KR101715834B1 - A smart slope controller for power MOSFET switch - Google Patents

A smart slope controller for power MOSFET switch Download PDF

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Publication number
KR101715834B1
KR101715834B1 KR1020150147870A KR20150147870A KR101715834B1 KR 101715834 B1 KR101715834 B1 KR 101715834B1 KR 1020150147870 A KR1020150147870 A KR 1020150147870A KR 20150147870 A KR20150147870 A KR 20150147870A KR 101715834 B1 KR101715834 B1 KR 101715834B1
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South Korea
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time
control unit
voltage
driver control
output voltage
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KR1020150147870A
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Korean (ko)
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이명희
성제우
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울산과학기술원
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/16—Modifications for eliminating interference voltages or currents
    • H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
    • H03K17/162—Modifications for eliminating interference voltages or currents in field-effect transistor switches without feedback from the output circuit to the control circuit
    • H03K17/163—Soft switching

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Abstract

The present invention relates to a slope controller for a power MOSFET switch. The slope controller for a power MOSFET switch according to an embodiment of the present invention comprises: an inclination measuring unit measuring inclination of output voltage of a driver control unit for operating the power MOSFET switch; and a control logic unit generating a trimming signal for controlling an output current of the driver controller based on a difference between the measured inclination of the output voltage and a target inclination and providing the trimming signal for the driver controller. Even if any size of MOSFET switch is placed at a driver controller terminal, the inclination of the output voltage, that is increase time or decrease time the output voltage, is self-corrected. Thus, a circuit of the driver control unit is not required to be changed even though a load is changed, and an IC applied with the smart slope controller for a power MOSFET switch can correct an error value by continuously self-correcting the inclination of the output voltage by feedback even though an output of the driver control unit has an error by a process error.

Description

[0001] The present invention relates to an intelligent slope controller for a power MOSFET switch,

The present invention relates to driving a power MOSFET, and more particularly to an intelligent slope controller for a driver for a power MOSFET switch.

Switches implemented as power MOSFETs must change their driving capability depending on the application of the load, resulting in a change in the size of the MOSFET. Because the size of the MOSFET directly affects the gate capacitance of the MOSFET, the amount of current output from the driver control stage driving the gate of the MOSFET must be regulated.

Therefore, it is troublesome to change the circuit every time the load is changed.

The following Patent Document 1 controls the slope at the time of the rising transition and the falling transition adaptively in response to the drain source voltage and the gate source voltage of the power MOS transistor to generate electromagnetic waves of the DC-DC converter applied to the power management integrated circuit And can improve the EMI noise by appropriately adjusting the switching speed of the power switching transistor according to the transient conditions.

KR 10-2014-0007646 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a driver control apparatus and a driver control method of a driver control unit that measures a slope of an output voltage of a driver control unit and adjusts an output current of a driver control unit based on a difference between a measured slope and a target slope, It is an object of the present invention to provide an intelligent slope controller for a driver for a power MOSFET switch that avoids frequent circuit changes.

Another problem to be solved by the present invention is to measure the rising body and falling time of the output voltage of the driver control unit and to calculate the output current of the driver control unit based on the measured error values of the rise time and fall time, To thereby provide an intelligent slope controller for a driver for a power MOSFET switch that avoids frequent circuit changes even if a MOSFET switch of any size is applied to the driver stage.

According to an aspect of the present invention, there is provided an intelligent slope controller for a driver for a power MOSFET switch,

A tilt measuring unit for measuring a tilt of an output voltage of the driver control unit for driving the power MOSFET switch; And

And a control logic unit for generating a trimming signal for controlling an output current of the driver control unit based on a difference between a slope of the measured output voltage and a target slope and providing the trimming signal to the driver control unit.

In an intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

A time measuring unit for measuring a time when the output voltage of the driver control unit rises from the first voltage to the second voltage; And

And a slope calculating unit for calculating a slope of the output voltage of the driver control unit based on the time measured by the time measuring unit.

