TWM513513U - Inverting apparatus and AC voltage sampling circuit thereof - Google Patents

Inverting apparatus and AC voltage sampling circuit thereof Download PDF

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Publication number
TWM513513U
TWM513513U TW104202504U TW104202504U TWM513513U TW M513513 U TWM513513 U TW M513513U TW 104202504 U TW104202504 U TW 104202504U TW 104202504 U TW104202504 U TW 104202504U TW M513513 U TWM513513 U TW M513513U
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Taiwan
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voltage
resistor
coupled
operational amplifier
input terminal
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TW104202504U
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Chinese (zh)
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Han-Wei Chen
Chun-Hao Yu
Chia-Hua Liu
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Fsp Technology Inc
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Publication of TWM513513U publication Critical patent/TWM513513U/en

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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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

An inverting apparatus and an AC voltage sampling circuit thereof are provided. A voltage of a positive input terminal of an operational amplifier in the AC voltage sampling circuit is raised up by a reference voltage generating unit, so as to make the AC voltage sampling circuit output a sampling voltage greater than zero.

Description

逆變裝置及其交流電壓取樣電路Inverter and its AC voltage sampling circuit

本創作是有關於一種取樣電路，且特別是有關於一種逆變裝置及其交流電壓取樣電路。The present invention relates to a sampling circuit, and more particularly to an inverter device and an AC voltage sampling circuit thereof.

在現有技術中，一般光伏並網系統的逆變裝置會設置取樣電路以檢測市電的電壓及電流，藉以根據所取樣到的電壓來判斷市電是否發生過電壓、欠電壓或調整逆變裝置的轉換動作。其中市電電壓通常是浮動且有正、負半週的電壓變化情形，然逆變裝置中的微處理器僅能接收正值的電壓，而無法讀取分析負值的電壓，如此將造成逆變裝置的控制出現問題，而無法使逆變裝置達到理想的轉換效率。In the prior art, the inverter device of the general photovoltaic grid-connected system sets a sampling circuit to detect the voltage and current of the mains, thereby determining whether the mains has an overvoltage, an undervoltage or adjusting the conversion of the inverter according to the sampled voltage. action. The mains voltage is usually floating and has positive and negative half-cycle voltage changes. However, the microprocessor in the inverter can only receive a positive voltage, but cannot read the negative voltage, which will cause the inverter. There is a problem with the control of the device, and the inverter cannot achieve the desired conversion efficiency.

本創作提供一種逆變裝置及其交流電壓取樣電路，可有效解決微處理器接收到負值電壓的問題。The present invention provides an inverter device and an AC voltage sampling circuit thereof, which can effectively solve the problem that the microprocessor receives a negative voltage.

本創作的交流電壓取樣電路，適於取樣一逆變裝置輸出 的交流電壓，包括運算放大器、第一電阻、第二電阻以及參考電壓產生單元。其中運算放大器具有正輸入端、負輸入端與輸出端，正輸入端與負輸入端接收交流電壓，而輸出端耦接微處理器的輸入端。第一電阻耦接於運算放大器的負輸入端與輸出端之間；第二電阻之一端耦接運算放大器的正輸入端。參考電壓產生單元之輸出端耦接第二電阻的另一端，輸出電壓值大於零的參考電壓。The AC voltage sampling circuit of the present invention is suitable for sampling an inverter output The AC voltage includes an operational amplifier, a first resistor, a second resistor, and a reference voltage generating unit. The operational amplifier has a positive input terminal, a negative input terminal and an output terminal. The positive input terminal and the negative input terminal receive an AC voltage, and the output terminal is coupled to the input end of the microprocessor. The first resistor is coupled between the negative input terminal and the output terminal of the operational amplifier; one end of the second resistor is coupled to the positive input terminal of the operational amplifier. The output end of the reference voltage generating unit is coupled to the other end of the second resistor, and the output voltage value is greater than zero.

在本創作的一實施例中，上述的交流電壓取樣電路係輸出電壓值大於零或等於零的取樣電壓。In an embodiment of the present creation, the AC voltage sampling circuit outputs a sampling voltage having a voltage value greater than zero or equal to zero.

