KR102419491B1 - Power control apparatus of vehicle and method thereof - Google Patents

Abstract

The present invention relates to a vehicle power control apparatus and method, wherein a wakeup input signal according to a vehicle operation by a driver is enabled, the enabled state is maintained for a preset reference time, and the reference time After this elapses, a latch circuit unit generating a wake-up output signal that is pulled down and disabled, and a regulator unit that generates driving power as the wake-up output signal generated by the latch circuit unit is enabled , and an MCU (Micro Control Unit) configured to maintain a state in which driving power is supplied from the regulator unit for a preset wakeup time after being woken up by the driving power supplied from the regulator unit.

Description

POWER CONTROL APPARATUS OF VEHICLE AND METHOD THEREOF

The present invention relates to an apparatus and method for controlling a power supply of a vehicle, and more particularly, to an apparatus and method for controlling a power supply of a vehicle for controlling power supply during a wakeup process of a braking system of a vehicle.

In general, a hybrid vehicle, a fuel cell vehicle, or an electric vehicle is a vehicle capable of regenerative braking and implements regenerative braking using an electric booster to increase fuel efficiency.

The regenerative braking system applied to a vehicle is characterized by its characteristics, even when the vehicle is turned off, when the driver operates the vehicle for driving or braking, for example, when the vehicle door is opened or the brake pedal is depressed. In this case, power is applied and it operates to wake up.

More specifically, when there is a driver's vehicle operation, the ECU (Electronic Control Unit) applied to the regenerative braking system wakes up by receiving power. To prevent discharge, power supply to the ECU must be stopped to enter sleep mode again. In this case, the vehicle operation signal according to the driver's vehicle operation has a characteristic of maintaining the existing state when the driver's additional vehicle operation does not occur, for example, when the door is maintained in an open state, the door operation signal is continuously It is input in the state maintained at High-Level. There is a demand for a system capable of stopping power supply to the ECU even when a vehicle operation signal maintained at high-level is input in this way.

A special IC with a separate wake-up logic can be used to stop the power supply to the ECU in a situation where the vehicle operation signal maintained at high-level is input, but in this case, a cost loss occurs due to the application of the special IC this exists

Background art of the present invention is disclosed in Korean Patent Application Laid-Open No. 10-2011-0076260 (published on Jul. 6, 2011).

The present invention was devised to solve the above problems, and an object according to an aspect of the present invention is to initialize a vehicle operation signal using a predetermined latch circuit without applying a special IC to which a separate wakeup logic is applied. It is to provide an apparatus and method for controlling a power supply of a vehicle capable of performing wake-up and sleep.

In a vehicle power control apparatus according to an aspect of the present invention, in a state in which a wakeup input signal according to a driver's vehicle manipulation is enabled, the enabled state is maintained for a preset reference time, and the reference time After this elapses, a latch circuit unit generating a wake-up output signal that is pulled down and disabled, and a regulator that generates driving power as the wake-up output signal generated by the latch circuit unit is enabled and an MCU (Micro Control Unit) configured to maintain a state in which driving power is supplied from the regulator unit for a preset wakeup time after being woken up by the driving power supplied from the regulator unit. .

In the present invention, the latch circuit unit may include a main transistor connected on a main route connecting an input node to which the wake-up input signal is input and an output node to which the wake-up output signal is output.

In the present invention, the latch circuit unit includes a first pull-down transistor turned on by a current output from the main transistor, and a first pull-down transistor connected to the output node and turned on by a turn-on operation of the first pull-down transistor. It characterized in that it further comprises a two-stage pull-down transistor unit including a second pull-down transistor for pulling down the wake-up output signal.

In the present invention, the reference time is characterized in that it depends on a time when the first pull-down transistor is turned on.

In the present invention, the latch circuit unit further includes a pull-down resistor having one terminal connected to the main transistor, and a capacitor connected between the other terminal of the pull-down resistor and a ground terminal, wherein the first pull-down transistor The time when is turned on is characterized in that it is determined by the resistance of the pull-down resistor and the capacitance of the capacitor.

