Power supply for electrochromic mirrors in high voltage automotive power systems
First Claim
1. A rearview mirror assembly for a vehicle comprising:
- a housing adapted to be mounted to the vehicle;
an electrochromic mirror disposed in said housing;
a control circuit for controlling the electrochromic mirror; and
a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 V and supplying power at a voltage of about 5 V or less to said control circuit, said control circuit and said power supply exhibiting an electromagnetic interference level less than about 41 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.
1 Assignment
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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
50 Claims
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1. A rearview mirror assembly for a vehicle comprising:
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a housing adapted to be mounted to the vehicle;
an electrochromic mirror disposed in said housing;
a control circuit for controlling the electrochromic mirror; and
a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 V and supplying power at a voltage of about 5 V or less to said control circuit, said control circuit and said power supply exhibiting an electromagnetic interference level less than about 41 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for providing power to an electrochromic rearview mirror assembly from a vehicle power source having a voltage in excess of about 24 volts while producing an electromagnetic interference level less than about 41 dBμ
- V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz, the method comprising;
(a) providing a switched power supply to convert the voltage of the power received from the vehicle power source to about 5 volts or less;
(b) dithering of the frequency of the power supplied from the power supply; and
(c) supplying the power to the electrochromic rearview mirror assembly. - View Dependent Claims (13)
- V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz, the method comprising;
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14. An electrical control system for an electrochromic mirror of a vehicle comprising:
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a linear pre-regulator circuit coupled to a vehicle power source for reducing transients in the power received from the vehicle power source;
a switched power supply coupled to an output of said linear pre-regulator circuit for reducing the voltage of the power supplied from the vehicle power source; and
a control circuit coupled to said switched power supply to receive the reduced voltage power output from said switched power supply, said control circuit controls the reflectance of the electrochromic mirror by varying the voltage applied to the electrochromic mirror; and
circuitry for dithering the pulse width or the switching frequency of said power supply. - View Dependent Claims (15, 16, 17)
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18. An electrical control system for an electrochromic mirror of a vehicle comprising:
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a linear pre-regulator circuit coupled to a vehicle power source for reducing transients in the power received from the vehicle power source;
a switched power supply coupled to an output of said linear pre-regulator circuit for reducing the voltage of the power supplied from the vehicle power source; and
a control circuit coupled to said switched power supply to receive the reduced voltage power output from said switched power supply, said control circuit controls the reflectance of the electrochromic mirror by varying the voltage applied to the electrochromic mirror, wherein said control circuit and said switched power supply exhibit an electromagnetic interference level less than about 41 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.- View Dependent Claims (19)
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20. A rearview mirror assembly for a vehicle comprising:
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a housing adapted to be mounted to the vehicle;
a mirror disposed in said housing;
at least one electrically powered device disposed in said housing; and
a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 volts and supplying power at a voltage of about 5 volts or less to said electrically powered device, said electrically powered device and said power supply exhibiting an electromagnetic interference level less than about 41 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.- View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An electrically powered vehicle component comprising:
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at least one electrically powered device; and
a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 volts and supplying power at a voltage of about 5 volts or less to said electrically powered device, said electrically powered device and said power supply exhibiting an electromagnetic interference level less than about 41 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.- View Dependent Claims (35, 36, 37, 38, 39)
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40. A lighting fixture for a vehicle comprising:
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at least one light-emitting diode;
a switching current source for receiving power from a vehicle power source having a voltage in excess of about 24 volts and supplying power at a voltage of about 5 volts or less to said light emitting diode; and
a circuit for dithering the pulse width or the switching frequency of said switching current source.
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41. A rearview mirror assembly for a vehicle comprising:
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a housing adapted to be mounted to the vehicle;
a mirror disposed in said housing;
at least one electrically powered device disposed in said housing; and
a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 V and supplying power at a voltage of about 5 V or less to said electrically powered device, wherein said electrically powered device and said power supply exhibit an electromagnetic interference level less than about 41 dBμ
V/m for emissions in the frequency range from about 0.4 MHz to about 20 MHz.- View Dependent Claims (42, 43, 44, 45, 46, 47, 49, 50)
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48. A rearview mirror assembly for a vehicle comprising:
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a housing adapted to be mounted to the vehicle;
a mirror disposed in said housing;
at least one electrically powered device disposed in said housing; and
a power supply for receiving power from a vehicle power source having a voltage in excess of about 24 V and supplying power at a voltage of about 5 V or less to said electrically powered device;
wherein said at least one electrically powered device includes a GPS receiver disposed in said housing.
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Specification