在本創作的一實施例中，上述的交流電壓取樣電路，更包括第三電阻以及第四電阻。其中第三電阻之一端耦接運算放大器的正輸入端。第四電阻之一端耦接運算放大器的負輸入端，第三電阻與第四電阻的另一端接收交流電壓。In an embodiment of the present invention, the AC voltage sampling circuit further includes a third resistor and a fourth resistor. One of the third resistors is coupled to the positive input terminal of the operational amplifier. One end of the fourth resistor is coupled to the negative input terminal of the operational amplifier, and the other end of the third resistor and the fourth resistor receives the AC voltage.

在本創作的一實施例中，上述的交流電壓取樣電路更包括第五電阻，其耦接於運算放大器的輸出端與第二電阻的另一端。In an embodiment of the present invention, the AC voltage sampling circuit further includes a fifth resistor coupled to the output end of the operational amplifier and the other end of the second resistor.

在本創作的一實施例中，上述的參考電壓產生單元包括第一電容以及第二電容。第一電容與第二電容耦接於操作電壓與接地之間，第一電容與第二電容的共同接點耦接參考電壓產生單元的輸出端。In an embodiment of the present invention, the reference voltage generating unit includes a first capacitor and a second capacitor. The first capacitor and the second capacitor are coupled between the operating voltage and the ground, and the common junction of the first capacitor and the second capacitor is coupled to the output of the reference voltage generating unit.

在本創作的一實施例中，上述的參考電壓產生單元更包括第一分壓電阻以及第二分壓電阻。第一分壓電阻與第二分壓電阻耦接於操作電壓與接地之間，第一分壓電阻與第二分壓電阻的共同接點耦接參考電壓產生單元的輸出端。In an embodiment of the present invention, the reference voltage generating unit further includes a first voltage dividing resistor and a second voltage dividing resistor. The first voltage dividing resistor and the second voltage dividing resistor are coupled between the operating voltage and the ground, and the common junction of the first voltage dividing resistor and the second voltage dividing resistor is coupled to the output end of the reference voltage generating unit.

本創作的逆變裝置，包括逆變電路、交流電壓取樣電路以及控制單元。逆變電路接收直流電壓，並將直流電壓轉換為交流電壓。交流電壓取樣電路包括運算放大器、第一電阻、第二電阻以及參考電壓產生單元。其中運算放大器具有正輸入端、負輸入端與輸出端，正輸入端與負輸入端接收交流電壓，而輸出端耦接微處理器的輸入端。第一電阻耦接於運算放大器的負輸入端與輸出端之間。第二電阻之一端耦接運算放大器的正輸入端。參考電壓產生單元之輸出端耦接第二電阻的另一端，輸出電壓值大於零的參考電壓。控制單元耦接交流電壓取樣電路與逆變電路，依據運算放大器輸出的取樣電壓控制逆變電路將直流電壓轉換為交流電壓。The inverter device of the present invention includes an inverter circuit, an AC voltage sampling circuit and a control unit. The inverter circuit receives the DC voltage and converts the DC voltage into an AC voltage. The AC voltage sampling circuit includes an operational amplifier, a first resistor, a second resistor, and a reference voltage generating unit. The operational amplifier has a positive input terminal, a negative input terminal and an output terminal. The positive input terminal and the negative input terminal receive an AC voltage, and the output terminal is coupled to the input end of the microprocessor. The first resistor is coupled between the negative input terminal and the output terminal of the operational amplifier. One end of the second resistor is coupled to the positive input terminal of the operational amplifier. The output end of the reference voltage generating unit is coupled to the other end of the second resistor, and the output voltage value is greater than zero. The control unit is coupled to the AC voltage sampling circuit and the inverter circuit, and controls the inverter circuit to convert the DC voltage into an AC voltage according to the sampling voltage outputted by the operational amplifier.

在本創作的一實施例中，上述的控制單元包括驅動電路，其耦接逆變電路，控制逆變電路中開關的開啟與關閉，以將直流電壓轉換為交流電壓。In an embodiment of the present invention, the control unit includes a driving circuit coupled to the inverter circuit to control opening and closing of the switch in the inverter circuit to convert the DC voltage into an AC voltage.

在本創作的一實施例中，上述的交流電壓取樣電路係輸出電壓值大於零或等於零的取樣電壓。In an embodiment of the present creation, the AC voltage sampling circuit outputs a sampling voltage having a voltage value greater than zero or equal to zero.

