CN203186118U - Automatic power-off controller - Google Patents

Abstract

The utility model discloses an automatic power-off controller which comprises a power source input connector and a power source output connector. The automatic power-off controller is characterized in that MOS switches are connected in series between the power source input connector and the power source output connector, the switch control end of each MOS switch is connected with an output base pin of a microcontroller, one input base pin of the microcontroller is connected to a diagnostic apparatus instruction input connector, and the microcontroller controls the on-off state of each MOS switch according to a system mode instruction input by the diagnostic apparatus instruction input connector. The automatic power-off controller has the advantages of being applicable to automobile power source intelligent management, achieves intelligent management of an automobile power source by means of real-time detection of the automobile system state and control of power-on and power-off of a power supply circuit, avoids the phenomenon that an automobile can not be started due to long-term over discharge, and improves the safety and the stability of a power supply system.

Description

automatic power off controller

technical field

The utility model relates to a power management device, in particular to an automatic power-off controller used for automobile power management.

Background technique

Driven by the development of automobile technology and electronic technology, more and more electronic products are applied to automobiles, thereby improving the safety, stability, comfort and entertainment of automobiles. The power supply is a major part of the car, and the battery is usually used to power the car. When the car is in the process of storage and transportation or in a long-term static state, it is necessary to interrupt the power supply to avoid battery loss and prolong the life of the battery.

Traditional power management mainly adopts mechanical operations such as manually removing the battery terminal harness or removing the power connector. The degree of intelligence is low, the operation is difficult, and it is easy to forget. If the car is left standing for a long time, the battery will be over-discharged. It cannot be started normally, causing great inconvenience to the owner.

Utility model content

In order to solve the above problems, the utility model proposes an automatic power-off controller, which is used for battery power supply management during the storage and transportation of vehicles or when they are left standing for a long time, so as to avoid the failure of starting the vehicle due to long-term over-discharge and reduce battery damage caused by over-discharge.

In order to achieve the above object, the technical scheme adopted in the utility model is as follows:

An automatic power-off controller, comprising a power input interface and a power output interface, the key of which is: a MOS switch is connected in series between the power input interface and the power output interface, and the switch control terminal of the MOS switch is connected to the micro-controller The output pin of the device is connected, and one input pin of the microcontroller is connected to the command input interface of the diagnostic instrument. The microcontroller controls the switching state of the MOS switch according to the system state command input by the command input interface of the diagnostic instrument, thereby realizing the power supply On-off control between input interface and power output interface.

As a preference, the power output interface is provided with two outputs of power output interface A and power output interface B, a first MOS switch is connected in series between the power input interface and power output interface A, and a power input interface and power output interface B are connected in series. The second MOS switch is connected in series, and the switch control ends of the first MOS switch and the second MOS switch are connected to the two output pins of the microcontroller in one-to-one correspondence.

In order to realize the normal power supply of the microcontroller, the microcontroller is provided with a power supply pin VCC and a grounding pin GND, and the power supply pin VCC is connected to the output terminal of the voltage stabilizing module, and the input terminal of the voltage stabilizing module is connected to the output terminal of the voltage stabilizing module. The power input interface is connected, and the ground pin GND is connected to the ground port.

Further, a power anti-reverse diode is connected in series between the power input interface and the input terminal of the voltage stabilizing module.

In order to implement clock management of the microcontroller, the microcontroller is provided with a clock pin CLK, which is connected to a clock circuit.

A current feedback terminal is provided on the MOS switch, and each current feedback terminal is connected to a current detection pin of the microcontroller.

The remarkable effect of the utility model is that it can be used for intelligent management of automobile power supply, connect the power supply input interface with the output end of the automobile storage battery, supply power to equipment such as automobile instruments and meters through the power supply output interface, and input the automobile working state instructions through the diagnostic instrument instruction input interface. When the car is standing still for a long time, the system is in a dormant state, the microcontroller controls the MOS switch to be disconnected, and the controlled equipment such as automotive instrumentation is in a power-off state, and the static power consumption of the microcontroller is reduced enough to avoid excessive discharge of the battery. Once the microcontroller detects an external forced wake-up command, the car is in a normal working state, the microcontroller controls the MOS switch to be turned on, and the controlled equipment such as automotive instruments and meters is powered on to resume normal work. Through real-time detection of the status of the car system and The on-off control of the power supply line realizes the intelligent management of the vehicle power supply, avoids the failure of the vehicle to start due to long-term over-discharge, and improves the safety and stability of the power supply system.

Description of drawings

Fig. 1 is the block diagram of circuit principle of the utility model.

