1356179 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種電子負載裝置，尤其關於/種用於 電源測試之電子負載裝置。 【先前技術】 對於電源產品而言’於出廢前進行檢驗是一道必不可 夕之工序。此外’部份電子產品中在出廢時都已經裝配了 電源因此，在工廠生產時，檢測電源亦有相當必要。常 見地，人們使用模擬之負載裝置以測試電源之電氣性能， 該等負載裝置可以模擬出電源於工作狀態時所帶載荷。將 存測電源加載於該等負載裝置上時，可以測出電源於模擬 工作狀態下之特性。 。模擬之負載裝置通常有兩種類型：第一種是由電阻 15、，電容器、電感器等無源器件構成，此種負載之參數大 :調節起來非常不方便，而且其參數穩定性不高，受環境 :濕度影響較大，因而不能有效地檢驗出待測電源之性 =種疋由早片機及電阻器等構成之電子負載，此種 穩定性第一種負載之參數大小調節不方便、 電子但是使用單片機作為構成元件使得該 貝戟之功耗增大，且成本大幅提高。 【發明内容】 1356179 有雲於此彳必要提供一種具有較低功耗、低成本的 電子負載裝置。 日-種電子負載裝£包括電源供給電路、電流控制電路 及里測"面電路。該電源供給電路用於向該電流控制電路 提供工作電Μ。該電源供給電路包括相連接之電屢調節單 元及比較放大單元’該電㈣節單元之電㈣出端連接到 該比較放大單元之同相輸入端’該比較放大單元之反相輸 入端連接到該電流控制電路之輸出端。該電流控制電路及 該量測介面電路串接於待測電源上。該電流控制電路用於 控制流入該量測介面電路之電流大小。該量測介面電路用 於向測量儀器提供接入介面。 旦上述電子貞餘置通過在㈣流㈣電料調節流經 έ里七丨面電路的電流，以及調整該量測介面電路，可以1356179 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to an electronic load device, and more particularly to an electronic load device for power supply testing. [Prior Art] For power supply products, it is an inevitable process to conduct inspection before it is disposed of. In addition, some of the electronic products have been equipped with power at the time of disposal. Therefore, when the factory is manufactured, it is necessary to detect the power supply. Often, people use simulated load devices to test the electrical performance of the power supply. These load devices can simulate the load that the power supply carries when it is in operation. When the stored test power is loaded on the load devices, the characteristics of the power supply under simulated operation can be measured. . There are usually two types of analog load devices: the first one is composed of passive components such as resistors 15, capacitors, inductors, etc. The parameters of such loads are large: it is very inconvenient to adjust, and its parameter stability is not high. Affected by the environment: humidity has a large impact, so it can not effectively check the nature of the power source to be tested = the electronic load consisting of the early film machine and the resistor, etc. This kind of stability is inconvenient to adjust the parameter size of the first load. However, the use of a single-chip microcomputer as a constituent element increases the power consumption of the beta, and the cost is greatly increased. SUMMARY OF THE INVENTION 1356179 There is a need to provide an electronic load device with low power consumption and low cost. The Japanese-style electronic load includes a power supply circuit, a current control circuit, and a "measurement" circuit. The power supply circuit is operative to provide operating current to the current control circuit. The power supply circuit includes a connected electrical repeating unit and a comparative amplifying unit. The electrical (four) output of the electrical (four) node is connected to the non-inverting input of the comparative amplifying unit. The inverting input of the comparing amplifying unit is connected to the The output of the current control circuit. The current control circuit and the measurement interface circuit are serially connected to the power source to be tested. The current control circuit is operative to control the amount of current flowing into the measurement interface circuit. The measurement interface circuit is used to provide an access interface to the measuring instrument. Once the above-mentioned electronic enthalpy remains, the current flowing through the circuit of the seven-story circuit in the (four) flow (four) is adjusted, and the measurement interface circuit is adjusted.
調即負載的大小1而可以在不使用單片機的情況下達到 :待測電源進行量測的效果，降低了電子負載裝置的 耗、成本。 【實施方式】 如f 1所不，其為較佳實施方式之電子負載裝置功能 :不思圖。該電子負載裝置10包括電源供給電路12、f 提路14及量測介面電路16。電源供給電路12用於 楗供-個穩定之工作電壓，以供 後續雷玖丁从 貝戟裝110之其他 電路工作之用。電流控制電路14與量測介面電路 1356179 串聯後被接入到待測電源20之正負極之間，成為待測電源 20之負載；同時電流控制電路14之輸出電壓還被回饋到電 源供給電路12。當電流控制電路14被接入待測電源20時， 其可以控制輸出到量測介面電路16的電流之大小。量測介 面電路16用於提供量測介面，以供測量儀器30接入。 如圖2所示，其為較佳實施方式之電子負載裝置10之 電路結構圖。電源供給電路12主要包括直流電源輸入端 122、穩壓單元124、電壓調節單元126、比較放大單元128 •及開關單元130。 直流電源輸入端122用於與一個外界之直流電源相連 接，接收該直流電源輸入之直流電壓。 穩壓單元124與直流電源輸入端122相連，從而對該 直流電源輸入端122提供之直流電壓進行穩壓操作，消除 該直流電壓中可能存在之紋波電壓。較佳地，該穩壓單元 124為一個三端穩壓集成塊，如LM7812穩壓器，該LM7812 |穩壓器可以輸出一個穩定的正極性12V電壓。 電壓調節單元126用於接收該穩壓單元124之輸出電 壓，在此基礎上經由使用者調節並輸出一個經調節之電 壓。如圖2所示，該電壓調節單元126包括兩個相並聯之 支路，其中一個支路由電阻器Rl、R12串聯而成，另一支 路由電阻器R3、變阻器W1串聯而成，兩支路之一端經由 一個限流電阻R2連接於穩壓單元124之輸出端，另一端接 地。該電壓調節單元126亦包括一個可編程精密參考Q6。 該可編程精密參考Q6亦與該二個支路相並聯，其參考端連 W6179 .接於電阻R1和電阻Rl2 R!，之大小，即可調節該猎由調節電阻 壓。變阻器W1之阻佶，程精达、參考Q6之輸出電 值可調，稭由調節其阻值，使得竽雷# 調節單元126可以輸出—個 便件该電屋 元128。 個了被調即之㈣到比較放大單 較佳地，該可編程精密必老 密來老^ ,枉積在參考Q6為TL43!三端可編程精 ， ㈣有—個基準電麼，其輸出㈣由以下公 . u0^vrJ1+IL) :之二出雪严^，其為該可編程精密參考Q6兩 之輸出㈣’仏奶分別為電阻Ri、⑽之阻值大小， 二SI編程精密參考之内部參考電厂堅。較佳地，該内 邛參考電屋K為2.5V。 元二m之同相輸入端（+)接入電屋調節單 兀126之輸出電壓及 之耠…以 ㈠與電流控制電路14 =^電性相連。較佳地，該比較放大單元ΐ2δ為一種 :放=U2。當電壓調節單元126中之變阻謂被設 :’電壓調節單元126即輸出一個穩 :出二較放大單元128之同相輸入端⑴被作為參:電 ’ ^控山制電路14之輸出端連接到比較放大單元128之 關單J1端（）’比較放大單元128之輸出電壓被作為開 關早疋130之開關控制電壓。 ^關單元130可以為一個三極管Q1，其基極藉由一個 連接於比較放大單元128之輸出端，集電極通過電 C $ 10 13.56179 阻R6連接於穩壓單元124之輸出端，發射極通過電阻R7 連接到電流控制電路14之控制輸入端。當該開關單元130 打開時，發射極發出控制電壓到電流控制電路14。 電流控制電路14為一系列功率電晶體相並聯而成，該 功率電晶體還可以是功率MOSFET (金屬氧化物半導體場 效應管）或 IGBT ( Insulated Gate Bipolar Transistor，閘極 絕緣雙載子型電晶體），以下以IGBT為例作一說明。 以相互並聯之各IGBT支路中的一支為例，其包括一個 ® IGBT Q2、一個與IGBT Q2之閘極相連的電阻R8、以及一 個與IGBT Q2的汲極相連的二極體D1。IGBT Q2之閘極經 由電阻R7、R8與開關單元130之輸出端，即三極管Q1之 發射極相連。二極體D1之正極與待測電源20之正極相連， 負極與IGBT Q2的汲極相連。IGBT Q2之源極與量測介面 電路16相連接。藉由更換不同之IGBT，可以獲得不同之 輸出電流到量測介面電路16。由於IGBT Q2具有較高的耐 •壓特性，可以耐受幾百甚至上千伏之電壓，且在其導通區 内的線性度極高，使得該電子負載裝置10可以在較寬之待 測電壓範圍内工作，並具有較佳之線性度。 量測介面電路16之一端連接於電流控制電路14之輸 出端，另一端連接於待測電源之負極。較佳地，該量測介 面電路16為一系列電阻R15、R16、R17、R18......並聯而 成。該等並聯電阻可以對電流控制電路14之輸出電流進行 分流，從而當測量儀器30接入到量測介面電路16兩端時， 可以測量到量測介面電路16兩端電壓之大小。被接入待測 11 1356179 電源20之負載包括有電流控制電路i4及量測介面電路 16，而由於電流控制電路14使用的是具有較好線性度之 IGBT目％可以方便地計算出待測電源之電流特性、電壓 特徵及功率特性等。 上迷電子負載裝置 k任電流控制屯吟i 4f γ接入 不同之IGBT、在里測介面電路16中接入不同之並聯電阻， :以調即該電子負載之大小；而通過調節電壓調節單元⑶The size of the load is 1 and can be achieved without using a single-chip microcomputer: the effect of measuring the power supply to be tested reduces the consumption and cost of the electronic load device. [Embodiment] As f1, it is a function of the electronic load device of the preferred embodiment: it is not considered. The electronic load device 10 includes a power supply circuit 12, an f-route 14 and a measurement interface circuit 16. The power supply circuit 12 is operative to provide a stable operating voltage for subsequent operation of the Thunder from the other circuits of the beryllium 110. The current control circuit 14 is connected in series with the measurement interface circuit 1356179 and connected between the positive and negative terminals of the power supply 20 to be tested, and becomes the load of the power supply 20 to be tested; meanwhile, the output voltage of the current control circuit 14 is also fed back to the power supply circuit 12 . When the current control circuit 14 is connected to the power source 20 to be tested, it can control the magnitude of the current output to the measurement interface circuit 16. The measurement interface circuit 16 is used to provide a measurement interface for access by the measurement instrument 30. As shown in Fig. 2, it is a circuit configuration diagram of the electronic load device 10 of the preferred embodiment. The power supply circuit 12 mainly includes a DC power input terminal 122, a voltage stabilization unit 124, a voltage adjustment unit 126, a comparison amplification unit 128, and a switch unit 130. The DC power input terminal 122 is configured to be connected to an external DC power source to receive the DC voltage input from the DC power source. The voltage stabilizing unit 124 is connected to the DC power input terminal 122 to