charger in the absence of a battery. Thus the present invention enables continuing operation of the device if charging is suspended, whilst limiting the voltage level to the RF power amplifier to approximately 4.4V±5%.
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Citations
11 Claims
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1. Apparatus to control a lithium-ion battery charging process, comprising;
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a lithium-ion battery (250);
a power controller (240);
a device controller (230);
a radio frequency (RF) power amplifier (220);
a first voltage operated switch (VOS)(274) operable to control connection between the battery (250) and device (210);
a thermal detection means (254), operably coupled to the power controller (240);
a battery feedback means (242) operable to couple the power controller (240) to a charger (260); and
the charger (260) operable to respond to the battery feedback means (242), so relating charger output to battery state, wherein the charger (260) produces a default minimum output voltage in response to a suspension in battery charging when battery temperature exceeds a threshold, characterised by;
logic circuitry (410, 420, 230, 240) operable to indicate that battery charging has been suspended;
a first switching means (442) depending from said logic circuitry operable to disconnect the negative terminal of battery (250) from ground (290) if charging has been suspended;
a second switching means (432, 434) depending from said logic circuitry operable to connect the RF power amplifier (220) to the charger (260) if charging has been suspended. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a lithium-ion battery charging process, the method comprising;
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using a thermal detection means (254) to detect a threshold temperature in the battery (250);
using a power controller (240) top provide battery feedback via a battery feedback means (242) to a charger (260);
regulating the output of the charger (260) in response to the battery feedback; and
suspending charging of the battery (250) when the battery temperature exceed a threshold, characterized by;
indicating by logical operation that battery charging has been suspended;
upon suspension, regulating the charger output to maintain a default minimum output voltage;
switching, in dependence from said logical operation, of a first switching means (442) to disconnect the negative terminal of battery (250) if charging has been suspended; and
switching, in dependence from said logical operation, of a second switching means (432, 434) to connect RF power amplifier (220) to charger (260) if charging has been suspended.
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Specification