在本創作的一實施例中，上述的交流電壓取樣電路更包括第三電阻、第四電阻以及第五電阻。其中第三電阻之一端耦接運算放大器的正輸入端。第四電阻之一端耦接運算放大器的負輸入端，第三電阻與第四電阻的另一端接收交流電壓。第五電阻耦接於運算放大器的輸出端與第二電阻的另一端。In an embodiment of the present invention, the AC voltage sampling circuit further includes a third resistor, a fourth resistor, and a fifth resistor. One of the third resistors is coupled to the positive input terminal of the operational amplifier. One end of the fourth resistor is coupled to the negative input terminal of the operational amplifier, and the other end of the third resistor and the fourth resistor receives the AC voltage. The fifth resistor is coupled to the output end of the operational amplifier and the other end of the second resistor.

在本創作的一實施例中，上述的參考電壓產生單元包括 第一電容以及第二電容。第一電容與第二電容耦接於操作電壓與接地之間，第一電容與第二電容的共同接點耦接參考電壓產生單元的輸出端。In an embodiment of the present creation, the reference voltage generating unit includes The first capacitor and the second capacitor. The first capacitor and the second capacitor are coupled between the operating voltage and the ground, and the common junction of the first capacitor and the second capacitor is coupled to the output of the reference voltage generating unit.

基於上述，本創作的實施例藉由參考電壓產生單元提高交流電壓取樣電路中運算放大器的正輸入端的電壓，以使交流電壓取樣電路輸出大於零的取樣電壓，避免微處理器接收到負值電壓而無法讀取分析。Based on the above, the embodiment of the present invention increases the voltage of the positive input terminal of the operational amplifier in the AC voltage sampling circuit by the reference voltage generating unit, so that the AC voltage sampling circuit outputs a sampling voltage greater than zero to prevent the microprocessor from receiving the negative voltage. Unable to read the analysis.

為讓本創作的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。In order to make the above features and advantages of the present invention more comprehensible, the following embodiments are described in detail with reference to the accompanying drawings.

102‧‧‧光伏組件102‧‧‧PV modules

104‧‧‧逆變電路104‧‧‧Inverter circuit

106‧‧‧交流電壓取樣電路106‧‧‧AC voltage sampling circuit

108‧‧‧控制單元108‧‧‧Control unit

110‧‧‧驅動電路110‧‧‧Drive circuit

112‧‧‧微處理器112‧‧‧Microprocessor

114‧‧‧參考電壓產生單元114‧‧‧reference voltage generating unit

A1‧‧‧運算放大器A1‧‧‧Operational Amplifier

VAC‧‧‧交流電壓VAC‧‧‧AC voltage

VDC‧‧‧直流電壓VDC‧‧‧ DC voltage

R1~R5‧‧‧電阻R1~R5‧‧‧ resistance

VC‧‧‧操作電壓VC‧‧‧ operating voltage

RD1、RD2‧‧‧分壓電阻RD1, RD2‧‧‧ voltage divider resistor

C1、C2‧‧‧電容C1, C2‧‧‧ capacitor

圖1繪示本創作一實施例之逆變裝置的示意圖。FIG. 1 is a schematic diagram of an inverter device according to an embodiment of the present invention.

圖2繪示本創作另一實施例之逆變裝置的示意圖。2 is a schematic diagram of an inverter device according to another embodiment of the present invention.

圖3繪示本創作另一實施例之逆變裝置的示意圖。3 is a schematic diagram of an inverter device according to another embodiment of the present invention.

圖1繪示本創作一實施例之逆變裝置的示意圖。請參照圖1，本實施例之逆變裝置使用在光伏系統中，逆變裝置包括逆變電路104、交流電壓取樣電路106以及控制單元108，逆變電路104的輸入端耦接一光伏組件102，控制單元108耦接逆變電路104與交流電壓取樣電路106，交流電壓取樣電路106耦接逆變電路 104的輸出端。進一步來說，控制單元108可包括驅動電路110與微處理器112，驅動電路110耦接逆變電路104，而微處理器112耦接交流電壓取樣電路106的輸出端。交流電壓取樣電路106可包括運算放大器A1、以及參考電壓產生單元114，其中運算放大器A1的正、負輸入端接收來自逆變電路104的交流電壓VAC，運算放大器A1的輸出端則耦接微處理器112的輸入端。另外，電阻R1耦接於運算放大器A1的負輸入端與輸出端之間，電阻R2耦接於運算放大器A1的正輸入端與參考電壓產生單元114之間。FIG. 1 is a schematic diagram of an inverter device according to an embodiment of the present invention. Referring to FIG. 1 , the inverter device of the embodiment is used in a photovoltaic system. The inverter device includes an inverter circuit 104 , an AC voltage sampling circuit 106 , and a control unit 108 . The input end of the inverter circuit 104 is coupled to a PV module 102 . The control unit 108 is coupled to the inverter circuit 104 and the AC voltage sampling circuit 106, and the AC voltage sampling circuit 106 is coupled to the inverter circuit. The output of 104. Further, the control unit 108 can include a driving circuit 110 and a microprocessor 112. The driving circuit 110 is coupled to the inverter circuit 104, and the microprocessor 112 is coupled to the output of the AC voltage sampling circuit 106. The AC voltage sampling circuit 106 can include an operational amplifier A1 and a reference voltage generating unit 114, wherein the positive and negative inputs of the operational amplifier A1 receive the AC voltage VAC from the inverter circuit 104, and the output of the operational amplifier A1 is coupled to the microprocessor. The input of the device 112. In addition, the resistor R1 is coupled between the negative input terminal and the output terminal of the operational amplifier A1, and the resistor R2 is coupled between the positive input terminal of the operational amplifier A1 and the reference voltage generating unit 114.

光伏組件102可用以將太陽光轉換為直流電壓VDC，而逆變電路104可接收來自光伏組件102的直流電壓VDC，並將其轉換為交流電壓VAC。進一步來說，逆變電路104中的開關(未繪示)可受控於控制單元108中的驅動電路110而開啟或關閉，進而將直流電壓VDC轉換為交流電壓VAC。The photovoltaic component 102 can be used to convert sunlight into a DC voltage VDC, and the inverter circuit 104 can receive the DC voltage VDC from the PV module 102 and convert it to an AC voltage VAC. Further, a switch (not shown) in the inverter circuit 104 can be turned on or off by being controlled by the driving circuit 110 in the control unit 108, thereby converting the DC voltage VDC into an AC voltage VAC.

交流電壓取樣電路106可對逆變電路104輸出的交流電壓VAC進行取樣，並將取樣到的電壓提供給微處理器112的輸入端。進一步來說，交流電壓取樣電路106中的運算放大器A1可依據其正、負輸入端所接收的交流電壓VAC輸出取樣電壓給微處理器112。其中運算放大器A1的正輸入端更接收來自參考電壓產生單元114所提供的參考電壓，由於參考電壓產生單元114所提供的參考電壓的電壓值大於零，因此可將運算放大器A1所輸出的取樣電壓的電壓值抬高，進而避免運算放大器A1所輸出的取樣電壓小於零，而使得微處理器112無法讀取分析取樣電壓，而影響到 逆變裝置的運作。The AC voltage sampling circuit 106 can sample the AC voltage VAC output by the inverter circuit 104 and provide the sampled voltage to the input of the microprocessor 112. Further, the operational amplifier A1 in the AC voltage sampling circuit 106 can output a sampling voltage to the microprocessor 112 according to the AC voltage VAC received at its positive and negative inputs. The positive input terminal of the operational amplifier A1 further receives the reference voltage supplied from the reference voltage generating unit 114. Since the voltage value of the reference voltage provided by the reference voltage generating unit 114 is greater than zero, the sampling voltage output by the operational amplifier A1 can be used. The voltage value is raised, thereby preventing the sampling voltage outputted by the operational amplifier A1 from being less than zero, so that the microprocessor 112 cannot read the analysis sampling voltage, which affects The operation of the inverter.

圖2繪示本創作一實施例之逆變裝置的示意圖。請參照圖2，進一步來說，上述交流電壓取樣電路106的實施方式並不以圖1的實施例為限，例如在本實施例中交流電壓取樣電路106更包括電阻R3、電阻R4、電阻R5，其中電阻R3與電阻R4的第一端分別耦接運算放大器A1的正入端與負輸入端，電阻R3與電阻R4的第二端則用以接收交流電壓VAC，另外電阻R5則耦接於運算放大器A1的輸出端與電阻R2的第二端。此外，在本實施例中，參考電壓產生單元114可包括電容C1與電容C2，電容C1與電容C2耦接於操作電壓VC與接地之間，且電容C1與電容C2的共同接點耦接參考電壓產生單元114的輸出端，操作電壓VC為正電壓(例如：+3.3V)。藉由電容C1與電容C2對操作電壓VC進行分壓，可於電容C1與電容C2的共同接點產生電壓值大於零的參考電壓(例如：+1.65V)，進而將運算放大器A1所輸出的取樣電壓的電壓值抬高，避免運算放大器A1所輸出的取樣電壓小於零。FIG. 2 is a schematic diagram of an inverter device according to an embodiment of the present invention. Referring to FIG. 2, further, the embodiment of the AC voltage sampling circuit 106 is not limited to the embodiment of FIG. 1. For example, in the embodiment, the AC voltage sampling circuit 106 further includes a resistor R3, a resistor R4, and a resistor R5. The first end of the resistor R3 and the resistor R4 are respectively coupled to the positive input terminal and the negative input terminal of the operational amplifier A1, and the second end of the resistor R3 and the resistor R4 is configured to receive the AC voltage VAC, and the resistor R5 is coupled to the resistor R5. The output of the operational amplifier A1 is connected to the second end of the resistor R2. In addition, in this embodiment, the reference voltage generating unit 114 may include a capacitor C1 and a capacitor C2. The capacitor C1 and the capacitor C2 are coupled between the operating voltage VC and the ground, and the common contact coupling of the capacitor C1 and the capacitor C2 is referenced. At the output of the voltage generating unit 114, the operating voltage VC is a positive voltage (for example, +3.3 V). By dividing the operating voltage VC by the capacitor C1 and the capacitor C2, a reference voltage having a voltage value greater than zero (for example, +1.65V) can be generated at the common contact of the capacitor C1 and the capacitor C2, and then the output of the operational amplifier A1 is output. The voltage value of the sampling voltage is raised to prevent the sampling voltage output from the operational amplifier A1 from being less than zero.

其中，參考電壓產生單元114的實施方式亦不限於圖2的實施例，如圖3所繪示的另一逆變裝置的示意圖所示，在圖3實施例中，參考電壓產生單元114更包括分壓電阻RD1、分壓電阻RD2。分壓電阻RD1與分壓電阻RD2耦接於操作電壓VC與接地之間，且分壓電阻RD1與分壓電阻RD2的共同接點耦接參考電壓產生單元114的輸出端。藉由分壓電阻RD1、分壓電阻RD2、電容C1以及電容C2亦可對操作電壓VC進行分壓，而使參考電 壓產生單元114產生電壓值大於零的參考電壓，進而將運算放大器A1所輸出的取樣電壓的電壓值抬高，避免運算放大器A1所輸出的取樣電壓小於零。The embodiment of the reference voltage generating unit 114 is not limited to the embodiment of FIG. 2 . As shown in the schematic diagram of another inverter device illustrated in FIG. 3 , in the embodiment of FIG. 3 , the reference voltage generating unit 114 further includes Voltage dividing resistor RD1, voltage dividing resistor RD2. The voltage dividing resistor RD1 and the voltage dividing resistor RD2 are coupled between the operating voltage VC and the ground, and the common contact of the voltage dividing resistor RD1 and the voltage dividing resistor RD2 is coupled to the output end of the reference voltage generating unit 114. The operating voltage VC can be divided by the voltage dividing resistor RD1, the voltage dividing resistor RD2, the capacitor C1, and the capacitor C2, so that the reference voltage is made. The voltage generating unit 114 generates a reference voltage whose voltage value is greater than zero, thereby raising the voltage value of the sampling voltage outputted by the operational amplifier A1 to prevent the sampling voltage output from the operational amplifier A1 from being less than zero.

綜上所述，本創作的實施例藉由參考電壓產生單元提高交流電壓取樣電路中運算放大器的正輸入端的電壓，以使交流電壓取樣電路輸出大於零的取樣電壓，如此便可避免微處理器接收到負值電壓而無法讀取分析，而影響到逆變裝置的運作。In summary, the embodiment of the present invention increases the voltage of the positive input terminal of the operational amplifier in the AC voltage sampling circuit by the reference voltage generating unit, so that the AC voltage sampling circuit outputs a sampling voltage greater than zero, thereby avoiding the microprocessor. The negative voltage is received and the analysis cannot be read, which affects the operation of the inverter.

102‧‧‧光伏組件102‧‧‧PV modules

104‧‧‧逆變電路104‧‧‧Inverter circuit

106‧‧‧交流電壓取樣電路106‧‧‧AC voltage sampling circuit

108‧‧‧控制單元108‧‧‧Control unit

110‧‧‧驅動電路110‧‧‧Drive circuit

112‧‧‧微處理器112‧‧‧Microprocessor

114‧‧‧參考電壓產生單元114‧‧‧reference voltage generating unit

A1‧‧‧運算放大器A1‧‧‧Operational Amplifier

VAC‧‧‧交流電壓VAC‧‧‧AC voltage

VDC‧‧‧直流電壓VDC‧‧‧ DC voltage

R1、R2‧‧‧電阻R1, R2‧‧‧ resistance

Claims (11)