In an intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

The first voltage is 10% of the maximum value of the output voltage of the driver control unit,

The second voltage is 90% of the maximum value of the output voltage of the driver control unit,

The time-

A first time measuring unit for measuring a time when the output voltage of the driver control unit becomes the first voltage;

A second time measuring unit for measuring a time when the output voltage of the driver control unit becomes the second voltage; And

And a subtracting unit for calculating a difference between the time measured by the second time measuring unit and the time measured by the first time measuring unit.

In an intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

The slope calculating unit may calculate a slope of the output voltage of the driver control unit by dividing the value obtained by subtracting the first voltage from the second voltage by the time difference.

In the intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

A first comparator comparing the output voltage of the driver control unit with the first voltage and outputting a trigger signal when the output voltage is greater than the first voltage; And

And a first counter for performing a counting operation according to a predetermined clock signal until a trigger signal is output from the first comparator,

Wherein the second time measuring unit comprises:

A second comparator for comparing the output voltage of the driver control unit with the second voltage and outputting a trigger signal when the output voltage is greater than the second voltage; And

And a second counter for performing a counting operation according to a predetermined clock signal until a trigger signal is output from the second comparator.

In the intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

A rising slope measuring unit for measuring a rising slope of the output voltage of the driver control unit; And

And a falling tilt measuring unit for measuring a falling tilt of the output voltage of the driver control unit.

Further, in an intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

A first control logic for generating a first trimming signal for controlling an output current of the driver control unit based on a difference between the measured rising slope and the target rising slope and providing the generated first trimming signal to the driver control unit; And

And a second control logic unit for generating a second trimming signal for controlling the output current of the driver control unit based on the difference between the measured falling slope and the target falling slope and providing the generated second trimming signal to the driver control unit.

According to another aspect of the present invention, there is provided an intelligent slope controller for a driver for a power MOSFET switch,

A rise time and a fall time measuring unit for measuring a rise time and a fall time of an output voltage of the driver control unit for driving the power MOSFET switch; And

And a control logic unit for generating a trimming signal for controlling an output current of the driver control unit based on the measured rise time and falling time and providing the trimming signal to the driver control unit.

In the intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention, the rise time and fall time measuring unit may include:

A rise time measuring unit for measuring a time when the output voltage of the driver control unit rises from the first voltage to the second voltage; And

And a falling time measuring unit for measuring a falling time of the output voltage of the driver control unit from the second voltage to the first voltage.

Further, in an intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

A first control logic unit for generating a first trimming signal for controlling the output current of the driver control unit based on a difference between the measured rise time and the target rise time and providing the generated first trimming signal to the driver control unit; And

And a second control logic unit for generating a second trimming signal for controlling the output current of the driver control unit based on the difference between the measured falling time and the target falling time and providing the generated second trimming signal to the driver control unit.

In an intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

The first voltage is 10% of the maximum value of the output voltage of the driver control unit,

The second voltage is 90% of the maximum value of the output voltage of the driver control unit,

Wherein the rise time measuring unit comprises:

A first time measuring unit for measuring a time when the output voltage of the driver control unit becomes the first voltage;

A second time measuring unit for measuring a time when the output voltage of the driver control unit becomes the second voltage; And

And a first subtractor for subtracting the time measured by the first time measuring unit from the time measured by the second time measuring unit to output the rising time.

In the intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention,

A third time measuring unit for measuring a time when the output voltage of the driver control unit becomes the second voltage at a maximum value;

A fourth time measuring unit for measuring a time when the output voltage of the driver control unit becomes the first voltage at a maximum value; And

And a second subtractor for subtracting the time measured by the third time measuring unit from the time measured by the fourth time measuring unit to output the falling time.

According to the intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention, even if a MOSFET switch of any size is applied to the driver control unit stage, the slope of the output voltage, that is, the rise time And the fall time can be self-corrected, it is not necessary to change the circuit of the driver control unit every time the load is changed. In addition, according to the embodiment of the present invention, even if an error occurs in the output of the driver control unit due to a process error, the IC according to the present invention can continuously correct the error value by self-correcting the slope of the output voltage by feedback.

