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Overvoltage and backflow current protection for a battery charger
| Details |
Inventors: Felder, Matthew D.;
Assignee: Sigmatel, Inc. (Austin, TX)
Primary Examiner: Berhane; Adolf Deneke
Assistant Examiner: Grant; Robert
Attorney, Agent or Firm: Garlick, Harrison & Markison LLP, Markison; Timothy W.
An overvoltage and backflow current protection circuit is employed when charging a battery. A switching circuit controls bias to the protection circuit to switch between overvoltage protection and backflow current protection. |
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DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION The embodiments of the present invention may be practiced in a variety of settings that implement a power converter, such as a direct current-direct current (DC—DC) converter, and a battery charger.
For example, in one embodiment, a DC—DC converter unit receives power from a battery and converts the battery voltage to an output voltage, supplied to a load.
Whenever external power, such as the power provided by USB 2.
0 link, powers the load, the power is also coupled to the battery charger to charge the battery.
In this manner, the battery may be recharged from a USB 2.
0 connection or other power sources as well.
Although a variety of different devices and/or systems may be implemented, a particular system implemented on an integrated circuit is illustrated in FIG.
1.
Referring to FIG.
1, an example integrated circuit (IC) 100 is shown in which one embodiment of the invention is implemented within IC 100.
The example IC 100 is a single IC chip that implements a complete audio system.
It is to be noted that the example embodiment of FIG.
1 implements a complete audio system on a single chip, but other embodiments of the invention may incorporate one or more integrated circuit chips to provide a complete system or parts of a system.
As illustrated in FIG.
1, a variety of blocks are noted within the confines of IC 100.
The various blocks exemplify hardware components, software and interfaces resident within IC 100.
The example audio system of IC 100 may operate with one or a variety of devices, as illustrated in FIG.
1.
Accordingly, a CD (compact disc); LED (Light Emitting Diode)/LCD (Liquid Crystal Display) displays, buttons and/or switches; MMC (Multimedia Card)/SD (Secure Digital) cards; I2C peripherals; SmartMedia, Compact Flash, NOR Flash, NAND Flash, and/or hard drive devices; and memory, such as SDRAM (Synchronous Dynamic Random Access Memory) are some components that may be coupled to IC 100 through an I/O (input/output) pin multiplexer 110, as is illustrated in FIG
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Electrical and Wave 
