KR102565113B1 - Appratus and method for adjusting of peak signal of dc-dc converter - Google Patents

Abstract

An apparatus for correcting a peak signal of a DC-DC converter according to an embodiment of the present invention includes a comparator for comparing a peak voltage of an output signal and a reference voltage with respect to an input signal applied to the DC-DC converter, and a peak voltage of the output signal. A counter unit counts the number of accumulations exceeding the reference voltage, and a control unit adjusting the slew rate of the output signal when the number of accumulations exceeds the preset reference number.

Description

DC-DC converter peak signal correction device and its correction method {APPRATUS AND METHOD FOR ADJUSTING OF PEAK SIGNAL OF DC-DC CONVERTER}

The present invention relates to a peak signal correction device of a DC-DC converter and a correction method thereof. More specifically, a technique for automatically correcting the peak voltage of an output signal is disclosed.

A DC-DC converter refers to a device that receives a DC (direct current) signal, changes the voltage, and outputs a DC (direct current) signal. Recently, with the diversification of electronic products, the operating voltage range is diversifying. The DC-DC converter is used to output a voltage lower than the input signal or a voltage higher than the input signal.

In the case of electronic products, in order to be sold on the market, they must receive electrical certification and radio certification. In this case, if electromagnetic waves generated from electronic products exceed the allowable range, the user must tune the DC-DC converter so that the switching peak voltage stays within the allowable voltage range. Accordingly, when many electronic products need to be certified, additional time and manpower costs are inevitably incurred.

Among the prior art, Korean Patent Publication No. 10-2017-0020599 relates to a DC-DC converter and a controller therefor, a transformer for boosting or stepping down input power, a main switch connected to the primary winding of the transformer, and the transformer. and a controller connected to a secondary winding of and outputting an output circuit for generating output power and a controller for outputting a control signal to the main switch to adjust the output power, wherein the controller includes a predetermined sampling time point for each cycle of the control signal. A sample-and-hold circuit for detecting the current flowing through the main switch, a comparison circuit for comparing the detected current with the current detected in the previous cycle of the control signal, and adjusting the sampling timing according to the comparison result of the comparison circuit. It is characterized by a technical feature of including a delay time controller for

However, the prior art has limitations in that it accurately detects the maximum current value by adjusting the sampling time point, but cannot adjust the slew rate by detecting the maximum voltage.

The technical problem to be solved by the present invention is to provide a peak signal correction device and a correction method of a DC-DC converter capable of correcting the peak voltage by adjusting the slew rate according to the peak voltage of the output signal of the DC-DC converter. am.

In addition, it is to provide a peak signal correction device and method for correcting the peak signal of a DC-DC converter that can determine whether or not to adjust the slew rate according to whether it falls within a preset range of electromagnetic waves.

An apparatus for correcting a peak signal of a DC-DC converter according to an embodiment of the present invention includes a comparator for comparing a peak voltage of an output signal and a reference voltage with respect to an input signal applied to the DC-DC converter, and a peak voltage of the output signal. A counter unit counts the number of accumulations exceeding the reference voltage, and a control unit adjusting the slew rate of the output signal when the number of accumulations exceeds the preset reference number.

In addition, the counter unit may initialize the accumulated number and newly count the accumulated number from a second point in time when a predetermined time has elapsed from the accumulated number at the first point in time.

Also, the control unit may decrease the slew rate value of the output signal when the number of times the peak voltage exceeds the reference voltage exceeds the reference number of times.

The communication unit may further include a communication unit communicating with an external communication terminal, and the control unit may change the reference voltage when the reference voltage is updated from the communication terminal and change the number of references according to the reference voltage.

Meanwhile, a correction method of a peak signal correction device of a DC-DC converter according to another embodiment of the present invention includes a comparison step of comparing a peak voltage of an output signal of an input signal applied to the DC-DC converter with a reference voltage. and a counter step for counting the number of times the peak voltage of the output signal exceeds the reference voltage, and determining the slew rate of the output signal when the number of times the peak voltage exceeds the reference voltage exceeds a predetermined reference number. It includes a control step to adjust.

Accordingly, the peak voltage may be corrected by adjusting the slew rate according to the peak voltage of the output signal of the DC-DC converter.

In addition, whether or not to adjust the slew rate may be determined depending on whether the electromagnetic wave falls within a predetermined electromagnetic wave range.

