KR101746949B1 - Power combination device of multiple small power sources and generation method of control signal therefor - Google Patents

Power combination device of multiple small power sources and generation method of control signal therefor Download PDF

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KR101746949B1
KR101746949B1 KR1020150136044A KR20150136044A KR101746949B1 KR 101746949 B1 KR101746949 B1 KR 101746949B1 KR 1020150136044 A KR1020150136044 A KR 1020150136044A KR 20150136044 A KR20150136044 A KR 20150136044A KR 101746949 B1 KR101746949 B1 KR 101746949B1
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South Korea
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power
control signal
power sources
output
generating
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KR1020150136044A
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Korean (ko)
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KR20170037015A (en
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황병창
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(주)이젝스
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
    • H02J7/022—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H02N2/181—Circuits; Control arrangements or methods
    • H02M2001/0067—
    • H02M2001/0077—

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A power source unit including N power sources; A power combiner for combining and outputting DC power from the N power sources; And a control unit for generating a control signal for controlling the operation of the power combining unit by using an output voltage of the N power sources or a voltage of an internal node included in the N power sources (A) an output voltage from one of the N power sources, or a voltage of an internal node included in one of the N power sources, from an analog signal to a digital signal Converting; (b) waking up after entering a standby mode for a predetermined time; (c) if the wake-up in step (b) is a wake-up from the standby mode, determining whether the converted digital signal of step (a) meets predetermined conditions; And generating a control signal for causing an output of the power source to be output to the power combining unit when the converted digital signal meets predetermined conditions as a result of the determination in step (c) And N is a natural number of 2 or more.

Figure R1020150136044

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power combiner for a plurality of weak power sources and a method for generating the control signal.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power combining apparatus for a plurality of weak power sources and a method of generating the control signal. More particularly, To a power combining apparatus for a plurality of weak power sources and a method of generating the control signal.

Piezoelectric elements using piezo are characterized by generating a small amount of electrical energy when external pressure and / or vibration is applied. On the other hand, when an AC voltage is applied to an electrode of a piezoelectric element using a piezo, vibrations are generated, which is often referred to as a piezo buzzer. In other words, a piezoelectric device using a piezo can be regarded as a voltage-force interaction.

However, the power that can be obtained from a piezoelectric device using a piezoelectric device is limited to a specific field of low power sensor because the electric power obtained from the piezoelectric device obtains a small power of about several mW even after various mechanical design and tuning.

Even in the case of low power sensor applications, since a considerable amount of power may be needed for a short period of time in order to transmit the sensor data, there is a problem in that continuous power consumption can be limited only to piezoelectric elements using piezo.

In addition to piezoelectric elements using piezo, it is possible to produce and store energy other than vibration through solar power generation and secondary battery charging. However, in the case of photovoltaic power generation, there are concerns about unit price and life span, Even if the battery is helpful for the storage of energy, it is not related to the power generation, so it is difficult to apply to the application where the critical power is required.

An object of the present invention is to solve the technical problems described above, and it is an object of the present invention to provide a power combining apparatus of a plurality of weak power sources capable of outputting a larger power by combining powers of a plurality of weak power sources, And to provide a method of generating the same.

A power source unit including N power sources; A power combiner for combining and outputting DC power from the N power sources; And a control unit for generating a control signal for controlling the operation of the power combining unit by using an output voltage of the N power sources or a voltage of an internal node included in the N power sources (A) an output voltage from one of the N power sources or an output voltage from an internal node included in a power source of one of the N power sources, the control signal generating method comprising: Converting an analog signal into a digital signal; (b) waking up after entering a standby mode for a predetermined time; (c) if the wake-up in step (b) is a wake-up from the standby mode, determining whether the converted digital signal of step (a) meets predetermined conditions; (d) generating a control signal to output an output of the power source to the power combiner when the converted digital signal meets predetermined conditions as a result of the determination in step (c); And (e) selecting a next power source, wherein N is a natural number of 2 or more. In addition, the method of generating the control signal may return to step (a) after step (e). Preferably, the method further includes the step of initializing the control unit when the wake-up in the step (b) is a wake-up from an abnormal state.

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The predetermined condition of the step (c) may be that the voltage slope of the digital signal converted in the step (a) is positive; And a voltage level of the digital signal converted in the step (a) is equal to or greater than a preset constant value.

According to the power combiner of the present invention and the method of generating the control signal of the present invention, a larger power can be output by combining the powers of a plurality of weak power sources.

1 is a configuration diagram of a power generation device using a general piezoelectric element.
2 is a configuration diagram of a simple power combining device of a weak power source.
3 is a configuration diagram of a plurality of weak power source power combining apparatuses according to a first preferred embodiment of the present invention.
4 is an exemplary circuit diagram of a power combining section;
FIG. 5 is a configuration diagram of a plurality of weak power source power combining apparatuses according to a second preferred embodiment of the present invention. FIG.
FIG. 6 is a flowchart of a method of generating a control signal by a controller of a plurality of weak power source power combining apparatuses according to a second preferred embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description will be given of a plurality of weak power source power combining apparatuses and a control signal generating method thereof according to embodiments of the present invention with reference to the accompanying drawings.

It should be understood that the following embodiments of the present invention are only for embodying the present invention and do not limit or limit the scope of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

First, Fig. 1 shows a configuration diagram of a power generation apparatus PG using a general piezoelectric element.

1, in the case of a power generation device PG using a general piezoelectric element, the electric power from the piezoelectric element PZ is full-wave rectified in the rectifier RT to charge the capacitor in the rectifier RT, and the DC- Converts the DC voltage charged in the capacitor to a DC voltage and outputs the DC voltage.

However, when such a single piezoelectric element PZ is used, a high power output can not be obtained, so that practical application fields are extremely limited.

For a wireless sensor that can be used when only one piezoelectric element (PZ) is used, it is necessary to send several tens of bytes of sensor data about once a minute and to use the standby mode or sleep mode for the remaining time And so on.

Zigbee and WiFi, which are expected to have more applications, can be operated in such a way that the operation time of the sensor is reduced and the power is collected for the remaining time. I can not help but drop the utilization rate.

2 is a configuration diagram of a simple power combining apparatus 100 of a weak power source.

The power combiners 100 of the weak power sources of FIG. 2 are formed by simply connecting the power source 111, which is a modularized power generator PG using the general piezoelectric elements of FIG. 1, in parallel.

2, the power source 111 having the largest power generation amount among the various power sources 111 or having the smallest source impedance with respect to the load is connected to the other power sources 111, It is expected to be difficult to collect and use small powers.

In other words, if energy sources having different power quantities are directly connected to each other, a problem arises in which a source having a large energy or a low impedance masks / blocks the remaining sources or consumes energy. Here, the phase difference of the generated voltage and current, the impedance difference of the energy source, and the like influence. Therefore, it is necessary to find a method of reducing power waste by effectively adding (canceling) the power obtained from a plurality of power generation modules without canceling each other.

FIG. 3 is a configuration diagram of a plurality of weak power source power combining apparatuses 200 according to a first preferred embodiment of the present invention.

3, a plurality of weak power source power combining apparatuses 200 according to the first preferred embodiment of the present invention includes a power source unit 210, a controller 220, and a power combiner 230, .

The power source unit 210 includes N power sources 211.

Each power source 211 generates electric energy using the piezoelectric element PZ, rectifies the generated electric energy by the full-wave rectifier RT, charges the capacitor, and supplies the charged DC voltage to the DC - Converts DC voltage from DC converter (CONV) and outputs it.

The control unit 220 generates a control signal for controlling the operation of the power combiner 230 using the output voltages of the N power sources 211 or the voltages of the internal nodes included in the N power sources 211 It plays a role.

3, the controller 220 uses the voltages of the internal nodes included in the N power sources 211. [ Specifically, the internal node included in the N power sources 211 may be a charging node by a capacitor before the DC-DC converter (CONV).

Specifically, the control unit 220 includes N controllers 221 for detecting the voltages of the output nodes of the respective power sources 211 or the internal nodes of the respective power sources 211. In addition, each controller 221 may be configured in hardware, including a differentiator and a comparator.

Each controller 221 detects the slope of the voltage using a differentiator and determines whether the detected slope of the voltage is positive. Each of the controllers 221 detects the output level of the voltage using a comparator and outputs the output of the corresponding power source 211 having the detected voltage level equal to or higher than a preset constant value to the power combiner 230 And generates a control signal. That is, the control signal may be an enable signal for allowing the power combiner 230 to output the output signal, or a disable signal for preventing the power combiner 230 from outputting the output signal. have. Here, the positive slope means that the power source 211 is charged.

The power combiner 230 combines the DC power sources output from the N power sources 211 and outputs the combined power.

4 is an exemplary circuit diagram of the power combiner 230. In FIG.

As can be seen from FIG. 4, the power combining section 230 includes N power output devices 231.

Each of the power output devices 231 receives a control signal for controlling the output of the power source 211 by the control unit 220. However, even if the control unit 220 receives a control signal for outputting the output of the power source 211, at least one of the N-1 power sources 211 whose output level is different from the power source 211 The output of the power source 211 is not output to the power output unit 231. [ The control unit 220 receives a control signal for outputting the output of the power source 211 and outputs the control signal to the control unit 220 so that the output level of the power source 211 is lower than the output level of the The output of the power source 211 is output to the power output unit 231. [ That is, the plurality of control signals may be enabled by enabling each of the power output devices 231 to output an output signal, or by a disable signal that prevents each of the power output devices 231 from outputting an output signal .

As a result, the power combining unit 230 outputs the control signal to the power combining unit 230 by the control unit 220 among the N power sources 211, And outputs the corresponding power source 211 if it is larger than the output level of the other (N-1) power sources 211.

By using the two components of the control signal and the output level, the power combining unit 230 outputs the most suitable power source 211 to charge the connected battery.

FIG. 5 is a configuration diagram of a plurality of weak power source power combining apparatuses 300 according to a second preferred embodiment of the present invention.

A plurality of weak power source power combining apparatuses 300 according to a second preferred embodiment of the present invention may include a plurality of weak power source power combining apparatuses 300 according to the first preferred embodiment of the present invention 200 of the present invention.

However, the control unit 320 of the plurality of weak power source power combining apparatuses 300 according to the second preferred embodiment of the present invention is realized by software using a microcomputer.

In the case of a hardware circuit such as the control unit 220 of the plurality of weak power supply power combining apparatuses 200 according to the first preferred embodiment of the present invention, when the power generation amount of the specific power source 211 is high, Bias) and the load is too large for the piezoelectric elements PZ, the battery connected to the power combiner 230 may not be properly charged and may be depleted.

In order to overcome the above-mentioned problem, the control unit 320 of the plurality of weak power supply power combining apparatuses 300 according to the second preferred embodiment of the present invention includes a microcomputer having a low-power analog-to- To control the charge and discharge according to the load while performing the functions in software.

Using the microcomputer, the charge performed by each power source 311 can be distributed uniformly according to the charged amount, and monitoring of the load becomes possible.

5, a plurality of weak power source power combining apparatus 300 according to the second preferred embodiment of the present invention includes a power source unit 310, a control unit 320, and a power combining unit 330, .

The power source unit 310 includes N power sources 311. [

Each power source 311 generates electric energy by using the piezoelectric element PZ, rectifies the generated electric energy by the full-wave rectifier RT, charges the capacitor, and supplies the charged DC voltage to the DC - Converts DC voltage from DC converter (CONV) and outputs it.

The control unit 320 generates a control signal for controlling the operation of the power combiner 330 using the output voltages of the N power sources 311 or the voltages of the internal nodes included in the N power sources 311 It plays a role. However, in FIG. 5, the controller 320 is illustrated as using the voltages of the internal nodes included in the N power sources 311. Specifically, the internal node included in the N power source 311 is a charging node by a capacitor before the DC-DC converter (CONV).

The power combining unit 330 combines the DC power sources output from the N power sources 311 and outputs the combined power. The operation of the specific power combiner 330 is the same as that of the power combiner 230 of the first embodiment shown in FIG. However, since the control unit 320 divides the timings and outputs the control signals to the respective power output units 331, the power combining unit 330 of the second embodiment can output control signals for the respective power output units 331, Output line.

6 is a flowchart illustrating a method of generating a control signal by the controller 320 of a plurality of weak power supply apparatuses 300 according to a second preferred embodiment of the present invention.