1 is a block diagram of an intelligent slope controller for a driver for a power MOSFET switch according to a first embodiment of the present invention;
Figure 2 shows an exemplary current trimming section in a driver control section.
3 is a detailed block diagram of the tilt measuring unit shown in Fig.
4 is a graph for explaining the slope of the output voltage of the driver control unit;
5 is a block diagram of an intelligent slope controller for a driver for a power MOSFET switch according to a second embodiment of the present invention;
6 is a block diagram of an intelligent slope controller for a driver for a power MOSFET switch according to a third embodiment of the present invention;
7 is a graph for explaining a rise time and a fall time of the output voltage of the driver control unit;
8 is a detailed block diagram of the intelligent slope controller for the driver for the power MOSFET switch shown in Fig.
9 is a detailed block diagram of the rise time measuring unit shown in FIG.
10 is a detailed block diagram of the falling time measuring unit shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention Should be construed in accordance with the principles and the meanings and concepts consistent with the technical idea of the present invention.

It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings.

Also, the terms "first", "second", "one side", "other side", etc. are used to distinguish one element from another, It is not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

≪ Embodiment 1 >

1 is a block diagram of an intelligent slope controller 104 for a driver for a power MOSFET switch according to a first embodiment of the present invention.

The intelligent slope controller 104 for a driver for a power MOSFET switch according to the first embodiment of the present invention shown in Fig. 1 controls the output voltage Vout of the driver control unit 100 for driving the power MOSFET switch 102 ) slope (the output of the gradient measurement unit 108, and the measured output voltage (V out), the slope (SL VOUT) and the target based on the difference between the slope and the driver control unit 100 for measuring the SL VOUT) of And a control logic unit 106 for generating a trimming signal for controlling the current I and providing the trimming signal to the driver control unit 100. The driver control unit 100 is for controlling the operation of the power MOSFET switch 102.

Referring to the intelligent slope controller 104 for a driver for a power MOSFET switch according to an embodiment of the present invention shown in FIG. 1, the tilt measuring unit 108 provided at the gate terminal of the power MOSFET switch 102 is connected to a power MOSFET The slope (SL VOUT ) of the output voltage (V OUT ) of the driver control section (100) is measured during operation of the switch (102).

The control logic unit 106 generates a trimming signal based on the difference between the slope SL VOUT of the output voltage V OUT of the driver control unit 100 and the target slope, which is output from the slope measuring unit 108. The control logic unit 106 provides the trimming signal as a feedback signal to the driver control unit 100 to control the output current I of the driver control unit 100. [

According to the intelligent slope controller 104 for the driver for the power MOSFET switch according to the embodiment of the present invention, when the size of the power MOSFET switch 102 is changed so that the load capacitor is changed, And if the slope is steep, the output current is reduced so that the output voltage is self-corrected to have a constant slope.

The driver control unit 100 includes a current trimming unit for controlling the output current I of the driver control unit 100 as shown in FIG. Referring to the exemplary current trimming unit shown in FIG. 2, the operation of the first through the n-th switches SW1 through SWn is controlled by the trimming signal output from the control logic unit 106 so that the output current I out is changed do. In Fig. 2, reference numerals 200_1 to 200 - n denote current sources providing currents of different magnitudes. Accordingly, the operation of the first through the n-th switches SW1 through SWn is controlled according to the trimming signal, which is the feedback signal outputted from the control logic unit 106, so that the output current I of the driver control unit 100 is adjusted.

3 is a detailed block diagram of the tilt measuring unit 108 shown in FIG.

The tilt measuring unit shown in FIG. 3 may be configured to measure a time t r at which the output voltage V OUT of the driver control unit 100 rises from the first voltage V th_low to the second voltage V th_hi (SL VOUT ) of the output voltage V OUT of the driver control unit 100 based on the time measured by the time measuring units 300, 302 and 304 and the time measured by the time measuring units 300, And a tilt calculating unit 306 for calculating the tilt.

The first voltage V th_low is 10% of the maximum value V DD of the output voltage V OUT of the driver control unit 100 and the second voltage V th_hi is the output of the driver control unit 100 Is 90% of the maximum value (V DD ) of the voltage (V OUT ).