regulate the DC voltage supplied from the DC power input terminal 122 to eliminate the ripple voltage that may exist in the DC voltage. Preferably, the voltage stabilizing unit 124 is a three-terminal voltage regulator integrated block, such as the LM7812 voltage regulator, and the LM7812 | voltage regulator can output a stable positive polarity 12V voltage. The voltage regulating unit 126 is configured to receive the output voltage of the voltage stabilizing unit 124, and adjust and output a regulated voltage via the user. As shown in FIG. 2, the voltage regulating unit 126 includes two parallel branches, one of which is formed by connecting resistors R1 and R12 in series, and another routing resistor R3 and varistor W1 are connected in series, and two branches are formed. One end is connected to the output terminal of the voltage stabilizing unit 124 via a current limiting resistor R2, and the other end is grounded. The voltage conditioning unit 126 also includes a programmable precision reference Q6. The programmable precision reference Q6 is also connected in parallel with the two branches, and the reference terminal is connected to W6179. The size of the resistor R1 and the resistor Rl2 R! can be adjusted to adjust the voltage of the hunting resistor. The resistance of the varistor W1, the output voltage of Cheng Jingda and the reference Q6 are adjustable, and the straw is adjusted by the resistance value, so that the 竽雷# adjustment unit 126 can output a piece of the electric house 128. It is better to adjust (4) to compare the amplification. Preferably, the programmable precision must be old to the old ^, the hoarding in the reference Q6 is TL43! Three-end programmable fine, (4) has a reference power, its output (4) From the following public. u0^vrJ1+IL): The second is snowy ^, which is the output of the programmable precision reference Q6 (four) '仏 milk is the resistance Ri, (10) resistance value, two SI programming precision reference The internal reference power plant is strong. Preferably, the inner reference electric house K is 2.5V. The non-inverting input terminal (+) of Yuan 2 m is connected to the output voltage of the electric house adjustment unit 兀 126 and is connected to the current control circuit 14 = ^. Preferably, the comparison amplification unit ΐ2δ is one type: release=U2. When the variable resistance in the voltage adjusting unit 126 is set: 'the voltage adjusting unit 126 outputs a stable: the non-inverting unit 128 has the non-inverting input terminal (1) connected as the output of the electric control circuit 14 The output voltage of the comparison amplification unit 128 to the gate J1 end () of the comparison amplification unit 128 is used as the switch control voltage of the switch early 130. The off unit 130 can be a transistor Q1 whose base is connected to the output terminal of the comparison amplifying unit 128. The collector is connected to the output terminal of the voltage stabilizing unit 124 through the electric C C 10 13.56179 resistor R6, and the emitter passes through the resistor. R7 is coupled to the control input of current control circuit 14. When the switching unit 130 is turned on, the emitter emits a control voltage to the current control circuit 14. The current control circuit 14 is formed by connecting a series of power transistors in parallel. The power transistor can also be a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). ), the following is an example of IGBT. Taking one of the IGBT branches connected in parallel with each other as an example, it includes a ® IGBT Q2, a resistor R8 connected to the gate of the IGBT Q2, and a diode D1 connected to the drain of the IGBT Q2. The gate of the IGBT Q2 is connected to the output terminal of the switching unit 130 via the resistors R7, R8, that is, the