1 is a block diagram of a peak signal correction device of a DC-DC converter according to an embodiment of the present invention.
FIG. 2 is a flow chart illustrating a correction method of the peak signal correction device of the DC-DC converter according to FIG. 1 .
FIG. 3 is an exemplary diagram for explaining that a peak signal of an output signal is corrected by the peak signal correction device of the DC-DC converter according to FIG. 1 .
4 and 5 are exemplary diagrams for explaining slew rate adjustment by a control unit in the peak signal compensating device of the DC-DC converter according to FIG. 1 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms used are terms selected in consideration of functions in the embodiment, and the meaning of the terms may vary depending on the intention of a user or operator or a precedent. Therefore, the meaning of terms used in the embodiments to be described later, when specifically defined in the present specification, follows the definition, and when there is no specific definition, it should be interpreted as a meaning generally recognized by those skilled in the art.

1 is a configuration diagram of a peak signal compensating device of a DC-DC converter according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining a correction method of the peak signal compensating device of a DC-DC converter according to FIG. 1, FIG. 3 is an exemplary diagram for explaining that a peak signal of an output signal is corrected by the peak signal correction device of the DC-DC converter according to FIG. 1 .

Referring to FIGS. 1 to 3 , an apparatus 100 for correcting a peak signal of a DC-DC converter according to an embodiment of the present invention includes a comparison unit 110, a counter unit 120, and a control unit 130.

The comparator 110 compares the peak voltage of the output signal of the input signal applied to the DC-DC converter 10 with the reference voltage. Here, the DC-DC converter 10 may be implemented in various ways according to a user's design, and is not limited to a specific form. The comparator 110 compares the difference between the output signal of the DC-DC converter 10 and a preset reference voltage. Here, the reference voltage means the maximum allowable voltage. This reference voltage may vary depending on the product and topology of the DC-DC converter 10 used. The comparator 110 compares the peak voltage, which is the maximum value, among the output signals of the DC-DC converter 10 with the reference voltage.

The counter unit 120 is connected to the comparator 110 and counts the number of times the peak voltage of the output signal of the DC-DC converter 10 exceeds the reference voltage. The counter unit 120 determines whether the DC-DC converter 10 detects a peak voltage substantially exceeding the reference voltage and how many times it occurs. The counter unit 120 may accumulate and store counting information using an internal memory. In this case, the counter unit 120 may output counting information to the control unit 130 when a predetermined reference number of times is achieved.

In addition, the counter unit 120 may count the number of times the peak voltage exceeds the reference voltage at a predetermined time period, and reset the counting information when the predetermined time period has elapsed. For example, the counter unit 120 may initialize the accumulation count and newly count the accumulation count from the second time point when a preset time has elapsed from the accumulation count at the first time point. This is to distinguish whether a peak voltage temporarily occurs or a peak voltage continuously occurs according to the initial response characteristics of the DC-DC converter 10 .

The controller 130 determines whether the number of times the peak voltage of the DC-DC converter 10 exceeds the reference voltage exceeds a preset reference number. The control unit 130 adjusts the slew rate of the output signal when the peak voltage of the DC-DC converter 10 is detected exceeding a reference number of times during a preset time. For example, in FIG. 3 , when the number of peak voltages that exceed the reference voltage exceeds the reference number, the slew rate value of the output signal may be reduced after time t. Here, the reference number may vary depending on the product in which the DC-DC converter 10 is used.

In addition, the control unit 130 reduces the slew rate value of the DC-DC converter 10, and the number of times the peak voltage of the DC-DC converter 10 exceeds the reference voltage for a predetermined time exceeds the preset reference number. judge whether or not This is to check whether the peak voltage exceeds the reference voltage even after the slew rate value of the DC-DC converter 10 is changed by the control unit 130 . The controller 130 may additionally determine whether to change the slew rate by using the peak voltage at the first time point and the peak voltage at the second time point after changing the slew rate.

Meanwhile, the peak signal correction device 100 of the DC-DC converter according to the embodiment of the present invention may further include an electromagnetic wave sensor 140.

The electromagnetic wave detection unit 140 detects electromagnetic wave information of an output signal of the DC-DC converter 10 . The electromagnetic wave detection unit 140 may be implemented as an electromagnetic wave sensor. Here, electromagnetic wave information is used in the sense of including radio waves such as LF, VLF, LF, MF, HF, VHF, UHF, SHF, and EHF, light waves such as infrared rays, visible rays, and ultraviolet rays, and radiations such as X-rays and γ-rays. do. The electromagnetic wave detection unit 140 may be implemented as a radio wave sensor, an optical sensor, an X-ray sensor, a γ-ray sensor, etc., but is not necessarily limited thereto. The electromagnetic wave detection unit 140 may also be implemented in a form of receiving electromagnetic wave information through an external electromagnetic wave sensor. The electromagnetic wave detection unit 140 outputs electromagnetic wave information to the control unit 130 .

In this case, the control unit 130 determines whether or not the electromagnetic wave information is within a preset allowable electromagnetic wave range. It is preferable that the allowable electromagnetic wave range of a product to which the DC-DC converter 10 is connected is set in advance. This is because the allowable electromagnetic wave range is different depending on the product, so the allowable electromagnetic wave range may change depending on the type of product. The controller 130 may determine whether to adjust the slew rate according to electromagnetic wave information.

For example, when the electromagnetic wave information of the output signal of the DC-DC converter 10 is within the allowable electromagnetic wave range, the controller 130 may not adjust the slew rate even when the peak signal exceeds the reference voltage. The control unit 130 may adjust the slew rate when the electromagnetic wave information of the output signal of the DC-DC converter 10 exceeds the allowable electromagnetic wave range and the cumulative number of times the peak voltage exceeds the reference voltage exceeds the reference number. there is. This is to avoid adjusting the slew rate when there is no problem in the authentication test of the product in which the DC-DC converter 10 is installed.

Meanwhile, the peak signal correction device 100 of the DC-DC converter according to the embodiment of the present invention may further include a temperature sensor 150.

The temperature sensor 150 detects temperature information of the DC-DC converter 10 . The temperature sensing unit 150 may be implemented as a contact sensor or a non-contact sensor. The temperature sensor 150 measures temperature information of the DC-DC converter 10 and outputs it to the control unit 130 . The temperature sensing unit 150 detects temperature information of the DC-DC converter 10 to prevent malfunction or failure in advance. The temperature sensing unit 150 may be formed at a plurality of locations of the DC-DC converter 10 to sense temperature information. This is to enable more accurate temperature measurement based on temperature information detected at a plurality of locations.

For example, when the temperature sensing unit 150 is implemented as a contact sensor, it is possible to detect heat generated from the surface of the DC-DC converter 10 . When implemented as a non-contact sensor, the temperature sensing unit 150 may detect temperature information by acquiring an infrared image from the DC-DC converter 10 and analyzing a color temperature. This is to measure the temperature information of the DC-DC converter 10 in a non-contact manner so that the temperature information can be measured even in an environment where it is difficult to install a contact sensor. However, the temperature sensing unit 150 may be implemented with both a contact sensor and a non-contact sensor.

In this case, the controller 130 determines whether the temperature information measured by the temperature sensor 150 exceeds the reference temperature. For example, when the temperature information of the DC-DC converter 10 exceeds the reference temperature, the control unit 130 may lower the heating temperature by adjusting the slew rate. In this case, the reference temperature may be set differently depending on the DC-DC converter 10 . This is to lower and adjust the slew rate when the temperature information exceeds the reference temperature, apart from the peak voltage or electromagnetic wave detection of the DC-DC converter 10 . Accordingly, failure of the DC-DC converter 10 can be prevented by adjusting the slew rate in consideration of temperature information in addition to peak voltage and electromagnetic wave information.

In addition, the controller 130 may compare the first temperature information measured through the contact sensor with the second temperature information measured through the non-contact sensor to determine whether or not there is a failure. For example, when the first temperature information and the second temperature information are within a predetermined error range, the first temperature information is determined as a standard. When the first temperature information and the second temperature information exceed a predetermined error range, the second temperature information is determined as a standard. This is to determine the temperature of the DC-DC converter 10 when an error occurs due to performance deterioration of the temperature sensing unit 150 . Accordingly, it is possible to determine whether or not to adjust the slew rate based on the exact temperature of the DC-DC converter 10 .

Meanwhile, the peak signal correction device 100 of the DC-DC converter according to an embodiment of the present invention may further include a communication unit 160.

The communication unit 160 communicates with an external communication terminal. For example, the communication unit 160 may communicate with an external communication terminal in a wireless or wired manner. The communication unit 160 may receive setting information about the reference voltage of the comparator 110 or the reference number of counters from an external communication terminal. For example, even in the case of the same DC-DC converter 10, the reference voltage condition may vary depending on the range used. In this case, the reference voltage of the comparator 110 or the reference count of the counter is set in advance, but when the used range is changed, the setting information can be uniformly changed through the communication terminal.

In this case, the controller 130 changes the reference voltage when the reference voltage is updated from the communication terminal, and changes the number of references according to the reference voltage. The controller 130 may also change only the setting of the reference voltage or the setting of the number of references. When the reference voltage is changed, the controller 130 may initialize the counting information of the counter and receive the counting information again. Accordingly, the slew rate is actively adjusted according to the reference voltage and the number of references is changed without the user manually manipulating the DC-DC converter 10 to suit the characteristics of the product in which the DC-DC converter 10 is used. The output signal can be adjusted.

