Car power supply system with pressure-boosting function

Abstract

Provided is a car power supply system with a pressure-boosting function. The car power supply system comprises a storage battery, a protection circuit, a primary high-voltage-reduction converter, and a secondary low-voltage-reduction converter. Voltage outputted by the protection circuit is inputted to a front-end voltage-boosting circuit of the primary high-voltage-reduction converter. The protection circuit is connected to an output end of the storage battery. The secondary low-voltage-reduction converter is connected to the primary high-voltage-reduction converter. The primary high-voltage-reduction converter comprises a first LDO voltage-stabilizing module, a second voltage-stabilizing module and a third voltage-stabilizing module. The car power supply system with the pressure-boosting function has following beneficial effects: the front-end voltage-boosting circuit is additionally arranged on the primary high-voltage-reduction converter; with the reduction of battery voltage, stable input voltage is supplied to the primary high-voltage-reduction converter such that a follow-up circuit and a downstream system supply electricity; a secondary low-voltage-reduction circuit is capable of adapting output voltage of the primary high-voltage-reduction converter to multiple different kinds of voltage output so that the car power supply system is high in generality.

Description

technical field [0001] The invention relates to the field of automobile power supply, in particular to an automobile power supply system with boost function. Background technique [0002] Today, car users are becoming more and more sensitive to fuel consumption and expect to save money on fuel consumption while objectively helping to reduce their impact on the environment. In order to cope with this trend, automakers have adopted various ways to reduce consumption. One of the ways is to apply automatic "Start / Stop" (Start / Stop) function in new models to help reduce fuel consumption while also reducing consumption. Increase selling points. [0003] The so-called automatic start-stop function means that when the car stops due to traffic jam or waiting for a red light, these innovative systems automatically shut down the engine (turn off); and when the driver's foot moves from the brake pedal to the accelerator pedal, it automatically restarts the engine (ignition). This hel...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned system can reduce fuel consumption, its power supply has relatively large limitations: the power supply system in the automobile in the prior art generally consists of accumulators connected in sequence, a protection circuit to prevent reverse connection of the circuit, and the output voltage of the accumulator is stabilized at Primary high-voltage buck converter with 5V output, secondary low-voltage buck converter that further reduces the output of the primary high-voltage buck converter to stabilize at 3.8, 2.2, 1.2 volts, or other voltages below 5V, when the engine restarts , the battery voltage may drop to 6.0V or even lower

However, many downstream modules still require 5V power supply, and the low voltage difference makes the primary high-voltage buck converter not have enough margin to work normally.

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