Method and system for producing a supply voltage during a first and second operating mode
First Claim
1. A method for producing a supply voltage, in particular for digital circuits, in a motor vehicle from a relatively high input voltage of more than 12 volts, in particular from a vehicle power supply system voltage of 42 volts,a) in which an intermediate voltage at a level between the vehicle power supply system voltage and the supply voltage is produced from the vehicle power supply system voltage in a normal mode by means of a DC/DC converter, and b) the supply voltage is produced from the intermediate voltage by means of at least one linear regulator, wherein c) the DC/DC converter is switched off and is bridged by means of a bypass circuit in a parking mode, so that the supply voltage is produced directly by the at least one linear regulator.
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Accused Products
Abstract
The invention relates to a method for producing a supply voltage, in particular for digital circuits, in a motor vehicle from a relatively high input voltage of more than 12 volts, in particular from a vehicle power supply system voltage of 42 volts, in which an intermediate voltage at a level between the vehicle power supply system voltage and the supply voltage is produced from the vehicle power supply system voltage in a normal mode by means of a DC/DC converter (5), and the supply voltage is produced from the intermediate voltage by means of at least one linear regulator (9, 9′, 9″), in which the DC/DC converter (5) is switched off and is bridged by means of a bypass circuit (11) in a parking mode, so that the supply voltage is produced directly by the at least one linear regulator (9, 9′, 9″), and to a voltage supply circuit for this purpose.
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Citations
26 Claims
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1. A method for producing a supply voltage, in particular for digital circuits, in a motor vehicle from a relatively high input voltage of more than 12 volts, in particular from a vehicle power supply system voltage of 42 volts,
a) in which an intermediate voltage at a level between the vehicle power supply system voltage and the supply voltage is produced from the vehicle power supply system voltage in a normal mode by means of a DC/DC converter, and b) the supply voltage is produced from the intermediate voltage by means of at least one linear regulator, wherein c) the DC/DC converter is switched off and is bridged by means of a bypass circuit in a parking mode, so that the supply voltage is produced directly by the at least one linear regulator.
- 4. A voltage supply circuit having at least one linear regulator and having a DC/DC converter which is connected upstream of the at least one linear regulator, in order to produce a relatively low supply voltage, in particular for digital circuits, via an intermediate voltage from a voltage of more than 12 volts, in particular from a vehicle power supply system voltage of 42 volts, characterized in that the voltage supply circuit has a bypass circuit in order to bridge the converter in a parking mode.
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11. A method for producing a supply voltage during a first and second operation mode from a relatively high input voltage comprising the steps of:
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a) during the first operation mode;
generating an intermediate voltage at a level between the high input voltage and the supply voltage from the high input voltage in a normal mode by means of a first converter, and generating the supply voltage from the intermediate voltage by means of at least a second converter, b) during the second operation mode;
switching off the first converter and bridging the first converter by means of a bypass circuit, so that the supply voltage is produced directly by the at least one second converter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A voltage supply circuit having two operation modes comprising:
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a first converter receiving a high supply voltage generating an intermediate voltage;
a second converter receiving said intermediate voltage for generating a supply voltage;
a control circuit for either turning on said first converter or for turning off said converter and feeding said high supply voltage directly to said second converter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification