Voltage stabilization device, especially for use in motor vehicle, has step-up voltage converter coupled before voltage regulator to increase supplied voltage when this falls below predetermined value

摘要

The arrangement includes a voltage converter (SW) which is supplied with an on-board supply voltage (Ub) via a connection (A1). A second, step-up voltage converter (AW) is coupled before the first voltage converter, and is also supplied with the on-board supply voltage. Devices are provided, which produce a detection signal when the voltage falls below a predetermined value, to activate the step-up converter and provide a voltage (Uh) to the first converter, which is larger than the on-board supply voltage. A voltage-decoupling device is provided parallel to the second voltage converter.