The time measuring units 300, 302 and 304 may measure the time t LOW when the output voltage V OUT of the driver control unit 100 becomes the first voltage V th_low . A second time measuring unit 302 for measuring a time t HIGH when the output voltage V OUT of the driver control unit 100 becomes the second voltage V th_hi , , and the second time measured in the measurement unit 302 time (t HIGH) and for calculating the difference (t -t HIGH LOW) of the time (t LOW) measured by the first time measuring unit (300) And a subtraction unit 304. [

The tilt calculator 306 divides the value obtained by subtracting the first voltage V th_low from the second voltage V th_hi by the time difference t HIGH -t LOW and outputs the output of the driver controller 100 And calculates the slope SL VOUT of the voltage V OUT .

The first time measuring unit 300 compares the output voltage V OUT of the driver control unit 100 with the first voltage V th_low so that the output voltage V OUT is lower than the first voltage V OUT , the first comparator 308 to output a larger when the trigger signal than (V th_low), and a performing a counting operation in accordance with a predetermined clock signal (CLK) until a trigger signal output from the first comparator (308) 1 < / RTI >

The second time measuring unit 302 compares the output voltage V OUT of the driver control unit 100 with the second voltage V th_hi so that the output voltage V OUT is lower than the second voltage V th_hi ), and a second comparator (312) for performing a counting operation according to a predetermined clock signal (CLK) until the trigger signal is outputted from the second comparator (312) (314).

3, the first comparator 308 and the second comparator 312 detect when the output voltage V OUT of the driver control unit 100 becomes 10% and 90% of the maximum value V DD, respectively , And the first counter 310 and the second counter 314 measure the time at that time using a clock (CLK).

The operation of the tilt measuring unit shown in FIG. 3 will be described in detail below.

The output voltage V OUT of the driver control unit 100 is input to the non-inverting input terminals of the first comparator 308 and the second comparator 312.

At this time, the first voltage V th_low which is the threshold voltage of the first comparator 308 is set to (0.1 x V DD ) which is 10% of the maximum value V DD and the threshold voltage of the second comparator 312 The second voltage V th_hi is set to (0.9 x V DD ) which is 90% of the maximum value V DD . The first comparator 308 and the second comparator 312 generate a trigger signal when the voltage input to the respective non-inverting input terminal reaches the threshold voltage.

First, when the voltage input to the non-inverting input terminal of the first comparator 308 reaches the first voltage V th_low as the threshold voltage, the first comparator 308 generates the trigger signal, and the first counter 310 ) Checks how many times (n1) the pulse (CLK) that has been separately received has generated the pulse.

When the voltage input to the non-inverting input terminal of the second comparator 312 reaches the second voltage V th_hi , which is the threshold voltage, the second comparator 312 generates the trigger signal and the second counter 314 ) Checks how many times (nh) the clock (CLK) that has been received separately has generated the pulse. In the above, nl and nh are positive integers.

At this time, the period of the clock (CLK) t CLK is set to 1/10 or less of the minimum rise time or fall time supported by the driver.

The time t LOW at which the output voltage V OUT of the driver control unit 100 reaches the first voltage V th_low as the threshold voltage can be represented by nl x t CLK and the output of the driver control unit 100 The instant t HIGH at which the voltage V OUT reaches the second voltage V th_hi , which is the threshold voltage, can be expressed as nh x t CLK .

The subtracter 304 subtracts the time (nl x tCLK ) output from the first counter 310 at the time (nh x t CLK ) output from the second counter 314 and outputs the time difference (nh-nl ) X t CLK .

That is, the output voltage (V OUT) is the first voltage, and the clock counting the number of times nl, when the (V th_low) is reached, the output voltage (V OUT) is a clock counting the number of times once it has reached the second voltage (V th_hi) nh , The rise time t r is measured as ((nh-nl) x t CLK ).

The slope calculating unit 306 calculates a value obtained by subtracting the first voltage V th_low from the second voltage V th_hi by the time difference t HIGH -t LOW , the slope SL VOUT of the output voltage V OUT of the driver control unit 100 is divided by the current control value t r and the slope is adjusted by the change of (nh-nl) due to the current control during the self adjustment.

Figure 112015103038735-pat00001

As described above, the intelligent slope controller 104 for the driver for the power MOSFET switch according to the embodiment of the present invention measures the slope of the output voltage of the driver control unit 100 and calculates the slope error value And feeds back a trimming signal which is increased or decreased by a required amount of current to the driver control unit 100 to control the current I outputted from the driver control unit 100. [

≪ Embodiment 2 >

5 is a block diagram of an intelligent slope controller for a driver for a power MOSFET switch according to a second embodiment of the present invention.

