Power supply for electrochromic mirrors in high voltage automotive power systems
First Claim
9. A vehicular electrical system, comprising:
- a power supply configured to receive power from a vehicle power source having a voltage in excess of about 24 volts, said power supply is further configured to supply power to at least one electrically operated rearview mirror element and at least one electrically powered device at a voltage less than said power source voltage, said electrical system exhibiting an electromagnetic interference level less than about 47.8 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 1000 MHz, wherein said at least one electrically powered device is selected from the group comprising;
a light-emitting diode, a break light, a center high-mounted stop lamp, a cargo light, a turn signal indicator assembly, a cellular telephone transceiver, a trainable transceiver, a user activated switch, a tire pressure monitoring system, a GPS receiver, a compass, a display, a vehicle bus interface and a light sensor.
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Accused Products
Abstract
A rearview mirror assembly is disclosed including a housing adapted to be mounted to the vehicle, a mirror disposed in the housing, at least one electrically powered device disposed in the housing, and a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 V and for supplying power at a voltage of about 5 V or less to the electrically powered device. The electrically powered device and the power supply exhibit an electromagnetic interference level of less than about 41 dBμV/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz. The mirror is preferably an electrochromic mirror, and the electrically powered device may be a control circuit for the electrochromic mirror.
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Citations
29 Claims
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9. A vehicular electrical system, comprising:
a power supply configured to receive power from a vehicle power source having a voltage in excess of about 24 volts, said power supply is further configured to supply power to at least one electrically operated rearview mirror element and at least one electrically powered device at a voltage less than said power source voltage, said electrical system exhibiting an electromagnetic interference level less than about 47.8 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 1000 MHz, wherein said at least one electrically powered device is selected from the group comprising;
a light-emitting diode, a break light, a center high-mounted stop lamp, a cargo light, a turn signal indicator assembly, a cellular telephone transceiver, a trainable transceiver, a user activated switch, a tire pressure monitoring system, a GPS receiver, a compass, a display, a vehicle bus interface and a light sensor.- View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15)
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11-1. A vehicular electrical system as in claim 9 wherein said electromagnetic interference level is less than about 28 dBμ
- V/m for emissions in the frequency range from about 119.132 MHz to about 375 MHz.
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16. A vehicular electrical system, comprising:
a power supply configured to receive power from a vehicle power source having a voltage in excess of about 24 volts, said power supply is further configured to supply power to at least one electrically operated rearview mirror element and at least one electrically powered device at a voltage less than said power source voltage, said electrical system exhibiting an electromagnetic interference level less than about 28 dBμ
V/m for narrowband emissions in the AM broadcast band.- View Dependent Claims (17, 18, 19, 20)
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21. A vehicular electrical system, comprising:
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a power supply configured to receive power from a vehicle power source having a voltage, said power supply is further configured to supply power to at least one electrically powered device at a voltage less than said power source voltage, said electrical system exhibiting an electromagnetic interference level less than about 47.8 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 1000 MHz; and
circuitry for dithering the pulse width or the switching frequency of said power supply. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification