KR102329422B1 - Energy harvesting apparatus - Google Patents

Abstract

It relates to an energy collection device capable of collecting maximum power from a plurality of energy sources, comprising: a maximum power point tracking unit for extracting a maximum power point voltage of a corresponding energy source based on an output voltage output from each energy source; The selector selects the energy source with the largest error by comparing the output voltage of It may include a maximum power collector that outputs the maximum power, and a controller that detects a selection mode from the selection unit and controls the maximum power collector according to the detected selection mode.

Description

Energy Harvesting Device {ENERGY HARVESTING APPARATUS}

The present invention relates to an energy collecting device, and more particularly, to an energy collecting device capable of collecting maximum power from a plurality of energy sources.

In general, as the energy problem becomes serious due to the depletion of fossil fuels, the development of an energy collection device for collecting and generating energy from a renewable energy source such as sunlight is accelerating.

Such an energy collecting device can obtain maximum power when the output characteristic curve of the energy source reaches the maximum power point.

However, since the maximum power point is a variable value depending on the environment of the energy source, the maximum efficiency can be obtained only by finding the maximum power point that varies according to the environmental change.

Therefore, the energy collecting device requires a maximum power point tracking (MPPT) capable of tracking the maximum power point.

In addition, although the energy collection device could obtain the maximum power from one energy source through the maximum power point tracking device, it cannot be applied to other energy sources, so there is an inefficiency in designing an energy collection device corresponding to another energy source. there was.

Therefore, there is a demand for the development of an energy collecting device that is commonly applied to a plurality of different energy sources in the future and can efficiently collect maximum power from a plurality of energy sources.

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another object is to compare the output voltage of each energy source with the extracted maximum power point voltage, and select an energy source with the largest error, and detect a selection mode from the selection unit and select the maximum value according to the detected selection mode. An object of the present invention is to provide an energy collecting device capable of efficiently collecting maximum power from a plurality of energy sources by disposing a controller for controlling the power collecting unit.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be able

The energy collection device for collecting maximum power from a plurality of energy sources according to an embodiment of the present invention is a maximum power point tracking unit for extracting the maximum power point voltage of the corresponding energy source based on the output voltage output from each energy source and a selector that selects the energy source with the largest error by comparing the output voltage of the energy source with the extracted maximum power point voltage, and adjusts the output voltage of the energy source selected from the selector to the maximum power point voltage to obtain maximum power It may include a maximum power collector that collects and outputs the collected maximum power, and a controller that detects a selection mode from the selection unit and controls the maximum power collector according to the detected selection mode.

Here, the selector includes an error amplifier that receives the output voltage and the maximum power point voltage of each energy source, amplifies and outputs an error between the input output voltage of each energy source and the maximum power point voltage, and outputs the corresponding energy source. A first comparator that compares signals output from the error amplifiers of and a second comparator for comparing an error of the energy source selected from the first selector with a minimum reference value.

In addition, the selector includes a third comparator that compares signals output from the first selectors, receives signals output from the first selectors, and selects an energy source having the largest error according to the output signal of the third comparator It may further include a second selector.

In addition, the maximum power collection unit, a first buffer unit for storing the output voltage of the selected energy source, a first switching unit for switching according to the control signal so that the voltage stored in the first buffer unit is output, and the first switching unit for switching A voltage adjusting unit for adjusting the voltage stored in the first buffer to the maximum power point voltage, a second switching unit for switching according to a control signal to output the adjusted voltage from the voltage adjusting unit, and adjusting according to the switching of the second switching unit It may include a second buffer unit for outputting the maximum power collected by storing the voltage, and a third switching unit for switching according to the control signal so that the voltage stored in the first buffer is output to the second buffer unit.

Next, when detecting the selection mode from the selection unit, the control unit may include a first selection mode in which the same energy source is continuously selected, a second selection mode in which different energy sources are consecutively selected, and a third selection mode in which a battery is continuously selected. Any one of the selection mode and the fourth selection mode in which the battery is selected only once may be detected.

Further, when controlling the maximum power collector, the controller may generate a PWM signal by adjusting a duty ratio according to the detected selection mode, and may control the voltage controller based on the generated PWM signal.

Next, the control unit includes a storage unit in which duty information corresponding to the selection mode is preset and stored, an extraction unit extracting duty information corresponding to the detected selection mode from the storage unit, and converting the extracted duty information into an analog signal. a digital-to-analog converter; a ramp signal generator for generating a ramp signal of each energy source; a first comparator for comparing an output signal of the digital-to-analog converter with an output signal of the ramp signal generator; It may include a second comparator for comparing the signal and the reference signal, and a PWM signal generating unit for generating a PWM signal by adjusting a duty ratio based on the output signals of the first and second comparators.

In addition, the present invention generates a cold start voltage based on the output voltage output from each energy source, detects whether the generated cold start voltage reaches the reference voltage, and when the cold start voltage reaches the reference voltage, the cold start voltage is It may further include a cold start unit for outputting to the control unit to turn on the control unit.

Here, the cold start unit may be turned off at the same time as turning on the control unit.

Next, the cold start unit includes an energy source voltage synthesizer that synthesizes output voltages output from each energy source, a clock signal generator that generates a clock signal based on the synthesized voltage, and a cold start voltage by boosting the generated clock signal. a cold start voltage generator generating ) may include a first switching unit for switching to be.

In addition, the cold start unit may include a second switching unit that outputs the voltage of the battery to the control unit when the cold start voltage reaches the reference voltage when the output terminal is connected to the battery and switches the control unit to turn on.

The effect of the energy collecting device according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, a selection unit for selecting an energy source having the largest error by comparing the output voltage of each energy source with the extracted maximum power point voltage, and detecting a selection mode from the selection unit, By disposing a control unit that controls the maximum power collecting unit according to the detected selection mode, it is possible to efficiently collect maximum power from a plurality of energy sources.

According to at least one of the embodiments of the present invention, it is possible to stably drive the control unit by disposing the cold start unit.

Further scope of applicability of the present invention will become apparent from the following detailed description. However, it should be understood that the detailed description and specific embodiments such as preferred embodiments of the present invention are given by way of illustration only, since various changes and modifications within the spirit and scope of the present invention may be clearly understood by those skilled in the art.

1 is a block diagram illustrating an energy collecting device according to the present invention.
2 is a block diagram showing the arrangement relationship between a plurality of energy sources and a maximum power point tracking unit according to the first embodiment of the present invention.
3 is a block diagram showing the arrangement relationship between a plurality of energy sources and a maximum power point tracking unit according to a second embodiment of the present invention.
FIG. 4 is a circuit diagram showing a selection unit of FIG. 1 .
5 is a clock timing diagram of a selection unit.
FIG. 6 is a circuit diagram showing the maximum power collector of FIG. 1 .
FIG. 7 is a circuit diagram illustrating a control unit of FIG. 1 .
8 is a timing diagram illustrating generation of a PMW signal.
9 is a circuit diagram illustrating a maximum power collection unit including a cold start unit.
FIG. 10 is a circuit diagram showing the cold start unit of FIG. 9 .
11 is a circuit diagram illustrating an energy source voltage synthesizer of FIG. 10 .
FIG. 12 is a circuit diagram showing the detection unit of FIG. 10 .

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

1 is a block diagram illustrating an energy collecting device according to the present invention.

As shown in FIG. 1 , the energy collecting device according to the present invention may collect maximum power from a plurality of energy sources 100 .

Here, the plurality of energy sources 100 may be different energy sources.

For example, the plurality of energy sources 100 include a first energy source 110 such as a solar energy source, a second energy source 120 such as a radio frequency (RF) signal energy source, and a second energy source such as a vibration energy source. The third energy source 130 may include a fourth energy source 140 such as a battery, but is not limited thereto.

In addition, the energy collection device may include a maximum power point tracking unit 200 , a selection unit 300 , a maximum power collection unit 400 , and a control unit 500 .

The maximum power point collection unit 200 may extract the maximum power point voltage of the corresponding energy source based on the output voltage output from each energy source.

Here, the maximum power point tracking unit 200 may be plural, and may be disposed in a one-to-one correspondence with each energy source 100 .

For example, the number of maximum power point tracking units 200 may be the same as the number of energy sources 100 .

For example, if the maximum power point tracker 200 includes a first maximum power point tracker, a second maximum power point tracker, a third maximum power point tracker, and a fourth maximum power point tracker, the first maximum power point tracker corresponds to the first energy source and extracts the maximum power point of the first energy source, the second maximum power point tracker extracts the maximum power point of the second energy source corresponding to the second energy source, and the third maximum power The point tracker may extract a maximum power point of the third energy source corresponding to the third energy source, and the fourth maximum power point tracker may extract a maximum power point of the fourth energy source corresponding to the fourth energy source.

In this case, the maximum power point tracking unit 200 can simultaneously extract the maximum power point voltage for a plurality of energy sources, so that the maximum power can be collected at a high speed.

As another example, the maximum power point tracking unit 200 may be disposed to correspond to a plurality of energy sources.

Here, the number of the maximum power point tracking unit 200 may be less than the number of the plurality of energy sources 100 .

For example, if the maximum power point tracker 200 includes one maximum power point tracker, the maximum power point tracker is electrically connected to the first, first, third, and fourth energy sources corresponding to the first, first , the maximum power points of the second, third, and fourth energy sources may be extracted.

In this case, the maximum power point tracking unit 200 may sequentially extract the maximum power point voltage for a plurality of energy sources. Since only one maximum power point tracker is used, the circuit design is simple and the manufacturing cost is reduced. can have an effect.

Next, the selector 300 may select the energy source having the largest error by comparing the output voltage of the energy source 100 with the extracted maximum power point voltage.

At this time, the reason why the selection unit 300 selects the energy source with a large error is that, among a plurality of energy sources, the energy source with the largest error is preferentially collected to maximize the maximum power collection time and efficiency. because it can

Here, the selector 300 may include an error amplifier, a first comparator, a first selector, and a second comparator.

The error amplifier may receive the output voltage and the maximum power point voltage of each energy source, and amplify and output an error between the input output voltage of each energy source and the maximum power point voltage.

Next, the first comparator may compare signals output from the error amplifiers corresponding to each energy source.

Next, the first selector may receive signals output from the error amplifiers corresponding to each energy source, and select an energy source having the largest error according to the output signal of the first comparator.

The second comparator may compare the error of the energy source selected by the first selector with the minimum reference value.

In some cases, the selector 300 may further include a third comparator and a second selector.

Here, the third comparator compares the signals output from the first selectors, the second selector receives the signals output from the first selectors, and the energy having the largest error according to the output signal of the third comparator You can choose a circle.

For example, when recognizing that the error of the energy source is smaller than the minimum reference value based on the signal output from the second comparator of the selection unit 300 , the controller 500 may select the battery instead of selecting the energy source.

Next, the maximum power collection unit 400 may adjust the output voltage of the energy source selected by the selection unit 300 to the maximum power point voltage to collect the maximum power and output the collected maximum power.

For example, the maximum power collection unit 400 may be a dc-dc converter driven according to a control signal of the control unit 500 .

The maximum power collection unit 400, the first buffer unit for storing the output voltage of the selected energy source, the first switching unit for switching according to the control signal so that the voltage stored in the first buffer unit is output, the switching of the first switching unit A voltage control unit that adjusts the voltage stored in the first buffer to the maximum power point voltage, a second switching unit that switches according to a control signal so that the adjusted voltage is output from the voltage control unit, a voltage adjusted according to the switching of the second switching unit It may include a second buffer unit for outputting the maximum power collected by storing , and a third switching unit for switching according to the control signal so that the voltage stored in the first buffer is output to the second buffer unit.

Here, the third switching unit may store the voltage stored in the first buffer in the second buffer to be switched to be output to the battery.

In addition, the control unit 500 may detect the selection mode from the selection unit 300 and control the maximum power collection unit 400 according to the detected selection mode.

Here, when detecting the selection mode from the selection unit 300, the control unit 500, a first selection mode in which the same energy source is continuously selected, a second selection mode in which different energy sources are continuously selected, and the battery Any one of a third selection mode continuously selected and a fourth selection mode in which the battery is selected only once may be detected, but the present invention is not limited thereto.

Then, when controlling the maximum power collecting unit 400, the controller 500 generates a PWM signal by adjusting a duty ratio according to the detected selection mode, and based on the generated PWM signal, the voltage adjusting unit can be controlled

For example, when the detected selection mode is a mode in which the same energy source is continuously selected or a mode in which a battery is continuously selected, the control unit 500 may increase the duty ratio of the PWM signal.

Also, when the detected selection mode is a mode in which different energy sources are continuously selected or a mode in which a battery is selected only once, the control unit 500 may reduce the duty ratio of the PWM signal.

In some cases, when adjusting the duty ratio according to the detected selection mode, the controller 500 may adjust the duty ratio based on a preset value stored in which a duty ratio corresponding to the selection mode is preset.

As described above, in the present invention, since the control unit 500 controls the maximum power collection unit 400 by adjusting the duty ratio according to the selection mode, it is possible to maximize the maximum power collection time and efficiency.

For example, the controller 500 may include a storage unit in which duty information corresponding to the selection mode is preset and stored, an extraction unit that extracts duty information corresponding to the detected selection mode from the storage unit, and converts the extracted duty information into an analog signal. A digital-to-analog converter for converting, a ramp signal generator for generating a ramp signal of each energy source, a first comparison section for comparing an output signal of the digital-analog converter with an output signal of the ramp signal generator, and a ramp signal of each energy source and a second comparator comparing the reference signal with the reference signal, and a PWM signal generating unit generating a PWM signal by adjusting a duty ratio based on the output signals of the first and second comparators.

In some cases, the present invention may further include a cold start (cold start) unit.

Here, the cold start unit generates a cold start voltage based on the output voltage output from each energy source, detects whether the generated cold start voltage reaches the reference voltage, and when the cold start voltage reaches the reference voltage, the cold start voltage is It can be output to the control unit to turn on the control unit.

In addition, the cold start unit may be turned off at the same time that the control unit 500 is turned on.

Therefore, in the present invention, by arranging the cold start unit, the control unit 500 can be stably driven.

For example, the cold start unit may output the voltage of the battery to the controller 500 to turn on the controller 500 when the cold start voltage reaches the reference voltage when the output terminal is connected to the battery.

For example, the cold start unit includes an energy source voltage synthesis unit that synthesizes output voltages output from each energy source, a clock signal generation unit that generates a clock signal based on the synthesized voltage, and a cold start voltage by boosting the generated clock signal. a cold start voltage generator generating ) may include a first switching unit for switching to be on (on).

Here, the first switching unit may switch the control unit 500 to be turned on (on) and at the same time to turn the cold start unit off (off).

And, the cold start unit, when the output terminal is connected to the battery, when the cold start voltage reaches the reference voltage, output the voltage of the battery to the control unit 500 to include a second switching unit to switch the control unit 500 is turned on. .

In addition, the clock signal generating unit of the cold start unit may be a ring oscillator, but is not limited thereto.

2 is a block diagram showing the arrangement relationship between a plurality of energy sources and the maximum power point tracking unit according to the first embodiment of the present invention, and FIG. 3 is a plurality of energy sources and maximum power according to the second embodiment of the present invention. It is a block diagram showing the arrangement relationship with the point tracking unit.

As shown in FIG. 2 , the maximum power point collection unit 200 may extract the maximum power point voltage of the corresponding energy source based on the output voltage output from each energy source, and the maximum power point tracking unit 200 ) may be multiple, and may be arranged in a one-to-one correspondence with each energy source 100 .

Here, the number of the maximum power point tracking unit 200 may be the same as the number of energy sources 100 .

For example, the maximum power point tracker 200 may include a first maximum power point tracker 201 , a second maximum power point tracker 202 , a third maximum power point tracker 203 , a fourth maximum power point tracker ( 204 ), the first maximum power point tracker 201 extracts the maximum power point of the first energy source 110 corresponding to the first energy source 110 , and the second maximum power point tracker 202 . extracts the maximum power point of the second energy source 120 corresponding to the second energy source 120 , and the third maximum power point tracker 203 corresponds to the third energy source 130 and the third energy source The maximum power point of 130 is extracted, and the fourth maximum power point tracker 204 may extract the maximum power point of the fourth energy source 140 in response to the fourth energy source 140 .

In this case, the maximum power point tracking unit 200 can simultaneously extract the maximum power point voltage for a plurality of energy sources, so that the maximum power can be collected at a high speed.

In addition, as shown in FIG. 3 , the maximum power point tracking unit 200 may be disposed to correspond to a plurality of energy sources.

Here, the number of the maximum power point tracking unit 200 may be less than the number of the plurality of energy sources 100 .

For example, if the maximum power point tracker 200 includes one maximum power point tracker, the maximum power point tracker may be connected to the first, first, third, and fourth energy sources 110 , 120 , 130 , 140 . Correspondingly, the maximum power points of the first, second, third, and fourth energy sources 110 , 120 , 130 , and 140 may be extracted.

In this case, the maximum power point tracking unit 200 may sequentially extract the maximum power point voltage for a plurality of energy sources. Since only one maximum power point tracker is used, the circuit design is simple and the manufacturing cost is reduced. can have an effect.

FIG. 4 is a circuit diagram showing the selector of FIG. 1 , and FIG. 5 is a clock timing diagram of the selector.

4 and 5, the selection unit 300 of the energy collection device according to the present invention compares the output voltage (Vbuffer) of the energy source 100 and the extracted maximum power point voltage (Vmpp) The energy source with the largest error can be selected.

At this time, the reason why the selection unit 300 selects the energy source with a large error is that, among a plurality of energy sources, the energy source with the largest error is preferentially collected to maximize the maximum power collection time and efficiency. because it can

Here, the selector 300 may include an error amplifier 310 , a first comparator 320 , a first selector 330 , and a second comparator 340 .

For example, the error amplifier 310 receives an output voltage (Vbuffer) and a maximum power point voltage (Vmpp) of each energy source, and amplifies an error between the output voltage of each input energy source and the maximum power point voltage. can be printed out.

Next, the first comparator 320 may compare signals output from the error amplifiers 310 corresponding to each energy source.

Next, the first selector 330 receives signals output from the error amplifiers 310 corresponding to each energy source, and selects an energy source having the largest error according to the output signal of the first comparator 320 . can

In addition, when the third comparator 350 and the second selector 360 do not exist and only the first selector 330 exists, the second comparator 340 has an error and the minimum reference value of the energy source selected from the first selector 330 . can be compared.

In some cases, the selector 300 may further include a third comparator 350 and a second selector 360 .

Here, the third comparator 350 compares signals output from the first selectors 330 , and the second selector 360 receives the signals output from the first selectors 330 , and receives the third An energy source having the largest error may be selected according to the output signal of the comparator 350 .

In this case, when the third comparator 350 and the second selector 360 exist, the second comparator 340 may compare the error of the energy source selected from the second selector 360 with the minimum reference value.

For example, if the control unit 500 recognizes that the error of the energy source is smaller than the minimum reference value based on the signal output from the second comparator 340 of the selection unit 300, the battery may be selected instead of the selection of the energy source. .

FIG. 6 is a circuit diagram showing the maximum power collector of FIG. 1 .

As shown in FIG. 6 , the maximum power collection unit 400 adjusts the output voltage of the energy source selected by the selection unit 300 to the maximum power point voltage to collect the maximum power and output the collected maximum power. have.

For example, the maximum power collection unit 400 may be a dc-dc converter driven according to a control signal of the control unit 500 .

The maximum power collection unit 400 includes a first buffer unit 410 , a first switching unit 420 , a voltage adjusting unit 430 , a second switching unit 440 , a second buffer unit 450 , and a second 3 may include a switching unit 460 .

Here, the first buffer unit 410 may store the output voltage of the selected energy source.

In addition, the first switching unit 420 may switch according to the control signal so that the voltage stored in the first buffer unit 410 is output.

Then, the voltage adjusting unit 430 may adjust the voltage stored in the first buffer unit 410 to the maximum power point voltage according to the switching of the first switching unit 420 .

Next, the second switching unit 440 may switch according to the control signal so that the voltage adjusted from the voltage adjusting unit 430 is output.

In addition, the second buffer unit 450 may output the maximum power collected by storing the voltage adjusted according to the switching of the second switching unit 460 .

Next, the third switching unit 460 may switch according to the control signal so that the voltage stored in the first buffer unit 410 is output to the second buffer unit 450 .

Here, the third switching unit 460 may store the voltage stored in the first buffer unit 410 in the second buffer unit 450 to be switched to be output to the battery.

7 is a circuit diagram illustrating the control unit of FIG. 1 , and FIG. 8 is a timing diagram illustrating PMW signal generation.

7 and 8 , the controller 500 may detect a selection mode from the selection unit and control the maximum power collection unit according to the detected selection mode.