In the present invention, the wake-up input signal may include at least one of an ignition signal according to an ignition operation, a brake pedal signal according to a brake pedal operation, and a door opening/closing signal according to a door opening/closing operation.

In a vehicle power control method according to an aspect of the present invention, the latch circuit unit maintains an enabled state for a preset reference time in a state in which a wakeup input signal according to a driver's vehicle manipulation is enabled. generating a wake-up output signal, the regulator unit generating driving power as the wake-up output signal generated by the latch circuit unit is enabled; a micro control unit (MCU) supplied from the regulator unit Waking up by driving power, the latch circuit unit pulling down the wake-up output signal after the reference time has elapsed to disable the wake-up signal, and the MCU, a preset wake and maintaining a state in which the driving power is supplied from the regulator unit during the up time.

According to one aspect of the present invention, the present invention performs a wakeup and sleep of the system by employing a predetermined latch circuit that initializes a vehicle operation signal, thereby eliminating the application of a special IC to which a separate wakeup logic is applied. Cost can be reduced, and it can be applied to various system specifications by changing only the parameter value of the latch circuit, so it has an advantage in terms of expansion.

1 is a block diagram illustrating a vehicle power control apparatus according to an embodiment of the present invention.
2 and 3 are exemplary circuit diagrams for specifically explaining a circuit configuration of a power control apparatus for a vehicle according to an embodiment of the present invention.
4 is an exemplary diagram illustrating voltage waveforms at an input node, an output node, and an input node of a first pull-down transistor in a power control apparatus for a vehicle according to an embodiment of the present invention.
5 is a flowchart illustrating a method for controlling power of a vehicle according to an embodiment of the present invention.

Hereinafter, embodiments of a vehicle power control apparatus and method according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a block diagram for explaining a power control device for a vehicle according to an embodiment of the present invention, and FIGS. 2 and 3 are detailed diagrams of a circuit configuration of a power control device for a vehicle according to an embodiment of the present invention. It is an exemplary circuit diagram for explanation, and FIG. 4 is an exemplary diagram illustrating voltage waveforms at an input node, an output node, and an input node of the first pull-down transistor in the power control apparatus for a vehicle according to an embodiment of the present invention.

Referring to FIG. 1 , an apparatus for controlling power for a vehicle according to an embodiment of the present invention may include a latch circuit unit 100 , a regulator unit 200 , and an MCU 300 .

Briefly describing the operation of the present embodiment, the latch in a state in which a wakeup input signal according to the driver's vehicle manipulation is enabled (that is, a state in which a wakeup input signal having a high-level is input) The circuit unit 100 maintains the enabled state only for a reference time, and after the reference time elapses, generates a wake-up output signal that is disabled and transmits it to the regulator unit 200 , and the regulator unit 200 is in the enabled state As the wakeup output signal of 200) to maintain a state in which the driving power is supplied. Accordingly, a wakeup output signal is generated through the latch circuit unit 100 to wake up the MCU 300 and enter the sleep mode after the wakeup time elapses. can be removed

Hereinafter, an operation of the vehicle power control apparatus according to the present embodiment will be described in detail with reference to FIGS. 1 to 3 .

The latch circuit unit 100 maintains an enabled state for a preset reference time in a state in which a wakeup input signal according to the driver's vehicle operation is enabled, and pull-down ( A wakeup output signal that is pulled down and disabled may be generated. Here, the wakeup input signal according to the driver's vehicle operation is an ignition signal (IGN) according to an ignition operation, a brake pedal signal (BLS: Brake Light Signal) according to a brake pedal operation, and a door opening/closing signal (DO) according to a door opening/closing operation : Door Open) may be included.

A detailed circuit configuration of the latch circuit unit 100 will be described in detail with reference to FIG. 2 .