The intelligent slope controller 504 for the driver for the power MOSFET switch according to the second embodiment of the present invention shown in Fig. 5 detects the output voltage V OUT (V OUT ) of the driver control unit 500 for driving the power MOSFET switch 502 (I) of the driver control unit 500 based on a difference between a slope of the measured output voltage V OUT and a target slope, and a slope measurement unit 506, 508 for measuring a slope of the output voltage V OUT And control logic units 510 and 512 for generating trimming signals SL1 and SL2 for providing the driving signals to the driver control unit 500. [

The tilt measuring units 506 and 508 may include a rising tilt measuring unit 506 for measuring the rising slope SL r of the output voltage V OUT of the driver control unit 500 and an output of the driver controlling unit 500 And a falling slope measuring unit 508 for measuring the falling slope SL f of the voltage V OUT .

The control logic unit 510 and 512 control the first trimming signal SL to control the output current I of the driver control unit 500 based on the difference between the measured rising slope SL r and the target rising slope to generate SL1) on the basis of difference between the first control logic unit 510, and the measured falling slope (SL f) and a target falling ramp to provide a first current control portion 514 of the driver controller 500 A second control logic unit 512 for generating a second trimming signal SL2 for controlling the output current I of the driver control unit 500 and providing the generated second trimming signal SL2 to the second current control unit 516 of the driver control unit 500, ).

In the intelligent slope controller for the driver for the power MOSFET switch according to the second embodiment of the present invention shown in FIG. 5, the rising slope SL r of the output voltage V OUT of the driver control unit 500 and the falling slope SL f ) of the first trimming signal SL1 and the second trimming signal SL2 are compared with the target rising slope and the falling slope, respectively, and the first trimming signal SL1 and the second trimming signal SL2 are supplied to the driver control unit 500 as feedback signals The output current I of the driver control unit 500 is adjusted.

The method of measuring the rising slope SL r and the falling slope SL f in the rising slope measuring unit 506 and the falling slope measuring unit 508 is a method of measuring the slope in the slope measuring unit shown in FIG. The description thereof will be omitted.

≪ Third Embodiment >

6 is a block diagram of an intelligent slope controller 604 for a driver for a power MOSFET switch according to a third embodiment of the present invention.

The intelligent slope controller 604 for the driver for the power MOSFET switch according to the third embodiment of the present invention shown in Fig. 6 controls the output voltage V OUT of the driver control unit 600 for driving the power MOSFET switch 602 ) on the basis of the rise time (t r) and the fall time (t f), the rise time and fall-time measuring unit 608, and the measured rise time (t r) and the fall time (t f to measure) of And a control logic unit 606 for generating a trimming signal for controlling the output current I of the driver control unit 600 and providing the trimming signal to the driver control unit 600. The driver control unit 600 is for controlling operation of the power MOSFET switch 602.

The slope of the output voltage V OUT output from the driver control unit 600 by the gate capacitor C L of the power MOSFET switch 602 and the output current I is determined according to Equation (2).

Figure 112015103038735-pat00002

C is the capacitance of the gate capacitor, V is the output voltage of the driver control unit 600, and I is the output current of the driver control unit 600. Here, R is the resistance value, C is the capacitance, C L is the capacitance of the gate capacitor.

The output current I of the driver control unit 600 can be determined by Equation (2) as shown in Equation (3).

Figure 112015103038735-pat00003

T r is the rise time of the output voltage of the driver control unit 600 and t f is the fall time of the output voltage of the driver control unit 600.

7, the rising time t r is a maximum value of 10 during the period in which the output voltage V OUT of the driver control unit 600 increases from the minimum value (0) to the maximum value (V DD ) and the time between% is 90%, and the fall time (t f) is the output voltage (V OUT) 90 of the maximum value of the period to go to a decrease in the maximum value (V DD) to the Min of the driver controller 600, It is the time between 10% and 10%.

