KR20150011283A - Mcu power control apparatus with a fail safety feature - Google Patents

Abstract

The present invention relates to an MCU power control apparatus with a fail safety function and, more specifically, to an MCU power control apparatus with a fail safety function, the MCU power control apparatus comprising a first control signal generating unit, a regulator unit, a battery power supply control unit, an IGN power supply control unit, an MCU, a logic gate, and a battery voltage monitoring unit. The MCU power control apparatus may improve driving stability and prevent the risk of an accident by providing the fail safety function for preventing the MCU from promptly stopping operation and a control function from suddenly switching into a manual mode when a battery power voltage is not normally supplied due to a failure or defect in a power supply circuit by temporarily supplying an IGN power voltage to the MCU when the battery power voltage is abnormal.

Description

{MCU POWER CONTROL APPARATUS WITH A FAIL SAFETY FEATURE}

The present invention relates to an MCU power control device having a fail safe function, and more particularly, to an MCU power control device having a fail safe function, and more particularly, To a sudden passive mode of the MCU power control device.

There are two kinds of power sources that can be supplied to the electronic equipment provided in the vehicle. One is battery power supplied from the vehicle's battery and the other is an Ignition (Ignition) power supplied when the vehicle is started. The battery power can supply the maximum power available in the vehicle, while the IGN power supply can supply only a relatively small amount of power.

Therefore, the MCU (Micro Control Unit) provided in the vehicle also receives battery power or IGN power depending on the power consumption. The MCU having relatively low power consumption uses only the IGN power, but the MCU, the motor booster system An MCU such as an MCU, a transmission MCU, or a compressor MCU uses an IGN power as an on / off signal of the MCU and a battery power as a main power of the MCU.

In case of MCU with high power consumption, it is necessary to supply battery power in order to operate the MCU. Therefore, if the supply of battery power is not smooth due to a failure or malfunction of the power supply circuit, the MCU having a large power consumption immediately stops operating, and the control function of the corresponding MCU is immediately changed to the manual mode.

Particularly, if the control function of the vehicle is changed to the manual mode for the reasons mentioned above, the instability of the vehicle operation and the risk of accidents are increased.

Related Prior Art Korean Patent Laid-Open Publication No. 2003-0013890 (published on Feb. 15, 2003, entitled " Power Supply for Automotive Electronic Control Device and Relay Driver Circuit Using Ammonia Monitoring ") is available.

In the MDPS MCU, the smart booster system MCU, the transmission MCU, the compressor MCU, etc., which have high power consumption, the MCU's immediate operation stop and control functions are prevented from suddenly changing to the manual mode The purpose of the present invention is to provide an MCU power control device with fail safe function.

The MCU power control apparatus according to an aspect of the present invention includes a first control signal generator for generating a first control signal that is enabled when an IGN voltage is at a normal level based on a voltage of an IGN power supply, A battery voltage monitoring unit for generating a battery voltage detection signal; a control unit for controlling each part of the vehicle; a second control signal, which is enabled when the voltage of the battery power source is higher than a predetermined level in response to the battery voltage sensing signal, A regulator unit that receives the battery power or the IGN power and converts the driving voltage into a driving voltage of the MCU and supplies the driving voltage to the MCU, a first control signal or a second control signal, A battery power supply control unit for transmitting the battery power to the regulator unit in response to a signal, An IGN power supply control unit for transmitting the IGN power to the regulator unit in response to the IGN power supply control unit and a logic gate for transmitting power to the regulator unit when at least one of the battery power supply control unit or the IGN power supply control unit transmits power, .

The first control signal generator may further include a diode for rectifying the IGN power supply, an LC filter circuit for removing noise from the IGN power supply, and a voltage dividing circuit for dividing the IGN power supply.

In the present invention, the battery voltage monitoring unit includes a voltage divider circuit for dividing the battery power, and is connected between the battery power supply control unit and the MCU.

In the present invention, the MCU determines whether or not the voltage of the battery power source is higher than a predetermined level based on the battery voltage sense signal. If it is determined that the voltage of the battery power source is higher than a predetermined level, And generates the enabled third control signal when it is determined that the voltage of the battery power source is less than a predetermined level.

In the present invention, the battery power supply control unit receives the first control signal from the first control signal generation unit and receives the second control signal from the MCU, wherein the source terminal is connected to the battery power supply, A first FET whose terminal is connected to the logic gate, a first pull-down device for pulling down the gate terminal of the first FET to lower the voltage to a low level when the first control signal is enabled, And a second pull-down device for pulling down the gate terminal of the first FET to lower the voltage of the gate terminal to a low level.

In the present invention, the IGN power supply control unit may include: a second FET receiving the third control signal from the MCU, the second FET having a source terminal connected to the IGN power supply, a drain terminal connected to the logic gate, And a third pull-down device for pulling down the gate terminal of the second FET and lowering the voltage of the gate terminal to a low level when the second FET is enabled.