Referring to FIG. 2 , the latch circuit unit 100 is a main connecting input node (node V1 in FIG. 2 ) to which a wake-up input signal is input and an output node (node V2 in FIG. 2 ) to which a wake-up output signal is output. It may include a main transistor Q2 connected to the root, and also include a sub-transistor Q1 for turning on the main transistor Q2 by being preferentially turned on by the wake-up input signal in the enabled state. can In this embodiment, the main transistor Q2 and the sub-transistor Q1 may be implemented as a PNP Bipolar Junction Transistor (BJT) and an NPN BJT, respectively. As shown in FIG. 2 , external resistors R1 - R5 and a Zener diode D1 may be connected on a path and a branch path formed by each terminal of the main transistor Q2 and the sub transistor Q1 .

In addition, the latch circuit unit 100 is connected to the first pull-down transistor Q3 turned on by the current output from the main transistor Q2, and the output node, and is connected to the turn-on operation of the first pull-down transistor Q3. and a two-stage pull-down transistor unit Q_PD including a second pull-down transistor Q4 for pulling down the wake-up output signal by being turned on. The first pull-down transistor Q3 and the second pull-down transistor Q4 may be implemented as NPN BJTs and PNP BJTs, respectively. As shown in FIG. 2 , external resistors R6 - R8 may be connected on a path and a branch path formed by respective terminals of the first pull-down transistor Q3 and the second pull-down transistor Q4 .

In addition, the latch circuit unit 100 includes a pull-down resistor R6 having one terminal connected to the main transistor Q2 (collector of), and a capacitor connected between the other terminal of the pull-down resistor R6 and a ground terminal. C1) may be included.

When the operation of the latch circuit unit 100 is described based on the circuit configuration described above, when the wake-up input signal in the enabled state is input through the input node, the sub-transistor Q1 and the main transistor Q2 are sequentially turned on, Accordingly, the wake-up input signal of the enabled state is transmitted to the output node through the main transistor Q2 and the external resistors R1 and R8, and the wake-up state of the enable state (that is, maintained at High-Level) on the output node is generated. An up output signal is generated. The voltage level in the enabled state of the wakeup output signal is lower than that of the wakeup input signal due to a voltage drop by the external resistors R1 and R8.

Thereafter, the first pull-down transistor Q3 is turned on by the current output from the main transistor Q2 and input to the base terminal through the external resistor R6, and the first pull-down transistor Q3 is turned on The second pull-down transistor Q4 is sequentially turned on by the operation, and the wake-up output signal is pulled down and disabled by the turn-on operation of the second pull-down transistor Q4 (ie, low-level). pulled down). By pulling down the wake-up output signal through the two-stage pull-down transistor unit Q_PD including the first pull-down transistor Q3 and the second pull-down transistor Q4, only the first pull-down transistor Q3 is applied. When a single stage is applied, the problem that the wakeup output signal cannot be pulled down due to the low base current of the first pull-down transistor Q3 can be eliminated.

Here, until the first pull-down transistor Q3 is turned on, the wake-up input signal in the enabled state is transmitted to the output node through the main transistor Q2 and external resistors R1 and R8, thereby generating on the output node. The wake-up output signal is maintained in the enabled state, and since the pull-down of the wake-up output signal starts from the point in time when the first pull-down transistor Q3 is turned on, the wake-up output signal maintains the enabled state. The time, ie, the reference time, depends on the time when the first pull-down transistor Q3 is turned on.