Referring to the intelligent slope controller 604 for the driver for the power MOSFET switch according to the third embodiment of the present invention shown in FIG. 6, the rise time and fall time measuring unit (not shown) provided at the gate terminal of the power MOSFET switch 602 608 measures a rise time t r and a fall time t f that are values reflecting the slope or the slope of the output voltage V OUT of the driver control unit 600 during the operation of the power MOSFET switch 602 .

The control logic unit 606 performs trimming on the basis of the rise time t r and the fall time t f of the output voltage V OUT of the driver control unit 600 output from the rise time and fall time measuring unit 608 Signal. The control logic unit 606 provides the trimming signal to the driver control unit 600 as a feedback signal to control the output current I of the driver control unit 600. [

According to the intelligent slope controller 604 for the driver for the power MOSFET switch according to the third embodiment of the present invention, when the size of the power MOSFET switch 602 is changed so that the load capacitor is changed, If the slope is steady, the output current is reduced. If the slope is steep, the output current is reduced so that the output voltage has a constant rise and fall time.

The driver control unit 600 includes a current trimming unit for controlling the output current I of the driver control unit 600 as shown in FIG. Referring to the exemplary current trimming unit shown in FIG. 2, the operation of the first through the n-th switches SW1 through SWn is controlled by a trimming signal output from the control logic unit 606 so that the output current I out is changed do. In Fig. 2, reference numerals 200_1 to 200 - n denote current sources providing currents of different magnitudes. Accordingly, the operation of the first through the n-th switches SW1 through SWn is controlled according to the trimming signal, which is a feedback signal outputted from the control logic unit 606, so that the output current I of the driver control unit 600 is adjusted.

As described above, the intelligent slope controller 604 for the driver for the power MOSFET switch according to the third embodiment of the present invention calculates the rise time t r (t), which reflects the slope of the output voltage V OUT of the driver controller 600 ) And a falling time t f , and feeds back a trimming signal to the driver controller 600, which feeds back a trimming signal that is increased or decreased by an amount of current required for the error value in a case where the difference is different from the target rising time or the target falling time, (I).

FIG. 8 is a detailed block diagram of an intelligent slope controller 604 for a driver for a power MOSFET switch according to the third embodiment of the present invention shown in FIG.

The intelligent slope controller 804 for the driver for the power MOSFET switch shown in Fig. 8 includes a rise time measuring unit 806, a fall time measuring unit 808, a first control logic unit 810, 812 < / RTI >

The rise time measuring unit 806 measures a rise time t r of the output voltage V OUT of the driver control unit 800 for driving the power MOSFET switch 802, (T f ) of the output voltage (V OUT ) of the driver control unit (800).

The first control logic unit 810 generates a first trimming signal for controlling the output current I of the driver control unit 800 based on the difference between the measured rise time t r and the target rise time ST1) to the first current control unit 814 in the driver control unit 800. [

The second control logic unit 812 generates a second trimming signal for controlling the output current I of the driver control unit 800 based on the difference between the measured fall time t f and the target fall time And provides the second current control unit 816 in the driver control unit 800. [

According to the intelligent slope controller 804 for a driver for a power MOSFET switch according to an embodiment of the present invention, the first control logic 810 calculates an error value (a difference between a measured rise time t r and a target rise time) A first trimming signal ST1 for controlling the output current I of the driver control unit 800 is generated and provided to the first current control unit 814 in the driver control unit 800 as a feedback signal, And controls the current (I) output from the driver control unit 800.

The second control logic unit 812 may control the output current I of the driver control unit 800 based on an error value that is a difference between the measured fall time t f and the target fall time, And controls the current I outputted from the driver control unit 800 by providing a signal ST2 to the second current control unit 816 in the driver control unit 800 as a feedback signal.

FIG. 9 is a detailed block diagram of the rise time measuring unit 806 shown in FIG.

The rise time measuring unit 806 measures a time t LOW when the output voltage V OUT of the driver control unit 800 becomes the first voltage V th- A second time measuring unit 902 for measuring a time t HIGH when the output voltage V OUT of the driver control unit 800 becomes the second voltage V th -h i, And an output unit for outputting the rising time t r by subtracting a time t LOW measured by the first time measuring unit 900 at a time t HIGH measured by the second time measuring unit 902 1 subtracting unit 904.