According to the present invention, in an MCU having a large power consumption such as an MDPS MCU, a smart booster system MCU, a transmission MCU, and a compressor MCU, when an abnormality occurs in the battery power, the IGN power is temporarily supplied to the MCU, It can prevent accident risk.

1 is a block diagram of an MCU power control apparatus according to an embodiment of the present invention.
2 is a circuit diagram of a battery power supply control unit according to an embodiment of the present invention.
3 is a circuit diagram of an IGN power supply control unit according to an embodiment of the present invention.
4 is a circuit diagram of a first control signal generator according to an embodiment of the present invention.
5 is a circuit diagram of a battery voltage monitoring unit according to an embodiment of the present invention.

Hereinafter, an MCU power control apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram of an MCU power control apparatus according to an embodiment of the present invention.

1, the MCU power control apparatus includes a first control signal generating unit 300, a regulator unit 400, a battery power supply control unit 500, an IGN power supply control unit 600 ), An MCU 700, a logic gate 800, and a battery voltage monitoring unit 900.

The MCU power control apparatus can receive battery power from the battery power supply unit 100 provided separately from the vehicle and can receive the low power IGN power when the vehicle is started from the IGN power supply unit 200 provided separately in the vehicle .

The first control signal generator 300 generates a first control signal that is enabled when the IGN voltage is at the normal level, based on the voltage of the IGN power supply. The first control signal is enabled when the voltage of the supplied IGN power supply is normal when the vehicle is started. That is, the first control signal is enabled when the vehicle is started and the MCU of the vehicle starts to operate.

The MCU 700 electronically controls each part of the vehicle such as the MDPS, the smart booster, the transmission, and the compressor. In order for the MCU 700 to operate, a constant voltage, that is, a power supplied to the driving voltage is required.

The MCU 700 is supplied from the battery power source or the IGN power source unit 200 supplied from the battery power source unit 100 and transferred to the logic gate 800 through the battery power supply control unit 500 and is supplied through the IGN power supply control unit 600 The IGN power delivered to the logic gate 800 is converted into a driving voltage through the regulator unit 400 and supplied.

Since the battery power is the largest power supply that can be supplied by the vehicle and the IGN power supply is a low power power supply, the MCU 700 basically operates by the battery power, and the IGN power supply failsafe function It is temporarily supplied to provide.

In addition, the MCU 700 receives the battery voltage detection signal from the battery voltage monitoring unit 900 and receives a second control signal, which is enabled when the voltage of the battery power source is higher than a predetermined level, and a second control signal, And controls the battery power supply control unit 500 and the IGN power supply control unit 600, respectively.

The MCU 700 determines whether the voltage of the battery power source is equal to or higher than a predetermined level based on the voltage of the battery voltage sensing signal generated by the battery voltage monitoring unit 900. [

If the MCU 700 determines that the voltage of the battery power is normal to a certain level or more, the MCU 700 enables the second control signal so that the battery power supply controller 500 supplies the battery power to the logic gate 800, .

If the MCU 700 determines that the voltage of the battery power is lower than a certain level, the MCU 700 enables the third control signal so that the IGN power supply controller 500 controls the IGN power supply to the logic gate 800, .

In this case, the IGN power supply is provisionally supplied to the MCU 700. That is, when the battery power is not normally supplied, the MCU 700 is operated by the IGN power supply, so that the immediate operation stop of the MCU 700 and the sudden change of the control function of the MCU 700 to the manual mode are prevented .

The regulator unit 400 receives the battery power from the battery power unit 100 or the IGN power from the IGN power unit 200 and converts the battery power or the IGN power into the driving voltage of the MCU 700 of the vehicle, 700).

The battery power supply control unit 500 transmits the battery power supplied from the battery power supply unit 100 to the regulator unit 400 via the logic gate 800 in response to the first control signal or the second control signal.

The IGN power supply control unit 600 transmits the IGN power supplied from the IGN power supply unit 200 to the regulator unit 400 via the logic gate 800 in response to the third control signal.

The logic gate 800 is connected to the battery power supply control unit 500 and the IGN power supply control unit 600 so that when one or more of the battery power supply control unit 500 or the IGN power supply control unit 600 delivers power, To the regulator unit (400).

The battery voltage monitoring unit 900 generates a battery voltage sensing signal based on the voltage of the battery power supplied from the battery power supply controller 500 and transmits the battery voltage sensing signal to the MCU 700. The MCU 700 determines whether the voltage of the battery power is normal or higher than a predetermined level or the voltage of the battery power is lower than a predetermined level based on the battery voltage detection signal.

2 is a circuit diagram of a battery power supply control unit 500 according to an embodiment of the present invention.

