KR20140078858A - Apparatus and method for improving output voltage response of boost converter power - Google Patents

Abstract

The objective of the present invention is to provide a device and a method for improving a quick response of an output voltage of boost converter power for an eco-friendly vehicle, capable of reducing an initial starting time of a controller, and improving durability of a boost output end element by interworking the output voltage of the boost converter power with power of an auxiliary battery for a quick response. To achieve the objective, the device for improving a quick response of an output voltage of boost converter power comprises: a comparator to receive a boost output voltage measuring value of V_boost_ref and a VCC voltage measuring value of Vref, and determine an output signal depending on the comparing result; an end gate to input the output signal of the comparator and a control signal of a CPU, and determine an output signal; a power insertion switch which is on/off operated according to the signals inputted by the end gate, and connect or block the power of the auxiliary power to a boost output end.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boost converter for a vehicle,

[0001] The present invention relates to an apparatus and method for boosting a boost converter power output voltage for an environment vehicle, and more particularly, to a boost converter for boosting an output voltage of a boost converter by selectively applying an auxiliary battery power to an output voltage of a boost converter power supply, And more particularly, to an apparatus and method for boosting power supply output voltage of a boost converter for an environmental vehicle that can shorten start-up time and increase endurance characteristics of a boost converter power output stage device.

Generally, the environmental vehicle controller uses a boost converter power to raise the signal / noise ratio in order to increase the signal integrity from the noise introduced from the high voltage. In addition, a control power source In addition, the power of the boost converter is used to drive the resolver, sensor, and OP-Amp that are responsible for the remaining signal blocks.

The boost converter has a structure in which the magnitude of the diode current increases in inverse proportion to the input power supply voltage and its stabilization time is much longer than the stabilization time of the control power supply so that the function unique to the controller such as the sensor failure detection function (Hereinafter referred to as a boost output voltage) stabilization time without waiting for the stabilization time of the boost converter power supply.

The boost converter power supply used in the environmental vehicle controller is designed to suppress the sudden voltage / current fluctuation of the boost converter power output stage (hereinafter, referred to as 'boost output stage') due to the variation of the auxiliary battery voltage (B + In buck converter and when the output voltage of the buck converter is low (that is, when the input voltage of the boost converter power supply is low) due to the characteristic of the boost converter having a high output voltage to the input voltage, So that the diode and the capacitor of the boost output stage are subjected to a very large stress.

In the past, the design of the boost converter power supply was designed by using the special / high cost capacitor at the output stage and the output diode current specification against the rated load.

In addition, in order to suppress the boost converter current of the initial inrush current type, a method of delaying the output voltage rising slope such as soft start is applied. In this case, after the normal operation of the CPU, the boost output voltage is in a standby state The detection of the failure of the initial sensor, which is a function inherent to the controller, is delayed and adversely affects the responsiveness of the controller.

In order to solve the above problems, there have been various studies. However, in order to solve the above problems, there has been a problem in that a circuit for designing, circuit designing, cost increase due to use of high precision device, Causing problems.

1 is a diagram showing a boost converter power supply circuit structure of a controller for a conventional environment vehicle.

As shown in FIG. 1, the controller for the environment vehicle receives the auxiliary battery power from the instant when the IG signal is input, and operates the buck power supply and the power supply units in the regulator IC 1 for the control power supply. From the moment when the VCC power source reaches the output voltage target, the CPU 3 starts its operation through an initialization process such as resetting. From the instant when the output of the buck power source rises, the boost converter IC 2 is driven by receiving the voltage. The boost output voltage supplies power to OP-Amp and the like in various sensors such as a resolver sensor and the like, and the CPU 3 waits for the functional operation of the sensors and the circuit blocks until the boost output voltage stabilizes.

Normally, the boost output voltage is higher than the voltage of the auxiliary battery power supply, and the time to reach the target voltage is very long, which is several tens times higher than the rise time of the VCC power supply.

FIG. 2 shows a sequence of IG ON / OFF of the conventional boost converter power supply, which shows a sequence in which the CPU is activated after the initialization of the VCC output voltage, and then the controller operation is performed.

