DRIVE CIRCUIT FOR AN ELECTRO-OPTIC REARVIEW MIRROR SYSTEM
First Claim
1. An electro-optic rearview mirror system comprising:
- an inside electro-optic rearview mirror element;
an outside electro-optic rearview mirror element electrically connected in series with the inside electro-optic rearview mirror element; and
a drive circuit in electrical communication with the inside electro-optic rearview mirror element and the outside electro-optic rearview mirror element and comprising a first power operational amplifier and a second power operational amplifier, both of which are configured as voltage followers, wherein the drive circuit is configured to apply overvoltage to the inside electro-optic rearview mirror element if the outside electro-optic rearview mirror element is shorted.
1 Assignment
0 Petitions
Accused Products
Abstract
An electro-optic rearview mirror system is provided. The electro-optic rearview mirror system includes an inside electro-optic rearview mirror element and an outside electro-optic rearview mirror element in series with the inside electro-optic rearview mirror element. A drive circuit is in electrical communication with the inside electro-optic rearview mirror element and the outside electro-optic rearview mirror element and includes a first power operational amplifier and a second power operational amplifier, both of which are configured as voltage followers. The drive circuit is configured to apply overvoltage to the inside electro-optic rearview mirror element if the outside electro-optic rearview mirror element is shorted.
8 Citations
20 Claims
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1. An electro-optic rearview mirror system comprising:
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an inside electro-optic rearview mirror element; an outside electro-optic rearview mirror element electrically connected in series with the inside electro-optic rearview mirror element; and a drive circuit in electrical communication with the inside electro-optic rearview mirror element and the outside electro-optic rearview mirror element and comprising a first power operational amplifier and a second power operational amplifier, both of which are configured as voltage followers, wherein the drive circuit is configured to apply overvoltage to the inside electro-optic rearview mirror element if the outside electro-optic rearview mirror element is shorted. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electro-optic rearview mirror system comprising:
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an inside electro-optic rearview mirror element; an outside electro-optic rearview mirror element in series with the inside electro-optic rearview mirror element; and a drive circuit in electrical communication with the inside electro-optic rearview mirror element and the outside electro-optic rearview mirror element, wherein the drive circuit is configured to differentially sense a voltage associated with the inside electro-optic rearview mirror element such that if the outside electro-optic rearview mirror element is shorted, a voltage associated with the inside electro-optic rearview mirror element remains substantially unchanged. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An electro-optic rearview mirror system comprising:
a drive circuit for driving an inside electro-optic rearview mirror element and at least one outside electro-optic rearview mirror element of a vehicle, the vehicle having an ambient light sensor and a glare light sensor, the drive circuit comprising; a controller responsive to outputs of the ambient light sensor and the glare light sensor for generating voltage control signals, the controller further generating a selection signal for alternatingly selecting one of the inside and outside electro-optic rearview mirror elements; a variable voltage source for generating a drive voltage; and a selection circuit coupled to the variable voltage source for receiving the drive voltage, the selection circuit also coupled to the controller for receiving the selection signal, the selection circuit further coupled to the inside electro-optic rearview mirror element and the outside electro-optic rearview mirror element for selectively supplying the drive voltage thereto in response to the selection signal. - View Dependent Claims (16, 17, 18, 19, 20)
Specification