Here, when the control unit 500 detects the selection mode from the selection unit, the first selection mode in which the same energy source is continuously selected, the second selection mode in which different energy sources are continuously selected, and the battery are continuously selected Any one of the third selection mode in which the battery is selected and the fourth selection mode in which the battery is selected only once may be detected, but is not limited thereto.

Then, when controlling the maximum power collector, the controller 500 may generate a PWM signal by adjusting a duty ratio according to the detected selection mode, and control the voltage controller based on the generated PWM signal. .

For example, when the detected selection mode is a mode in which the same energy source is continuously selected or a mode in which a battery is continuously selected, the control unit 500 may increase the duty ratio of the PWM signal.

Also, when the detected selection mode is a mode in which different energy sources are continuously selected or a mode in which a battery is selected only once, the control unit 500 may reduce the duty ratio of the PWM signal.

In some cases, when adjusting the duty ratio according to the detected selection mode, the controller 500 may adjust the duty ratio based on a preset value stored in which a duty ratio corresponding to the selection mode is preset.

As described above, in the present invention, since the control unit 500 controls the maximum power collection unit 400 by adjusting the duty ratio according to the selection mode, the maximum power collection time and efficiency can be maximized.

7 and 8 , the control unit 500 includes a storage unit 510 , an extraction unit 520 , a digital-to-analog converter 530 , a ramp signal generation unit 540 , and a first comparison unit 550 . , a second comparator 560 , and a PWM signal generator 570 .

Here, the storage unit 510 may store duty information corresponding to the selection mode set in advance.

In addition, the extractor 520 may extract duty information corresponding to the detected selection mode from the storage 510 .

Next, the digital-to-analog converter 530 may convert the extracted duty information into an analog signal, and the digital-to-analog converter and the ramp signal generator 540 may generate a ramp signal of each energy source. can

Next, the first comparator 550 compares the output signal of the digital-to-analog converter 530 with the output signal of the ramp signal generator 540 , and the second comparator 560 , A ramp signal and a reference signal can be compared.

In addition, the PWM signal generator 570 may generate a PWM signal by adjusting a duty ratio based on the output signals of the first and second comparators 550 and 560 .

9 is a circuit diagram showing a maximum power collecting unit including a cold start unit, FIG. 10 is a circuit diagram showing a cold start unit of FIG. 9, FIG. 11 is a circuit diagram showing the energy source voltage synthesis unit of FIG. It is a circuit diagram showing the detection unit.

9 to 12 , the maximum power collecting unit of the present invention may further include a cold start unit 600 .

Here, the cold start unit 600 generates a cold start voltage based on the output voltage output from each energy source, detects whether the generated cold start voltage reaches the reference voltage, and when the cold start voltage reaches the reference voltage, The cold start voltage may be output to the controller to turn on the controller.

In addition, the cold start unit 600 may be turned off at the same time as turning on the control unit.

Therefore, in the present invention, by arranging the cold start unit 600, it is possible to stably drive the control unit.

For example, the cold start unit 600 may output the voltage of the battery to the controller when the cold start voltage reaches the reference voltage when the output terminal is connected to the battery to turn on the controller.

For example, as shown in FIG. 10 , the cold start unit 600 includes an energy source voltage synthesis unit 630 , a clock signal generation unit 640 , a cold start voltage generation unit 650 , a detection unit 660 , and a switching control unit. 670 , and a first switching unit 620 .

Here, the energy source voltage synthesizer 630 may synthesize output voltages output from each energy source, and the clock signal generator 640 may generate a clock signal based on the synthesized voltage.

Next, the cold start voltage generator 650 may generate a cold start voltage by boosting the generated clock signal, and the detector 660 detects whether the generated cold start voltage reaches a reference voltage, and the switching controller When the cold start voltage from the detection unit 660 reaches the reference voltage, the 670 outputs the cold start voltage to the control unit to control the first switching unit 620 so that the control unit is turned on.

Next, the first switching unit 620 may output a cold start voltage to the control unit according to the control signal of the switching control unit 670 to switch the control unit to be turned on.

Here, the first switching unit 620 may switch the cold start unit 600 so that the control unit is turned on and at the same time the cold start unit 600 is turned off.

And, the cold start unit 600, when the output terminal is connected to the battery, when the cold start voltage reaches the reference voltage, output the voltage of the battery to the control unit to include a second switching unit 610 for switching so that the control unit is turned on can

Here, the switching control unit 670 of the cold start unit 600 may control the second switching unit 610 to turn on the control unit by outputting the voltage of the battery to the control unit when the cold start voltage reaches the reference voltage.

Also, the clock signal generating unit 640 of the cold start unit 600 may be a ring oscillator, but is not limited thereto.

In this way, the present invention compares the output voltage of each energy source with the extracted maximum power point voltage and selects an energy source with the largest error, and detects a selection mode from the selection unit and adds the selected mode to the detected selection mode. Accordingly, by disposing a control unit for controlling the maximum power collecting unit, it is possible to efficiently collect maximum power from a plurality of energy sources.

And, according to the present invention, it is possible to stably drive the control unit by arranging the cold start unit.

Above, it is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

The present invention described above can be implemented as computer-readable code on a medium in which a program is recorded. The computer-readable medium includes all kinds of recording devices in which data readable by a computer system is stored. Examples of the computer-readable medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc., and may also be implemented in the form of a carrier wave (eg, transmission over the Internet). also includes In addition, the computer may include a control unit of the terminal.

Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

100: energy source
200: maximum power point tracking unit
300: selection
400: maximum power collector
500: control

Claims (15)

An energy collection device for collecting maximum power from a plurality of energy sources, comprising:
a maximum power point tracking unit for extracting a maximum power point voltage of each energy source based on an output voltage output from each energy source;
a selection unit for selecting an energy source having the largest error by comparing the output voltage of the energy source with the extracted maximum power point voltage;
a maximum power collecting unit for collecting maximum power by adjusting the output voltage of the energy source selected by the selection unit to the maximum power point voltage and outputting the collected maximum power; and,
a control unit for detecting a selection mode from the selection unit and controlling the maximum power collection unit according to the detected selection mode;
The control unit is
When the maximum power collection unit is controlled, a PWM signal is generated by adjusting a duty ratio according to the detected selection mode, and the voltage control unit is controlled based on the generated PWM signal. . According to claim 1, wherein the selection unit,
an error amplifier receiving the output voltage and the maximum power point voltage of each of the energy sources, and amplifying and outputting an error between the input output voltage of each energy source and the maximum power point voltage;
a first comparator for comparing signals output from the error amplifiers corresponding to the respective energy sources;
a first selector receiving signals output from the error amplifiers corresponding to the respective energy sources and selecting an energy source having the largest error according to the output signal of the first comparator; and,
and a second comparator for comparing the error of the energy source selected from the first selector with a minimum reference value. According to claim 2, wherein the selection unit,
a third comparator for comparing signals output from the first selectors; and,
and a second selector receiving signals output from the first selectors and selecting an energy source having the largest error according to the output signal of the third comparator. According to claim 3, wherein the control unit,
When it is recognized that the error of the energy source is smaller than the minimum reference value based on the signal output from the second comparator, the battery is selected instead of the energy source. According to claim 1, wherein the maximum power collection unit,
a first buffer unit for storing the output voltage of the selected energy source;
a first switching unit for switching according to a control signal so that the voltage stored in the first buffer unit is output;
a voltage adjusting unit for adjusting the voltage stored in the first buffer to a maximum power point voltage according to the switching of the first switching unit;
a second switching unit for switching according to the control signal so that the voltage adjusted from the voltage control unit is output;
a second buffer unit for outputting the maximum power collected by storing the voltage adjusted according to the switching of the second switching unit; and,
and a third switching unit for switching according to the control signal so that the voltage stored in the first buffer is output to the second buffer unit. The method of claim 5, wherein the third switching unit,
Energy collecting device, characterized in that the voltage stored in the first buffer is stored in the second buffer and switched to be output to the battery. delete According to claim 1, wherein the control unit,
When the detected selection mode is a mode in which the same energy source is continuously selected or a mode in which a battery is continuously selected, the duty ratio of the PWM signal is increased. According to claim 1, wherein the control unit,
When the detected selection mode is a mode in which different energy sources are continuously selected or a mode in which a battery is selected only once, the energy collecting device according to claim 1 , wherein the duty ratio of the PWM signal is reduced. According to claim 1, wherein the control unit,
When a duty ratio is adjusted according to the detected selection mode, a duty ratio corresponding to the selection mode is preset and the duty ratio is adjusted based on a stored setting value. delete delete delete delete delete

Images