1, the boost output voltage is determined as a 'boost input voltage / (1-duty ratio)'. In a period in which the buck power output rises (in a low boost input voltage range) Energy is charged into the boost input stage inductor L1 while the switch S of the boost converter IC 2 is turned on and energy is rapidly supplied to the output stage as soon as the switch S is turned off. The diode current Id rises sharply from the instant that IG is turned on and flows into the diode (D) and the capacitor (C1) in the form of inrush current. As a result, diodes and capacitors of the boost output stage have current specifications And it is designed using a high-cost element or the like. The boost converter IC 2 measures the boost output voltage measurement value V_boost_ref according to the resistance value ratio between the first resistor R1 and the second resistor R2 and selects and determines the duty ratio until the target voltage is reached The switch S is driven.

As shown in FIG. 2, the CPU waits for diagnosis and signal processing of various sensors connected to the boost output terminal during the period A, which is the time when the boost output voltage is stabilized, thereby deteriorating the quick maneuverability of the controller. Also, if the slope of the boost output voltage is formed gently to limit the magnitude of the output current of the boost converter power supply when the IG is ON, the actual startup time of the controller is further delayed, such as the time of the section B relative to the time of the section A. The boost converter power supply operates in a steady state after the C section relative to the diode current (Id) of the initial IG ON state, and the rated current becomes very low after the C section.

Therefore, the current and capacity optimization of the boost output stage device becomes structurally impossible due to the magnitude of the diode current Id that rapidly changes during IG ON and OFF.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and it is an object of the present invention to provide a boost converter capable of shortening the initial startup time of the controller and improving the durability of the boost output stage device by accelerating the output voltage of the boost converter power supply, And more particularly, to an apparatus and method for boosting power output voltage of a vehicle boost converter.

In order to achieve the above object, the present invention provides a boost converter for boosting output voltage of a boost converter, comprising: a comparator for receiving a boost output voltage measurement value V_boost_ref and a VCC voltage measurement value Vref and determining an output signal according to the comparison result; An end gate for receiving the output signal of the comparator and the control signal of the CPU to determine an output signal; And a power-on switch that is turned on / off according to a signal input from the end gate to connect or disconnect the auxiliary battery power to the boost output terminal. to provide.

Further, the present invention provides a method of controlling a boost converter, comprising: a step of outputting a boost output voltage by operating a boost converter IC when IG is ON; Comparing the VCC voltage measurement value Vref and the boost output voltage measurement value V_boost_ref; And supplying the auxiliary battery power to the boost output terminal when the VCC voltage measurement value Vref is greater than the boost output voltage measurement value V_boost_ref. Thereby providing an activation method.

Wherein the boost output voltage measurement value V_boost_ref is a voltage applied to the second resistor among a first resistor connected in series and a boost output voltage applied to the second resistor, the VCC voltage measurement value Vref is a third resistor connected in series, And the voltage applied to the fourth resistor among the VCC voltage applied to the resistor.

According to the present invention, when the boost output voltage is low, the external auxiliary battery voltage is selectively applied to increase the output voltage rising slope of the boost converter power, thereby fundamentally reducing the current stress of the boost output stage diode and the capacitor. Can be shortened.

In other words, according to the present invention, it is possible to structurally improve the reactivity of the boost converter power supply that supplies power to various sensors and the like at the time of IG ON, so that the waiting time until the start of the fault diagnosis of the sensor after starting the CPU can be reduced, Time can be reduced.

This improves the initial maneuverability of the controller for the environment vehicle, so that the driving time of the initial function of the hybrid vehicle and the electric car can be remarkably improved, thereby contributing to the improvement of the vehicle commerciality.

1 is a diagram showing a boost converter power supply circuit structure of a controller for a conventional environment vehicle
2 is a diagram showing a sequence of IG ON / OFF of a conventional boost converter power supply
3 is a diagram illustrating a boost converter power supply circuit structure of a controller for an environmental vehicle according to the present invention;
4 is a view showing a sequence of the IG ON / OFF of the power source of the boost converter according to the present invention
FIG. 5 is a flowchart showing the boosting process of the boost converter power supply output voltage of the controller for an environmental vehicle according to the present invention

Hereinafter, the present invention will be described with reference to the accompanying drawings.

The present invention relates to boost converter power supply output voltage boosting technology for shortening the initial start time compared to the conventional boost converter power supply, and more particularly, to a boost converter boost converter that suppresses the inrush current and output current of the boost converter and boosts the boost output voltage In addition, if the boost output voltage is low, the external auxiliary battery voltage can be selectively applied. In addition, the inrush current and output current of the diode and the capacitor of the output terminal of the boost converter are structurally blocked, .