As described above, the latch circuit unit 100 includes a pull-down resistor R6 having one terminal connected to the collector terminal of the main transistor Q2, and a capacitor connected between the other terminal of the pull-down resistor R6 and the ground terminal. (C1) may be included, and accordingly, the timing at which the first pull-down transistor Q3 is turned on is determined by the resistance of the pull-down resistor R6 and the capacitance of the capacitor C1. can That is, since some of the current output from the collector terminal of the main transistor Q2 is accumulated in the capacitor C1 through the pull-down resistor R6, the resistance of the pull-down resistor R6 and the capacitor C1 The timing at which the first pull-down transistor Q3 is turned on may be determined by the capacitance of The delay time until the first pull-down transistor Q3 is turned on becomes the reference time). Therefore, the present embodiment can be suitably applied to various ECU power system specifications through a method of changing the resistance of the pull-down resistor R6 and the capacitance of the capacitor C1, so that the extension have an advantage

Through the operation of the above-described latch circuit unit 100, the wake-up output signal that maintains the enabled state for a reference time and is pulled down and disabled after the reference time elapses is generated at the output node, and then the regulator unit 200 can be transmitted to

Meanwhile, FIG. 2 shows a circuit configuration in which an ignition signal, a brake pedal signal, and a door opening/closing signal as a wake-up input signal are input to an input node of the latch circuit unit 100, but according to an embodiment, Similarly, the brake pedal signal and the door opening/closing signal are input to the input node of the latch circuit unit 100 , and the ignition signal may be implemented in a circuit configuration in which the signal is directly input to the regulator unit 200 .

4 shows a voltage waveform at an input node (ie, a base terminal, V3) of the first pull-down transistor Q3 and a wake generated at the output node V2 when a wake-up input signal is input to the input node V1. As an exemplary diagram showing the voltage waveform of the up output signal, when the wakeup input signal maintains the enabled state for 300 ms, the resistance of the pull-down resistor (R6) and the capacitance of the capacitor (C1) are 470 kΩ and 2 μF, respectively. In the set example, the first pull-down transistor Q3 is turned on when 100 ms (ie, reference time) has elapsed from the time when the wake-up input signal is enabled, and accordingly, the wake-up output signal is pulled down and disabled can check that

The regulator unit 200 may generate driving power as the wake-up output signal generated by the latch circuit unit 100 is enabled, that is, when the wake-up output signal in the enabled state is input, the battery power is regulated ( regulation) to generate driving power of the MCU 300 and then supply it to the MCU 300 .

After being woken up by the driving power supplied from the regulator unit 200 , the micro control unit (MCU) 300 may maintain a state in which driving power is supplied from the regulator unit 200 for a preset wakeup time.

That is, after the MCU 300 is woken up by the driving power supplied from the regulator unit 200 , the voltage control signal maintained at High-Level during the wake-up time may be transmitted to the regulator unit 200 through the GPIO output. have. The regulator unit 200 may receive the wake-up output signal and the voltage control signal through the same input terminal INH, so that even if the wake-up output signal is disabled before the wake-up time elapses, it is set to High-Level. A state of supplying driving power to the MCU 300 may be maintained by receiving the maintained voltage control signal. The wakeup time may be variously designed in consideration of a designer's intention and system specifications and may be preset in the MCU 300 (eg, 10 min).

5 is a flowchart illustrating a method for controlling power of a vehicle according to an embodiment of the present invention.

Referring to FIG. 5 , a method for controlling power of a vehicle according to an embodiment of the present invention will be described. First, the latch circuit unit 100 enables a wakeup input signal according to the driver's vehicle manipulation to be enabled. In the state, a wakeup output signal that maintains the enabled state for a preset reference time is generated (S100). In detail, when the wake-up input signal in the enable state is input through the input node, the sub-transistor Q1 and the main transistor Q2 are sequentially turned on, and accordingly, the wake-up input signal in the enable state is transmitted to the main transistor ( Q2) and external resistors R1 and R8 are transmitted to the output node, and a wake-up output signal in an enabled state is generated on the output node.

As the wakeup output signal generated by the latch circuit unit 100 is enabled in step S100 , the regulator unit 200 generates driving power for waking up the MCU 300 ( S200 ).

Next, the MCU 300 is woken up by the driving power supplied from the regulator unit 200 (S300).