6, the control signal generation method by the control unit 320 is a method of generating control signals by controlling the output voltage from one power source 311 of the N power sources 311 or one of the N power sources 311 (S10) of converting the voltage of the internal node included in the power source 311 of the power source 311 from an analog signal to a digital signal, entering a standby mode for a predetermined time, and then waking up (S20) If it is determined in step S30 that the wakeup in step S20 is a wakeup from an abnormal state such as a watchdog or a brownout and a determination in step S30 is that the wakeup in step S20 is a watchdog (S40) if the wake-up from an abnormal state such as a brown-out or brownout is initiated.

If the wake-up in step S20 is a wakeup from the standby mode as a result of the determination in step S30, the control unit 320 determines whether the digital signal converted in step S10 meets predetermined conditions A step S50 of generating a control signal for causing the power source 311 to output to the power combiner 330 when the converted digital signal meets predetermined conditions as a result of the determination in step S50 (S70) of generating a control signal to prevent the power source 311 from being output to the power combining unit 330 when the converted digital signal does not meet predetermined conditions as a result of the determination in step S50, .

The method of generating the control signal by the control unit 320 may further include a step S80 of selecting the next power source 311 after step S60 or step S70. The method for generating the control signal by the control unit 320 is characterized by returning to step S10 after step S80.

Specifically, it is preferable that the predetermined condition of step S50 includes that the voltage slope of the digital signal converted in step S10 is positive and that the voltage level of the digital signal converted in step S10 is equal to or greater than a preset constant value.

Here, the slope of the voltage can be calculated by specifying the voltage at predetermined time intervals.

As described above, according to the power combining apparatuses 200 and 300 of the present invention and the method of generating the control signal thereof, by combining the powers of a plurality of weak power sources, .

100: Simple combination of a plurality of weak power sources
200, 300: power combining device of a plurality of weak power sources of the present invention
110, 210, 310: power source unit 220, 320:
230, 330: power combination unit
111, 211, 311: power source 221, 321:
231, 331: a power output device
PG: Power Generation Device Using Piezoelectric Element PZ: Piezoelectric Element
RT: Rectifier CONV: DC-DC converter

Claims (8)

delete delete delete A power source unit including N power sources; A power combiner for combining and outputting DC power from the N power sources; And a control unit for generating a control signal for controlling the operation of the power combining unit by using an output voltage of the N power sources or a voltage of an internal node included in the N power sources A method for generating a control signal,
(a) converting an output voltage from one of the N power sources or a voltage of an internal node included in a power source of one of the N power sources from an analog signal to a digital signal;
(b) waking up after entering a standby mode for a predetermined time;
(c) if the wake-up in step (b) is a wake-up from the standby mode, determining whether the converted digital signal of step (a) meets predetermined conditions; And
(d) generating a control signal for causing an output of the power source to be output to the power combiner when the converted digital signal meets predetermined conditions as a result of the determination in step (c)
Wherein the N is a natural number of 2 or more. 5. The method of claim 4,
The method of generating the control signal may further include, after the step (d)
(e) selecting a next power source. < Desc / Clms Page number 19 > 6. The method of claim 5,
The method of generating a control signal includes:
And returning to the step (a) after the step (e). 5. The method of claim 4,
The method of generating a control signal includes:
Further comprising the step of initializing the control unit when the wake-up in the step (b) is a wake-up from an abnormal state. 5. The method of claim 4,
The predetermined condition of the step (c)
The voltage gradient of the digital signal converted in step (a) is positive; And
Wherein the voltage level of the digital signal converted in the step (a) is equal to or greater than a preset constant value.
KR1020150136044A 2015-09-25 2015-09-25 Power combination device of multiple small power sources and generation method of control signal therefor KR101746949B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100956105B1 (en) * 2009-09-30 2010-05-07 대동산전주식회사 The charge system using the multi-photovoltaic power supply plate
WO2014097554A1 (en) * 2012-12-19 2014-06-26 Murano Minoru Power transmission system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100956105B1 (en) * 2009-09-30 2010-05-07 대동산전주식회사 The charge system using the multi-photovoltaic power supply plate
WO2014097554A1 (en) * 2012-12-19 2014-06-26 Murano Minoru Power transmission system

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