4 and 5 are exemplary diagrams for explaining slew rate adjustment by a control unit in the peak signal compensating device of the DC-DC converter according to FIG. 1 .

4 shows adjusting the slew rate when the first output switch 11 of the DC-DC converter 10 is switched to have a rise time, and FIG. 5 shows the second output switch of the DC-DC converter 10 (12) shows that the slew rate is adjusted when it is switched to have a fall time.

In FIG. 4 , the controller 130 includes a first switch M1 , a second switch M2 , a third switch M3 , and a fourth switch M4 connected to the first output switch 11 . In this case, the first output switch 11, the first switch M1, and the third switch M3 may be pMOSFETs, and the second switch M2 and the fourth switch M4 may be nMOSFETs. The sources of the first switch M1 and the third switch M3 are connected to S of the first output switch 11, and the drain of the first switch M1 is connected to G of the first output switch 11 and the second It is connected to the drain of switch M2. The drain of the third switch M3 is connected to G of the first output switch 11 and the drain of the fourth switch M4. The controller 130 turns on the second switch M2 and the fourth switch M4 when the first output switch 11 is switched and is at a rising time. This is to adjust the slew rate at a constant rate by adjusting the current flowing through G in the first output switch 11.

In FIG. 5 , the controller 130 includes a fifth switch M5 , a sixth switch M6 , a seventh switch M7 , and an eighth switch M8 connected to the second output switch 12 . In this case, the second output switch 12, the sixth switch M6, and the eighth switch M8 may be nMOSFETs, and the fifth switch M5 and the seventh switch M7 may be pMOSFETs. The control unit 130 turns on the fifth switch M5 and the seventh switch M7 when the second output switch 12 is switched to fall time. This is to adjust the slew rate at a constant rate by adjusting the current flowing through G of the second output switch 12 .

In the above, the present invention has been described with reference to the preferred embodiments described with reference to the drawings, but is not limited thereto. Therefore, the present invention should be interpreted by the description of the claims intended to cover obvious modifications that can be derived from the described examples.

10: DC-DC converter
11: 1st output switch
12: 2nd output switch
100: peak signal correction device
110: comparison unit
120: counter unit
130: control unit
140: electromagnetic wave detection unit
150: temperature sensing unit
160: communication department

Claims (5)

a comparator comparing a peak voltage of an output signal and a reference voltage of an input signal applied to the DC-DC converter;
a counter unit counting the accumulated number of times the peak voltage of the output signal exceeds the reference voltage;
an electromagnetic wave detection unit for detecting electromagnetic wave information of the output signal using an electromagnetic wave sensor;
a temperature sensing unit for sensing temperature information of the DC-DC converter; and
The slew rate of the output signal is adjusted when the accumulated number of times exceeds a preset reference number and the electromagnetic wave information of the output signal exceeds a preset allowable electromagnetic wave range, and the temperature information of the DC-DC converter is used as a standard. A peak signal compensating device of a DC-DC converter comprising a control unit that adjusts the slew rate to lower the heating temperature when the temperature exceeds the temperature. According to claim 1,
The counter part,
A peak signal compensating device of a DC-DC converter for initializing the accumulation number and newly counting the accumulation number from a second point in time when a predetermined time has elapsed from the accumulation number at a first time point. According to claim 1,
The control unit,
A peak signal compensating device of a DC-DC converter for reducing a slew rate value of the output signal when the number of times the peak voltage exceeds the reference voltage exceeds the reference number. According to claim 1,
Further comprising a communication unit for communicating with an external communication terminal,
The control unit,
A peak signal correction device of a DC-DC converter for changing the reference voltage when the reference voltage is updated from the communication terminal and changing the reference number according to the reference voltage. In the correction method of the peak signal correction device of the DC-DC converter,
a comparison step of comparing a peak voltage of an output signal of an input signal applied to the DC-DC converter with a reference voltage;
a counter step of counting the accumulated number of times the peak voltage of the output signal exceeds the reference voltage;
an electromagnetic wave sensing step of sensing electromagnetic wave information of the output signal using an electromagnetic wave sensor;
a temperature sensing step of sensing temperature information of the DC-DC converter; and
The slew rate of the output signal is adjusted when the accumulated number of times exceeds a preset reference number and the electromagnetic wave information of the output signal exceeds a preset allowable electromagnetic wave range, and the temperature information of the DC-DC converter is used as a standard. A method of correcting a peak signal of a DC-DC converter comprising a control step of adjusting the slew rate to lower the heating temperature when the temperature exceeds the peak signal.