Next, the latch circuit unit 100 pulls down the wake-up output signal to disable it after the reference time has elapsed (S400). In detail, the first pull-down transistor Q3 is turned on by the current output from the main transistor Q2 and input to the base terminal through the external resistor R6, and the turn of the first pull-down transistor Q3 The second pull-down transistor Q4 is sequentially turned on by the on operation, and the wake-up output signal is pulled down and disabled by the turn-on operation of the second pull-down transistor Q4.

Subsequently, the MCU 300 maintains the state in which the driving power is supplied from the regulator unit 200 for a preset wake-up time (S500). That is, after the MCU 300 is woken up by the driving power supplied from the regulator unit 200 , the voltage control signal maintained at High-Level during the wake-up time is transmitted to the regulator unit 200 through the GPIO output. , to maintain the state in which the driving power is supplied to the regulator unit 200 .

As such, the present embodiment employs a predetermined latch circuit that initializes the vehicle operation signal to perform wakeup and sleep of the system, thereby eliminating the application of a special IC to which a separate wakeup logic is applied, thereby reducing the cost. In addition, it can be suitably applied to various system specifications through a method of changing only the parameter value of the latch circuit, and thus has an advantage in terms of extension.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

100: latch circuit unit
Q1: Sub-transistor
Q2: main transistor
Q_PD: pull-down transistor unit
Q3: first pull-down transistor
Q4: second pull-down transistor
R1 to R8: external resistance
R6: pull-down resistor
C1: capacitor
D1: Zener diode
200: regulator unit
300: MCU

Claims (7)

In a state in which a wakeup input signal according to the driver's vehicle operation is enabled, the enabled state is maintained for a preset reference time, and after the reference time has elapsed, it is pulled down and displayed a latch circuit unit generating a wake-up output signal that is enabled;
a regulator unit configured to generate driving power as the wake-up output signal generated by the latch circuit unit is enabled; and
an MCU (Micro Control Unit) configured to maintain a state in which driving power is supplied from the regulator unit for a preset wakeup time after being woken up by the driving power supplied from the regulator unit;
including,
The latch circuit unit includes: a main transistor connected on a main route connecting an input node to which the wake-up input signal is input and an output node to which the wake-up output signal is output; A power control device for a vehicle comprising a two-stage pull-down transistor unit.
delete According to claim 1,
The two-stage pull-down transistor unit may include a first pull-down transistor turned on by a current output from the main transistor, and a first pull-down transistor connected to the output node and turned on by a turn-on operation of the first pull-down transistor to wake up and a second pull-down transistor for pulling down the up output signal.
4. The method of claim 3,
and the reference time depends on a time when the first pull-down transistor is turned on.
5. The method of claim 4,
The latch circuit unit further includes a pull-down resistor having one terminal connected to the main transistor, and a capacitor connected between the other terminal of the pull-down resistor and a ground terminal,
A time point at which the first pull-down transistor is turned on is determined by a resistance of the pull-down resistor and a capacitance of the capacitor.
According to claim 1,
The wake-up input signal includes at least one of an ignition signal according to an ignition operation, a brake pedal signal according to a brake pedal operation, and a door opening/closing signal according to a door opening/closing operation.
generating, by the latch circuit unit, a wakeup output signal that maintains an enabled state for a preset reference time in a state in which a wakeup input signal according to a driver's vehicle manipulation is enabled;
generating, by the regulator unit, driving power as the wakeup output signal generated by the latch circuit unit is enabled;
waking up, by a micro control unit (MCU), by the driving power supplied from the regulator unit;
disabling, by the latch circuit unit, by pulling down the wake-up output signal after the reference time has elapsed; and
maintaining, by the MCU, a state in which driving power is supplied from the regulator unit for a preset wake-up time;
including,
The latch circuit unit includes: a main transistor connected on a main route connecting an input node to which the wake-up input signal is input and an output node to which the wake-up output signal is output; A vehicle power control method comprising a two-stage pull-down transistor unit.

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