On-board controller stabilized voltage power supply circuit and on-board controller stabilized voltage power supply device

Abstract

The invention discloses a voltage-stabilized power supply circuit for a vehicle-mounted controller and a voltage-regulated power supply device for a vehicle-mounted controller. The power supply supplies power to the vehicle-mounted controller 5V power supply module through the regulated power supply system, wherein the regulated power supply system includes a DC / DC power supply module and a DC / DC switching frequency selection module, and the DC / DC power supply The modules are respectively connected to the power supply and the 5V power module of the vehicle controller, and the DC / DC switching frequency selection module is connected to the DC / DC power module to adjust the DC / DC switching frequency. It can ensure that the output of the 5V power module of the on-board controller reaches 5V when the voltage of the power supply drops rapidly, which meets the voltage requirements of the on-board controller for the 5V power module.

Description

technical field [0001] The application relates to a voltage-stabilized power supply technology for a low-voltage start-up power supply whose voltage drops rapidly, in particular to a voltage-stabilized power supply circuit for a vehicle-mounted controller and a voltage-stabilized power supply device for a vehicle-mounted controller in the field of the automobile industry. Background technique [0002] Most of the controllers, actuators, sensors, etc. of the vehicle system are powered by a 5V power supply, and their power supply comes directly from the vehicle battery. Due to factors such as start-stop and vehicle load overload, the battery voltage will quickly drop to about 4.5V, and the normal output of the 5V power supply cannot be guaranteed. The key parameters of the components need to be restarted, and multiple starts will increase energy consumption, and even the car ashtray phenomenon cannot be started due to multiple starts. [0003] For this reason, the solution of...

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Problems solved by technology

[0002] Most of the controllers, actuators, sensors, etc. of the vehicle system are powered by a 5V power supply, and their power supply comes directly from the vehicle battery. Due to factors such as start-stop and vehicle load overload, the battery voltage will quickly drop to about 4.5V, and the normal output of the 5V power supply cannot be guaranteed. The key parameters of the components, so that it needs to be restarted, and multiple starts will increase energy consumption, and it may even fail to start due to the phenomenon of car ashtray after multiple starts

[0003] For this reason, the solution of a kind of commonly used low-pressure starting that the prior art discloses, as figure 1 As shown, a DC / DC (switching power supply) output is added to the input end of the 5V power supply to ensure the normal working voltage of the 5V power supply module of the vehicle controller, but the DC / DC (switching power supply) DC / DC switching frequency is fixed. It is suitable for the low-start battery voltage drop slowly and the on-board controller with light load, but for its actual working conditions, that is, the battery voltage is a rapid drop process during low-voltage start, and the load of the controller is generally large when it is working. There are two deficiencies in the solution: one is that the response speed cannot keep up, and the input terminal of the 5V power module of the vehicle controller will still be lower than 5V; the other is that the solution is integrated into the vehicle controller, and the existing vehicle controller needs to be changed The structure of the power supply circuit is not conducive to widespread promotion, so the low-voltage start-up problem has not been well solved

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