9, reference numerals 906 and 908 denote comparators, and reference numerals 908 and 912 denote counters.

The operation of the rise time measuring unit shown in FIG. 9 is the same as the operation of the time measuring units 300, 302, and 304 shown in FIG. 3, and a description thereof will be omitted.

10 is a detailed block diagram of the falling time measuring unit 808 shown in FIG.

The falling time measuring unit 808 measures a time t1 when the output voltage V OUT of the driver control unit 800 becomes the second voltage V th -h i from the maximum value V DD A time t2 when the output voltage V OUT of the driver control unit 800 becomes the first voltage V th -low at the maximum value V DD is measured And a time t1 measured by the third time measuring unit 1000 at a time t2 measured by the fourth time measuring unit 1010 to calculate a falling time and a second subtractor 1020 for outputting t f .

The falling time measuring unit 808 shown in FIG. 10 may be configured using a comparator and a counter, similar to the rising time measuring unit 806 shown in FIG.

As described above, the intelligent slope controllers 604 and 804 for the driver for the power MOSFET switch according to the third embodiment of the present invention are constructed so that the slopes of the output voltages of the driver controllers 600 and 800, The first trimming signal ST1 and the second trimming signal ST2 which are added to or subtracted from the error values by a necessary amount of current are fed back to the driver control units 600 and 800 by measuring the fall time, (I) output from the first and second transistors (600, 800).

As described above, according to the intelligent slope controller for the driver for the power MOSFET switch according to the embodiments of the present invention, the slope of the output voltage of the driver control unit can be self-corrected even if a power MOSFET switch of any size is applied to the driver stage .

The most important characteristic of the intelligent slope controller for a driver for a power MOSFET switch according to the embodiments of the present invention is that the slope or the predetermined rise time and fall time of the load controller, regardless of which load capacitor is connected to the driver controller, It can be corrected. That is, the intelligent slope controller for a driver for a power MOSFET switch according to an embodiment of the present invention has a strength in versatility.

In the conventional method, the design of the driver control unit is changed according to the specific driver or the rise time and the fall time of the external input are manually adjusted to the target by using the RC time constant. However, The intelligent slope controller for the driver for the power MOSFET switch can continuously change the output current of the driver control unit according to the load capacitor through feedback so that the driver can know the target slope or the target rise and fall time You can keep it.

Further, according to the intelligent slope controller for the driver for the power MOSFET switch according to the embodiments of the present invention, another advantage can be obtained in the internal operation process. It is possible to increase the yield by decreasing the under-performance IC. Process error in semiconductor process is essential, which increases the possibility of under-performance due to temperature and voltage drop. ICs that do not meet specific target performance in ASIC design can not be commercialized. However, in the IC using the intelligent slope controller for the driver for the power MOSFET switch according to the embodiment of the present invention, even if the output of the driver control unit is abnormal due to the process error, the error value can be corrected by self-

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be modified or improved.

It will be understood by those skilled 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.

100, 500, 600, 800: Driver control unit
102, 502, 602, 802: Power MOSFET switch
104, 604, 804: intelligent slope controller for drivers for power MOSFET switches
106, 606: control logic unit 108: tilt measurement unit
200_1 to 200_n: current source C L : gate capacitor
300: first time measuring unit 302: second time measuring unit
304: subtractor 306: tilt calculator
308: first comparator 310: first counter
312: second comparator 314: second counter
506: rising slope measuring unit 508: falling slope measuring unit
510: first control logic unit 512: second control logic unit
514, 814: first current control section 516, 816: second current control section
608: rising time and falling time measuring unit
806: rising time measuring unit 808: falling time measuring unit
810: first control logic unit 812: second control logic unit
900: first time measuring unit 902: second time measuring unit
904: first subtracter 906, 910: comparator
908, 912: a counter 1000: a third time measuring unit
1010: fourth time measuring unit 1020: second subtracting unit

Claims (12)