The battery power supply control unit 500 according to an embodiment of the present invention may be connected between the battery power source and the regulator unit 400.

2, the battery power supply control unit 500 includes a first FET 510 having a source terminal connected to the battery power source supplied from the battery power source unit 100 and a drain terminal connected to the logic gate 800, A first pull-down device 520 for pulling down the gate terminal of the first FET to lower the voltage at the gate terminal to a low level when the first control signal is enabled, and a second pull-down device 520 for pulling down the gate terminal of the first FET 510 when sensing the second control signal. And a second pull-down device 530 for pulling down the gate terminal to lower the voltage of the gate terminal to a low level.

The battery power supply control unit 500 further includes a diode element D1 connected between the source terminal and the drain terminal of the first FET 510 and a resistance element R1 connected between the gate terminal and the source terminal of the first FET 510, And a capacitor C1 connected between the gate terminal and the drain terminal of the first FET may be provided for stabilizing the operation of the first FET 510. [

When the first control signal generator 300 enables the first control signal, the first pull-down device 520 is turned on so that the gate terminal of the first FET 510 is electrically connected to the ground. In this case, since the voltage of the gate terminal of the first FET 510 is low, the first FET 510 is turned on and the source terminal and the drain terminal of the first FET 510 are energized.

When the MCU 700 enables the second control signal, the second pull-down device 530 is turned on so that the gate terminal of the first FET 510 is electrically connected to the ground. In this case, since the voltage of the gate terminal of the first FET 510 is low, the first FET 510 is turned on and the source terminal and the drain terminal of the first FET 510 are energized.

Accordingly, when the first control signal generator 300 enables the first control signal or when the MCU 700 enables the second control signal, the battery power supplied to the source terminal of the first FET 510 is supplied to the first FET 510 To the regulator unit 400 through the logic gate 800 connected to the drain terminal of the regulator unit 400.

3 is a circuit diagram of an IGN power supply control unit 600 according to an embodiment of the present invention.

The IGN power supply control unit 600 according to an embodiment of the present invention may be connected between the IGN power supply and the regulator unit 400.

3, the IGN power supply control unit 600 includes a second FET 610 having a source terminal connected to the IGN power supply supplied from the IGN power supply unit 200 and a drain terminal connected to the logic gate 800, And a third pull-down device 620 for pulling down the gate terminal of the second FET and lowering the voltage of the gate terminal to a low level when the third control signal is sensed.

The IGN power supply control unit 600 further includes a diode element D2 connected between the source terminal and the drain terminal of the second FET 610 and a resistor element R2 connected between the gate terminal and the source terminal of the second FET 610, May be provided to stabilize the operation of the second FET 610.

When the MCU 700 enables the third control signal, the third pull-down device 620 is turned on so that the gate terminal of the second FET 610 is electrically connected to the ground. In this case, since the voltage of the gate terminal of the second FET 610 is lowered, the second FET 610 is turned on so that the source terminal and the drain terminal of the second FET 610 are energized.

When the MCU 700 enables the third control signal, the IGN power supplied to the source terminal of the second FET 610 is connected to the drain terminal of the second FET 610 through the logic gate 800, ).

4 is a circuit diagram of a first control signal generator 300 according to an embodiment of the present invention.

4, the first control signal generator 300 according to an exemplary embodiment of the present invention includes a diode element D3 for rectifying the IGN power supply, an LC filter circuit 310 for removing noise from the IGN power supply, And a first voltage dividing circuit 320 for dividing the IGN power.

The diode element D3 may be connected between the input node of the first control signal generator 300 and the LC filter circuit and the LC filter circuit 310 may be connected between the diode element D3 and the first divider circuit 320 Lt; / RTI >

The LC filter circuit 310 may include a coil L1 connected in series with the output of the diode element D3 and capacitors C2 and C3 connected between the input and output of the coil L1 and the ground.

The first voltage divider circuit 320 includes a resistor element R3 connected in series with the output of the LC filter circuit 310 and a resistor element R4 connected between the output of the resistor element R3 and the ground have.

The first control signal generator 300 receives the IGN power from the IGN power supply 200, rectifies the IGN power, removes the noise, and divides the voltage of the IGN power supply to generate the first control signal.

That is, the first control signal is a signal having a level proportional to the voltage of the IGN power supply. If the voltage division ratio of the first voltage dividing circuit 320 is a normal voltage, the level of the first control signal exceeds the threshold voltage of the first pull-down device 520 and the voltage of the IGN power supply is less than the normal voltage The level of the first control signal may be set to be less than the threshold voltage of the first pull down element 520. [

Accordingly, when the vehicle is started and the IGN power is normally supplied, the first pull-down device 520 is turned on by the first control signal generated in the first control signal unit 300, And the power is transmitted to the regulator unit 400.

5 is a circuit diagram of a battery voltage monitoring unit 900 according to an embodiment of the present invention.