一種交流電壓取樣電路，適於取樣一逆變裝置輸出的交流電壓，包括：一運算放大器，係具有一正輸入端、一負輸入端與一輸出端，其中該正輸入端與負輸入端係接收該交流電壓，而該輸出端耦接一微處理器的輸入端；一第一電阻，耦接於該運算放大器的負輸入端與輸出端之間；一第二電阻，其一端耦接該運算放大器的正輸入端；以及一參考電壓產生單元，其輸出端耦接該第二電阻的另一端，輸出一電壓值大於零的參考電壓。 An AC voltage sampling circuit is adapted to sample an AC voltage output by an inverter device, comprising: an operational amplifier having a positive input terminal, a negative input terminal and an output terminal, wherein the positive input terminal and the negative input terminal are Receiving the AC voltage, and the output end is coupled to the input end of the microprocessor; a first resistor coupled between the negative input end and the output end of the operational amplifier; and a second resistor coupled to the end a positive input terminal of the operational amplifier; and a reference voltage generating unit, the output end of which is coupled to the other end of the second resistor, and outputs a reference voltage whose voltage value is greater than zero. 如申請專利範圍第1項所述的交流電壓取樣電路，其中該交流電壓取樣電路係輸出一電壓值大於零或等於零的取樣電壓。 The AC voltage sampling circuit of claim 1, wherein the AC voltage sampling circuit outputs a sampling voltage having a voltage value greater than zero or equal to zero. 如申請專利範圍第1項所述的交流電壓取樣電路，更包括：一第三電阻，其一端耦接該運算放大器的正輸入端；以及一第四電阻，其一端耦接該運算放大器的負輸入端，該第三電阻與該第四電阻的另一端接收該交流電壓。 The AC voltage sampling circuit of claim 1, further comprising: a third resistor having one end coupled to the positive input terminal of the operational amplifier; and a fourth resistor coupled to the negative end of the operational amplifier At the input end, the third resistor and the other end of the fourth resistor receive the alternating voltage. 如申請專利範圍第3項所述的交流電壓取樣電路，更包括：一第五電阻，耦接於該運算放大器的輸出端與該第二電阻的另一端。 The AC voltage sampling circuit of claim 3, further comprising: a fifth resistor coupled to the output end of the operational amplifier and the other end of the second resistor. 如申請專利範圍第1項所述的交流電壓取樣電路，其中該參考電壓產生單元包括：一第一電容；以及 一第二電容，該第一電容與該第二電容耦接於一操作電壓與一接地之間，該第一電容與該第二電容的共同接點耦接該參考電壓產生單元的輸出端。 The AC voltage sampling circuit of claim 1, wherein the reference voltage generating unit comprises: a first capacitor; And a second capacitor, the first capacitor and the second capacitor are coupled between an operating voltage and a ground, and a common junction of the first capacitor and the second capacitor is coupled to an output of the reference voltage generating unit. 如申請專利範圍第5項所述的交流電壓取樣電路，其中該參考電壓產生單元更包括：一第一分壓電阻；以及一第二分壓電阻，該第一分壓電阻與該第二分壓電阻耦接於該操作電壓與該接地之間，該第一分壓電阻與該第二分壓電阻的共同接點耦接該參考電壓產生單元的輸出端。 The AC voltage sampling circuit of claim 5, wherein the reference voltage generating unit further comprises: a first voltage dividing resistor; and a second voltage dividing resistor, the first voltage dividing resistor and the second component The voltage resistor is coupled between the operating voltage and the ground. The common junction of the first voltage dividing resistor and the second voltage dividing resistor is coupled to the output of the reference voltage generating unit. 一種逆變裝置，包括：一逆變電路，接收一直流電壓，並將該直流電壓轉換為一交流電壓；一交流電壓取樣電路，包括：一運算放大器，具有一正輸入端、一負輸入端與一輸出端，其中該正輸入端與負輸入端係接收該交流電壓，而該輸出端耦接一微處理器的輸入端；一第一電阻，耦接於該運算放大器的負輸入端與輸出端之間；一第二電阻，其一端耦接該運算放大器的正輸入端；以及一參考電壓產生單元，其輸出端耦接該第二電阻的另一端，輸出一電壓值大於零的參考電壓；以及 一控制單元，耦接該交流電壓取樣電路與該逆變電路，依據該運算放大器輸出的取樣電壓控制該逆變電路將該直流電壓轉換為該交流電壓。 An inverter device comprising: an inverter circuit for receiving a DC voltage and converting the DC voltage into an AC voltage; an AC voltage sampling circuit comprising: an operational amplifier having a positive input terminal and a negative input terminal And an output terminal, wherein the positive input terminal and the negative input terminal receive the AC voltage, and the output terminal is coupled to an input end of a microprocessor; a first resistor coupled to the negative input terminal of the operational amplifier and a second resistor, one end of which is coupled to the positive input terminal of the operational amplifier; and a reference voltage generating unit, the output end of which is coupled to the other end of the second resistor, and outputs a reference with a voltage value greater than zero. Voltage; A control unit is coupled to the AC voltage sampling circuit and the inverter circuit, and controls the inverter circuit to convert the DC voltage into the AC voltage according to a sampling voltage output by the operational amplifier. 如申請專利範圍第7項所述的逆變裝置，其中該控制單元包括：一驅動電路，耦接該逆變電路，控制該逆變電路中開關的開啟與關閉，以將該直流電壓轉換為該交流電壓。 The inverter device of claim 7, wherein the control unit comprises: a driving circuit coupled to the inverter circuit to control opening and closing of the switch in the inverter circuit to convert the DC voltage into The AC voltage. 如申請專利範圍第7項所述的逆變裝置，其中該交流電壓取樣電路係輸出一電壓值大於零或等於零的取樣電壓。 The inverter device of claim 7, wherein the AC voltage sampling circuit outputs a sampling voltage having a voltage value greater than zero or equal to zero. 如申請專利範圍第7項所述的逆變裝置，其中該交流電壓取樣電路更包括：一第三電阻，其一端耦接該運算放大器的正輸入端；一第四電阻，其一端耦接該運算放大器的負輸入端，該第三電阻與該第四電阻的另一端接收該交流電壓；以及一第五電阻，耦接於該運算放大器的輸出端與該第二電阻的另一端。 The inverter device of claim 7, wherein the AC voltage sampling circuit further comprises: a third resistor having one end coupled to the positive input terminal of the operational amplifier; and a fourth resistor coupled to the first resistor a negative input terminal of the operational amplifier, the third resistor and the other end of the fourth resistor receive the alternating current voltage; and a fifth resistor coupled to the output end of the operational amplifier and the other end of the second resistor. 如申請專利範圍第7項所述的逆變裝置，其中該參考電壓產生單元包括：一第一電容；以及一第二電容，該第一電容與該第二電容耦接於一操作電壓與一接地之間，該第一電容與該第二電容的共同接點耦接該參考電壓產生單元的輸出端。 The inverter device of claim 7, wherein the reference voltage generating unit comprises: a first capacitor; and a second capacitor, the first capacitor and the second capacitor are coupled to an operating voltage and a A common junction of the first capacitor and the second capacitor is coupled to an output of the reference voltage generating unit.
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