Detailed ways

The specific embodiment and working principle of the present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, an automatic power-off controller includes a power input interface 1 and a power output interface 2. For automotive power management, the power output interface 2 is provided with two power output interfaces A and B. The first MOS switch 3 is connected in series between the power input interface 1 and the power output interface A, and the second MOS switch 3' is connected in series between the power input interface 1 and the power output interface B. The first MOS switch 3 and the The switch control end of the second MOS switch 3' is connected to the two output pins of the microcontroller 4 in one-to-one correspondence, and one input pin of the microcontroller 4 is connected to the command input interface 5 of the diagnostic instrument. The controller 4 controls the switching state of the first MOS switch 3 or/and the second MOS switch 3' according to the system state command input by the command input interface 5 of the diagnostic instrument, so as to realize the on-off between the power input interface 1 and the power output interface 2 control.

In the implementation process, the microcontroller 4 is provided with a power supply pin VCC and a grounding pin GND, and the power supply pin VCC is connected to the output terminal of the voltage stabilizing module 6, and the input terminal of the voltage stabilizing module 6 is connected to the power supply The input interface 1 is connected, and the ground pin GND is connected to the ground port 7, so as to provide working power for the microcontroller 4. In order to avoid current reversal, between the power input interface 1 and the input end of the voltage stabilizing module 6 A power anti-reverse diode 8 is connected in series between them.

In order to realize the clock input of the microcontroller 4 , the microcontroller 4 is provided with a clock pin CLK, which is connected to the clock circuit 9 .

In order to facilitate power supply state detection, a current feedback terminal is provided on the first MOS switch 3 and the second MOS switch 3', and each current feedback terminal is connected to a current detection pin of the microcontroller 4, and the microcontroller The device 4 can determine whether the power supply of the system is normal according to the current feedback of each MOS switch.

The device is applied to the automobile power management system, the power input interface 1 is connected to the power output line of the car battery, the power output interface A and the power output interface B are respectively used for EMS (Engine Manegement System) and BCM (Body Control Module). control module), audio, instrumentation, sunroof, interior lights and other systems that require a dedicated power supply.

The working principle of the utility model is:

When the vehicle is in normal use, the microcontroller 4 controls the first MOS switch 3 and the second MOS switch 3' to conduct, and the car battery provides power to systems that require duty power such as EMS, BCM, audio, instrumentation, sunroof, and interior lights.

When the vehicle is in a stationary state and the system is dormant, the microcontroller 4 can detect the dormancy command of the external device through the command input interface 5 of the diagnostic instrument, automatically enter the deep sleep state, and actively cut off the EMS, BCM, audio, instrument, sunroof, indoor The power supply of systems such as lamps keeps these systems in a power-off state, and the static power consumption of the microcontroller 4 is reduced to a low enough level, so that the power consumption of the whole vehicle is reduced to a minimum and the battery discharge is reduced.

When the vehicle is started again, the micro-controller 4 can detect the forced wake-up command of the external equipment through the command input interface 5 of the diagnostic instrument, and control the MOS switch to be turned on again, thereby automatically giving EMS, BCM, audio, instrument, sunroof, and interior light Wait for the controlled system to be powered on, and then these systems will immediately restore their inherent functions.

By adopting system state command detection and automatic control of MOS switches, the automatic and intelligent management of the car power supply is realized, which avoids the failure of the car to start due to long-term over-discharge, and improves the safety and stability of the power supply system.

Claims (6)

1. An automatic power-off controller, comprising a power input interface (1) and a power output interface (2), characterized in that: there is a serial connection between the power input interface (1) and the power output interface (2). MOS switch (3/3'), the switch control end of the MOS switch (3/3') is connected to the output pin of the microcontroller (4), and one input pin of the microcontroller (4) is connected to On the command input interface (5) of the diagnostic instrument, the microcontroller (4) controls the switching state of the MOS switch (3/3') according to the system status command input from the command input interface (5) of the diagnostic instrument, thereby realizing the power input interface ( 1) On-off control with the power output interface (2). 2. The automatic power-off controller according to claim 1, characterized in that: the power output interface (2) is provided with two outputs of power output interface A and power output interface B, and the power input interface (1) is connected to the power supply A first MOS switch (3) is connected in series between the output interfaces A, a second MOS switch (3') is connected in series between the power input interface (1) and the power output interface B, and the first MOS switch (3) and the second The switch control terminals of the two MOS switches (3') are connected to the two output pins of the microcontroller (4) in one-to-one correspondence. 3. The automatic power-off controller according to claim 1 or 2, characterized in that: the microcontroller (4) is provided with a power pin VCC and a ground pin GND, and the power pin VCC is connected to a stable The output end of the voltage stabilization module (6), the input end of the voltage stabilization module (6) is connected to the power input interface (1), and the ground pin GND is connected to the ground port (7). 4. The automatic power-off controller according to claim 3, characterized in that: a power anti-reverse diode (8) is connected in series between the power input interface (1) and the input end of the voltage stabilizing module (6) . 5. The automatic power-off controller according to claim 1 or 2, characterized in that: the microcontroller (4) is provided with a clock pin CLK, and the clock pin CLK is connected to a clock circuit (9). 6. The automatic power-off controller according to claim 1, characterized in that: the MOS switch (3/3') is provided with a current feedback terminal, and each current feedback terminal is connected to the microcontroller (4 ) connected to a current sense pin.