FIG. 3 is a circuit diagram of a boost converter power supply circuit of a controller for an environmental vehicle according to the present invention. As a boosting device for boosting the output voltage (boost output voltage) of a boost converter power supply, Are shown.

3, the boost output voltage boosting apparatus according to the present invention includes a power-on switch Q1, an end gate 4, and a comparator 5. [

The power-on switch Q1 is capable of turning on / off the input of the auxiliary battery power to the boost converter power output terminal (boost output terminal), that is, by turning on / off the voltage of the auxiliary battery power For example, a transistor, which can supply or cut off the output of the boosted output terminal.

When the power-on switch Q1 is implemented as a transistor, the current of the auxiliary battery power source connected to the collector side flows to the emitter side in accordance with the output value of the end gate input to the base side. In other words, When the HIGH output is inputted, the current of the auxiliary battery power source is energized from the collector to the emitter side, so that the boost output voltage can be assisted.

The power-on switch Q1 is connected to the output terminal of the diode D at the boost output terminal to supply the auxiliary battery voltage to the boost output terminal.

The end gate 4 receives the output signal of the comparator 5 as a first input and receives the control signal of the CPU 3 as a second input and outputs a control signal when the first and second inputs are both in a high state The input current (or drive current) can be supplied to the base side of the power-on switch Q1.

Here, the CPU 3 basically outputs a high-level signal to the end gate 4 at all times.

The comparator 5 compares the boost output voltage measured value V_boost_ref measured using the ratio of the first resistor R1 and the second resistor R2 with the ratio of the third resistor R3 and the fourth resistor R4 The VCC voltage measurement value Vref, which is measured using the VCC voltage measurement value, is input, and the comparison result of V_boost_ref and Vref is outputted as HIGH or LOW state.

In other words, the comparator 5 can output a LOW or HIGH value according to the comparison result of V_boost_ref and Vref.

The VCC voltage is a voltage value output from the first power supply unit of the control power supply regulator IC 1. When the IG is ON, the VCC voltage is output from the first power supply unit by driving the regulator IC 1 for the control power supply, (R3) and the fourth resistor (R4) according to the respective resistance values.

The buck output voltage output from the buck power supply of the control power supply regulator IC 1 is input to the boost converter IC 2 to enable the output operation (drive) of the boost converter IC 2. [

In the case of the control power supply regulator IC 1, the IG on / off state and the auxiliary battery power are input, and in the case of the boost converter IC 2, the buck output voltage is input.

3, the VCC voltage of the first power supply unit in the control power supply regulator IC 1 rises at the moment when IG is turned on. When the VCC voltage is stabilized, the third resistor R3 and the fourth resistor R4 ) Is used to generate the VCC voltage measurement value Vref.

The output of the comparator 5 becomes HIGH or ON when the Vref is greater than V_boost_ref which is the boost output voltage measured value and the power on switch Q1) is also turned on so that the voltage can be supplied from the auxiliary battery power source to the boost output terminal.

Accordingly, when the voltage of the auxiliary battery power is supplied to the boost output terminal, the voltage of the boost converter IC 2 and the auxiliary battery power supply take charge of the boost output at the same time, thereby improving the responsiveness of the boost converter power supply.

Also, since the voltage supplied from the auxiliary battery power supply is supplied to the boost output terminal, the rising slope of the diode current Id becomes very low compared with the conventional one, so that the current stress of the diode D and the capacitor C1 can be abruptly reduced.

In addition, the power-on switch Q1 is turned on during a period in which Vref is greater than V_boost_ref even during IG Off, so that the magnitude of the diode current Id can be reduced.

In other words, it is possible to prevent the diode current Id from being abruptly raised through the selective addition of the auxiliary battery voltage when the IG is turned on / off, thereby substantially improving the device durability of the diode D and the capacitor C1 at the boost output stage can do.

Accordingly, in the present invention, it is possible to reduce the material cost by using the device of the rated current class near the steady state instead of the high-precision device, which is used to correspond to the diode inrush current of the boost output stage at the time of IG ON / In addition, the test time and cost for verifying the use of the high-precision device can be reduced.