A tilt measuring unit for measuring a tilt of an output voltage of the driver control unit for driving the power MOSFET switch; And
And a control logic unit for generating a trimming signal for controlling an output current of the driver control unit based on a difference between a slope of the measured output voltage and a target slope and providing the trimming signal to the driver control unit,
Wherein the tilt measuring unit comprises:
A time measuring unit for measuring a time when the output voltage of the driver control unit rises from the first voltage to the second voltage; And
And a slope calculating unit for calculating a slope of an output voltage of the driver control unit based on a time measured by the time measuring unit,
The first voltage is 10% of the maximum value of the output voltage of the driver control unit,
The second voltage is 90% of the maximum value of the output voltage of the driver control unit,
The time-
A first time measuring unit for measuring a time when the output voltage of the driver control unit becomes the first voltage;
A second time measuring unit for measuring a time when the output voltage of the driver control unit becomes the second voltage; And
And a subtracter for calculating a difference between a time measured by the second time measuring unit and a time measured by the first time measuring unit. delete delete The method according to claim 1,
The tilt calculator may calculate,
Wherein the slope of the output voltage of the driver control unit is calculated by dividing a value obtained by subtracting the first voltage from the second voltage by the time difference. The method of claim 4,
Wherein the first time measuring unit comprises:
A first comparator comparing the output voltage of the driver control unit with the first voltage and outputting a trigger signal when the output voltage is greater than the first voltage; And
And a first counter for performing a counting operation according to a predetermined clock signal until a trigger signal is output from the first comparator,
Wherein the second time measuring unit comprises:
A second comparator for comparing the output voltage of the driver control unit with the second voltage and outputting a trigger signal when the output voltage is greater than the second voltage; And
And a second counter for performing a counting operation according to a predetermined clock signal until a trigger signal is output from the second comparator. delete delete A rise time and a fall time measuring unit for measuring a rise time and a fall time of an output voltage of the driver control unit for driving the power MOSFET switch; And
And a control logic unit for generating a trimming signal for controlling the output current of the driver control unit based on the measured rise time and the fall time and providing the trimming signal to the driver control unit,
Wherein the rising time and falling time measuring unit comprises:
A rise time measuring unit for measuring a time when the output voltage of the driver control unit rises from the first voltage to the second voltage; And
And a falling time measuring unit for measuring a falling time of the output voltage of the driver control unit from the second voltage to the first voltage,
The control logic comprises:
A first control logic unit for generating a first trimming signal for controlling the output current of the driver control unit based on a difference between the measured rise time and the target rise time and providing the generated first trimming signal to the driver control unit; And
And a second control logic unit for generating a second trimming signal for controlling the output current of the driver control unit based on a difference between the measured falling time and the target falling time and providing the generated second trimming signal to the driver control unit,
The first voltage is 10% of the maximum value of the output voltage of the driver control unit,
The second voltage is 90% of the maximum value of the output voltage of the driver control unit,
Wherein the rise time measuring unit comprises:
A first time measuring unit for measuring a time when the output voltage of the driver control unit becomes the first voltage;
A second time measuring unit for measuring a time when the output voltage of the driver control unit becomes the second voltage; And
And a first subtractor for subtracting the time measured by the first time measuring unit from the time measured by the second time measuring unit to output the rising time. delete delete delete The method of claim 8,
Wherein the falling time measuring unit comprises:
A third time measuring unit for measuring a time when the output voltage of the driver control unit becomes the second voltage at a maximum value;
A fourth time measuring unit for measuring a time when the output voltage of the driver control unit becomes the first voltage at a maximum value; And
And a second subtractor for subtracting the time measured by the third time measuring unit from the time measured by the fourth time measuring unit to output the falling time.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000026909A (en) * 1998-10-23 2000-05-15 김영환 Output driver of semiconductor device
JP2009038517A (en) * 2007-07-31 2009-02-19 Panasonic Electric Works Co Ltd Driving circuit
KR20140007646A (en) 2012-07-10 2014-01-20 삼성전자주식회사 Circuit for driving power mos transistor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000026909A (en) * 1998-10-23 2000-05-15 김영환 Output driver of semiconductor device
JP2009038517A (en) * 2007-07-31 2009-02-19 Panasonic Electric Works Co Ltd Driving circuit
KR20140007646A (en) 2012-07-10 2014-01-20 삼성전자주식회사 Circuit for driving power mos transistor

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