emitter of the transistor Q1. The anode of the diode D1 is connected to the anode of the power source 20 to be tested, and the cathode is connected to the anode of the IGBT Q2. The source of the IGBT Q2 is connected to the measurement interface circuit 16. Different output currents can be obtained to the measurement interface circuit 16 by replacing different IGBTs. Since IGBT Q2 has high withstand voltage characteristics, it can withstand hundreds or even thousands of volts, and the linearity in its conduction region is extremely high, so that the electronic load device 10 can be used for a wide voltage to be measured. Works within range and has better linearity. One end of the measurement interface circuit 16 is connected to the output end of the current control circuit 14, and the other end is connected to the negative terminal of the power supply to be tested. Preferably, the measurement interface circuit 16 is formed by a series of resistors R15, R16, R17, R18, ... in parallel. The parallel resistors can shunt the output current of the current control circuit 14, such that when the measuring instrument 30 is connected across the measurement interface circuit 16, the voltage across the measurement interface circuit 16 can be measured. The load that is connected to the 11 1356179 power supply 20 to be tested includes a current control circuit i4 and a measurement interface circuit 16, and since the current control circuit 14 uses a IGBT with a good linearity, the power to be tested can be conveniently calculated. Current characteristics, voltage characteristics, and power characteristics. The electronic load device k is used to control the current 屯吟i 4f γ to access different IGBTs, and to connect different parallel resistors in the internal measurement interface circuit 16 : to adjust the size of the electronic load; and to adjust the voltage adjustment unit (3)
=變Ph wi ’還可以控制開關單元i3g之開啟與關斷； 因而可以在不使用單片機的情沉下達到對待測電源進行量 Z之效果’降低了電子負載裝置1()之功耗、成本。此外， 作時線性度較高，對於量測之後續處理而言非 ^方便；上述電子負載裝置1G還十分方便於進行功能擴 將該電子貞餘置作為—個魏模組 盆 他功能模线行整合，而實現更為全㈣功^ …、 綜上所述，本發明符合發明專利要 =技:之者僅為本發明之較佳實施例，= 或變化m含心讀神麟之等效修部 下之申睛專利範圍内。 12 i S ) 【圖式簡單說明】 二）:較佳實&方式之電子負餘置功能結構示意圖。 圖2為較佳實施方式之電子負載裝置之電路結構圖。 【主要元件符號說明】 1 〇電源供給電路 14量測介面電路 20測量儀器 122穩壓單元 126比較放大單元 130 12 16 30 124 128 電子負裁裝置 電流控制電路 Φ待測電源 •直流電源輸入端 電壓調節單元 開關單元= Change Ph wi ' can also control the opening and closing of the switching unit i3g; thus, the effect of the quantity Z to be measured can be achieved without using the single-chip microcomputer. The power consumption and cost of the electronic load device 1 are reduced. . In addition, the linearity of the operation is relatively high, which is not convenient for the subsequent processing of the measurement; the above-mentioned electronic load device 1G is also very convenient for function expansion, and the electronic enthalpy is used as a function module of the Wei module. Integration, and implementation of more complete (four) work ^ ... In summary, the present invention is in line with the invention patent = technology: only the preferred embodiment of the present invention, = or change m with the heart reading Shen Lin, etc. Within the scope of the patent application under the Ministry of Health. 12 i S ) [Simple description of the diagram] 2): Schematic diagram of the electronic negative residual function structure of the preferred real & mode. 2 is a circuit configuration diagram of an electronic load device of a preferred embodiment. [Main component symbol description] 1 〇 power supply circuit 14 measurement interface circuit 20 measuring instrument 122 voltage regulator unit 126 comparison amplification unit 130 12 16 30 124 128 electronic negative cutting device current control circuit Φ power supply to be tested • DC power input terminal voltage Adjustment unit switch unit