Fig. 4 shows a sequence of the boost converter power supply circuit according to the present invention, which shows a variation in the boost output voltage in a section in which the power-on switch Q1 is turned on.

As shown in FIG. 4, it can be seen that the boost output voltage reaches the steady state before the initial operation of the CPU.

Meanwhile, FIG. 5 shows a boost converter output voltage boosting process of the controller for an environmental vehicle according to the present invention.

As shown in FIG. 5, in the boost converter output voltage boosting process according to the present invention, when the IG is ON (S10), the boost converter IC operates to output an output voltage (S11); Comparing Vref with V_boost_ref to determine whether the Vref value is greater than the V_boost_ref value (S12); And a step S13 of outputting a comparator output in a HIGH state to turn on the power-on switch Q1 when Vref is greater than V_boost_ref. At this time, the power-on switch Q1 is turned on ), The auxiliary battery power is supplied to the boost output terminal (S14), and the boost output voltage enters the normal state before the CPU operates.

If the Vref value is determined to be smaller than the V_boost_ref value, the output of the comparator 5 becomes LOW, so that the output of the end gate 4 also becomes LOW. As a result, the power-on switch Q1 is turned off (S15) and the auxiliary battery power is not supplied to the boost output stage.

The VCC voltage measurement value Vref, which is one of the input values of the comparator 5, is a voltage value applied to the fourth resistor R4 according to the ratio of the third resistor R3 and the fourth resistor R4 connected in series, The boost output voltage measurement value V_boost_ref, which is another input value of the second resistor 5, is a voltage value applied to the second resistor R2 in accordance with the ratio of the first resistor R1 and the second resistor R2 connected in series.

In other words, Vref is a voltage value applied to the fourth resistor R4 among the VCC voltages applied to the third resistor R3 and the fourth resistor R4 connected in series, and V_boost_ref is a voltage value applied to the first resistor R1 Is the voltage applied to the second resistor R2, that is, the voltage value applied to the second resistor R2 among the boost output voltage applied to the output terminal of the diode D configured at the boost output terminal.

Since the boost converter power supply circuit of the present invention for the above-described boosting process can improve the quick response of the boost output voltage to the conventional circuit, the boost output voltage can be stabilized very quickly before the CPU operates. Therefore, The time can be reduced and the initial start-up time of the controller can be very innovative.

In addition, according to the present invention, the CPU can measure the voltage of the auxiliary battery power source and further improve the device stability by selectively turning on / off the power-on switch Q1 during a period in which the auxiliary battery voltage is extremely higher than the device specification.

1: Regulator IC for Control Power Supply
2: Boost converter IC
3: CPU
4: end gate
5: comparator

Claims (6)

For boosting the output voltage of the boost converter power supply,
A comparator for receiving the boost output voltage measurement value V_boost_ref and the VCC voltage measurement value Vref and determining an output signal according to the comparison result;
An end gate for receiving the output signal of the comparator and the control signal of the CPU to determine an output signal;
A power-on switch that is turned on / off according to a signal input from the end gate to connect or disconnect the auxiliary battery power to the boost output terminal;
And a boost converter for boosting the output voltage of the boost converter for an environmental vehicle.
The method according to claim 1,
Wherein the boost output voltage measurement value V_boost_ref is a voltage applied to the second resistor among a first resistor connected in series and a boost output voltage applied to the second resistor.
The method according to claim 1,
Wherein the VCC voltage measurement value Vref is a voltage applied to the fourth resistor among the third resistor connected in series and the VCC voltage applied to the fourth resistor.
A step of outputting the boost output voltage by operating the boost converter IC when IG is ON;
Comparing the VCC voltage measurement value Vref and the boost output voltage measurement value V_boost_ref;
If the VCC voltage measurement value Vref is greater than the boost output voltage measurement value V_boost_ref, turning on the power on switch Q1 to supply the auxiliary battery power to the boost output stage;
And a boost converter for boosting the output voltage of the boost converter for the environment vehicle.
The method of claim 4,
Wherein the boost output voltage measurement value V_boost_ref is a voltage applied to the second resistor among a first resistor connected in series and a boost output voltage applied to the second resistor.
The method of claim 4,
Wherein the VCC voltage measurement value Vref is a voltage applied to the fourth resistor among a third resistor connected in series and a VCC voltage applied to the fourth resistor.

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