The battery voltage monitoring unit 900 according to an embodiment of the present invention may be connected between the battery power supply control unit 500 and the MCU 700. [

As shown in FIG. 5, the battery voltage monitoring unit 900 may include a second voltage dividing circuit 910 for dividing the battery power.

The second voltage divider circuit 910 may include a resistance element R5 connected in series with the input node and a resistance element R6 connected between the output of the resistance element R5 and ground.

The battery voltage monitoring unit 900 divides the voltage of the battery power supplied from the battery power supply controller 500 to generate a battery voltage sensing signal.

That is, the battery voltage detection signal is a signal having a level proportional to the voltage of the polarity power supply. When the voltage of the battery voltage sensing signal is higher than a specific level, the MCU 700 determines that the voltage of the battery power source is normal to a certain level or higher. When the voltage of the battery voltage sensing signal is lower than a certain level, The partial pressure ratio of the second voltage dividing circuit 910 can be set so that the voltage is judged to be abnormal below the certain level.

Accordingly, when the voltage of the battery power source is higher than a certain level, the second control signal generated by the MCU 700 is enabled. Therefore, the second pull down device 530 is turned on, and the battery power supply control unit 500 controls the battery power (400).

If the voltage of the battery power is abnormal or less than a predetermined level, the third control signal generated by the MCU 700 is enabled. Therefore, the third pull-down device 620 is turned on to turn on the IGN power supply control unit 600, The IGN power is transmitted to the regulator unit 400.

As described above, according to the present invention, even in an MDPS MCU, a smart booster system MCU, a transmission MCU, a compressor MCU, etc. having a large power consumption, when an abnormality occurs in the battery power, the MCU temporarily supplies an IGN power, And the sudden change of the control function to the manual mode can be prevented and the power supply abnormality can be informed to the driver, so that the stability of the operation can be secured and the risk of accident can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

100: battery power unit 200: IGN power unit
300: first control signal generator 310: LC filter circuit
320: first voltage divider circuit 400: regulator section
500: battery power supply control unit 510: first FET
520: first pull down element 530: second pull down element
600: IGN power supply control unit 610: Second FET
620: Third pull-down device 700: MCU
800: Logic gate 900: Battery voltage monitoring unit
910: second voltage dividing circuit R1, R2, R3, R4, R5, R6:
D1, D2: Diode elements C1, C2, C3: Capacitors
L1: Coil

Claims (6)

A first control signal generator for generating a first control signal that is enabled when the IGN voltage is at a normal level based on the voltage of the IGN power supply;
A battery voltage monitoring unit for generating a battery voltage detection signal based on a voltage of the battery power source;
And generates a second control signal that is enabled when the voltage of the battery power source is higher than a predetermined level and a third control signal that is enabled when the voltage of the battery power source is lower than a predetermined level in response to the battery voltage sensing signal MCU;
A regulator unit which receives the battery power or the IGN power and converts the driving voltage into a driving voltage of the MCU and supplies the driving voltage to the MCU;
A battery power supply control unit for transmitting the battery power to the regulator unit in response to the first control signal or the second control signal;
An IGN power supply controller for transmitting the IGN power to the regulator in response to the third control signal; And
And a logic gate for transferring power to the regulator unit when at least one of the battery power supply control unit or the IGN power supply control unit transfers power.
The method according to claim 1,
The first control signal generator includes: a diode for rectifying the IGN power;
An LC filter circuit for removing noise from the IGN power supply; And
Further comprising a voltage divider circuit for dividing the IGN power supply.
The method according to claim 1,
The battery voltage monitoring unit
And a voltage divider circuit for dividing the battery power, and is connected between the battery power supply controller and the MCU.
The method according to claim 1,
The MCU determines whether the voltage of the battery power source is higher than a predetermined level based on the battery voltage sensing signal. When it is determined that the voltage of the battery power source is higher than a predetermined level, the MCU generates the second control signal, And generates the third control signal when the voltage of the power supply is less than a predetermined level.
The method according to claim 1,
The battery power supply control unit includes:
Receiving the first control signal from the first control signal generator and receiving the second control signal from the MCU,
A first FET having a source terminal connected to the battery power source and a drain terminal connected to the logic gate;
A first pull-down device for pulling down the gate terminal of the first FET to lower the voltage to a low level when the first control signal is enabled; And
And a second pull-down device for pulling down the gate terminal of the first FET and lowering the voltage of the gate terminal to a low level when the second control signal is enabled.
The method according to claim 1,
The IGN power supply control unit,
Receiving the third control signal from the MCU,
A second FET whose source terminal is connected to the IGN power supply and whose drain terminal is connected to the logic gate; And
And a third pull-down device for pulling down the gate terminal of the second FET to lower the voltage of the gate terminal to a low level when the third control signal is enabled.

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