M316418 八、新型說明： 【新型所屬之技術領域】 一種定電流電源供應裝置，係透過光耦合隔離迴授電路，使輸出 電流即使在負載極小甚至短路時亦能維持穩態者。 【先前技術】 不同性貝的負載有不同需求的電源供應方式，例如定電壓電源供 籲應I置，其輸出的電壓值恆為不變，輸出電流則隨負載變化而改變， 可以得到不同的輸出功率，即p(out)=v(c〇nstant)*I(variable)。 如第一圖所示之習知定電壓電源供應電路，其中v(out)為變壓器 (10)二次侧的輸出電壓，假設v(0ut)電壓產生變化而上升，將使分壓 電阻R1敗的为壓點電壓隨之提升，如此令流過三端並聯穩壓器 (Three-Terminal Shunt Regulat〇r) TL431 的電流增加，則 器（opto-coupie)(11)中的 LED 亮度隨之一 (PWM)端的電壓獨，使該脈寬調㈣（pwM)輸出的「功週期」值減 少’進而將輪出電壓V(out)降下到正常設定的輸出值；反之，如果 V(out)電壓產生變化而降低，將使脈寬調變器（pwM)的「工作週期」值 增加’則令輪出電壓v(〇lrt)上升至正常設定的輸出值。 第二圖所補為-種習知之定電流電源供應，其供應給負載 端⑽的輪出電流為蚊，電壓隨負载的變化而有所改變，即負載阻 抗增加則電壓隨之升高，其所雜的功率亦隨負載阻抗增加而提高； 5 M316418 如。亥圖所不之迴授控制電路中，當電流經負載(2〇)流過電阻此使 端的電壓降增加，如果大於三端並聯穩壓器⑽⑽―M316418 VIII. New Description: [New Technology Field] A constant current power supply device is an optically coupled isolation feedback circuit that allows the output current to maintain steady state even when the load is extremely small or even short-circuited. [Prior Art] Different types of load have different power supply modes, such as constant voltage power supply for I, the output voltage value is constant, and the output current changes with load, which can be different. Output power, ie p(out)=v(c〇nstant)*I(variable). As shown in the first figure, the conventional constant voltage power supply circuit, in which v(out) is the output voltage of the secondary side of the transformer (10), assuming that the v(0ut) voltage changes and rises, the voltage dividing resistor R1 will be defeated. The voltage at the voltage is increased accordingly, so that the current flowing through the three-terminal shunt regulator (Three-Terminal Shunt Regulat〇r) TL431 increases, and the brightness of the LED in the opto-coupie (11) The voltage at the (PWM) terminal is unique, which reduces the "power cycle" value of the pulse width modulation (4) (pwM) output and further reduces the wheeling voltage V(out) to the normally set output value; conversely, if the V(out) voltage Decreasing the change will increase the "life cycle" value of the pulse width modulator (pwM) to increase the turn-on voltage v(〇lrt) to the normally set output value. The second figure supplements a conventional constant current power supply. The output current supplied to the load terminal (10) is a mosquito, and the voltage changes with the load, that is, the voltage increases as the load impedance increases. The power used is also increased as the load impedance increases; 5 M316418. In the feedback control circuit of the Haitu, when the current flows through the load (2〇), the voltage drop of the terminal increases, if it is greater than the three-terminal shunt regulator (10) (10)
Regulator) Ί1431的參考電塵，使通過TL431的電流增力口，則與之連 接之光輕合器（opto-couple)⑼中的LE㈣亮度亦增加，使被感應之 光電晶體(22)的電流加大’如此脈寬調變器（pwM)輸出的「通」值減少， 而令輸出的功率降制正常設定的輸出值，使電流，蚊，·反之亦然， 纽經電阻此的電壓下降，則光電晶體(22)的電流減少，令脈寬調變 器_)輸㈣「工作週期」值增加，藉以提升輸出功率為正常設定的 輸出值。 惟’以上述不論是_三端並聯穩壓器㈣ 咖咖）職、或是〇p(運算放大器）、甚至其它參考性控制元件 2來產峨梅觸，若在貞__、，鍋出端短路 耗況下，即輪出電壓V(out)低於職的參考賴，則會產生如第 二圖所不低於2· 5辦電流上料鑛等現象。 【新型内容】 為改善上揭先前技術所產生的缺失 「定:流!_裝置」，使在編小或短路:二=: 到穩流狀怨，為本創作之主要目的； 剧達 特別是本創作之控制迴路中’不需要透過三端 (Three-Terminal Shunt Regulate^、如7 土 使用目的’一設計而利於=成前本述频電流的 6 M316418 為實現這個目的，本創作主要包括： 一電源輸人端及-電源輸出端，該電源輸出端用以連接預定的負 載； 、 一變壓器以-次_接電源輸入端、二次側減電源輪出端； 一連接於變壓器一次侧之脈寬調變器❼胃）； 一連接於脈寬調變器之光感應開關；及， 一連接於變壓器二次側之光耦合器； φ 其中， 該光搞合器並聯-控制電阻與電源輪出端（即負載端）的迴路相 連’在負载變化時，即使負載很小或短路的情況下，藉該控制電阻至 少會產生-個參考電壓，該參考電壓即等同於糾合器的端電壓；當 電流流過㈣電阻，電阻上的電壓上升錄經紐合器㈣流令其亮 度增加’藉光感應讓流經光感應開關的電流加大，如此脈寬調變器_) 輸出的「工作週期」值減少，而令輸出的功率降制正常設定的輸出 •值’以維持電流恆定的穩態。 至於本創作之詳_容及其他_之實施方式，脑合圖式說明 如后： 【實施方式】 士第四圖所不，本創作主要包括—電源輸入端⑽)及一電源輸出 鈿(31) ’ δ亥電源輸出端(31)用以連接預定的負載⑽;一變壓器⑶) 以-次_接電源輸人端⑽、二次側祕電源輸崎Μ);—連接 M316418 於賴器（33)-次侧之脈寬調變器（PWM)⑽；一連接於脈寬調變器 (34)之光感應開關（35)，如圖示之光電晶體；及，一連接於變壓器⑽ 二次側之光輕合器（36)，如圖示之光二極體；其中，該光輕合器（36) 並聯-控制電阻R(37)與電源輸出端(31)(即負載端）的迴路相連，在 連接之負載(32)產生變化時，特別是負載很小（例如⑽模組、電池 等）或短路的情況下’該控制電阻R⑽至少會產生—個迴授取樣之 參考电壓V(ref)，該參考電壓即等同於光麵合器（36)的端電壓 V(led);當電流流過控制電阻，電阻上的電壓上升使流經光麵合器⑽ 的電流令其亮度增加，藉域應讓流經域應關（35)的電流加大， 如此脈寬調變器(PWMX34)輸出的「工作週期」值就會減少，而令輸出 的功率降低到正常設定的輸出值，以維持電流I(〇ut)等於v(ied)/R 的怪定穩態。 过貝加例中，創作人考慮到光搞合器（36)的參考電壓值乂(〖Μ) T著其巾讀發光溫賴化而有所改變(請參考第五圖），對輸出電 :產生不穩定的影響。緣是，請參第六圖所示，特別在該控制電阻以37) 而串接顆一極體(38)作為溫度補償；亦即找一顆二極體(38)隨溫度 產生改變之電⑷變化量，要相近於光辆合器⑽因環境溫度所 產生的改變電壓柳⑹變化量，即，如此，該迴授 =樣的賴VCref)就可以不受光齡||(36)之元件環境溫度變化的 影響而得到補償，獲得_個穩定的電流輸出。 U所述’可以發縣鑛確已符合新型專利之要件，爰依法提 出專利申請。惟，以上前述僅為本創作之較佳實施方式，自不能以此 M316418 限定本創作之權利範圍。舉凡所屬技術領域中具有通常知識者妥依本 創作之精神所作之等效料讀化，皆仍缝於後附之巾料利範圍 内0 【圖式簡單說明】 第-圖為-種習知之定電壓電源供應電路狀細。 第二圖為一種習知之定電流電源供應電路狀態圖。 第三圖為習知定電流電職應電路因負她小_路情形下所產生輸 出電流不穩定的示意圖。 第四圖為本創作之詳細電路圖。 第五圖為本創個光終ϋ之LED隨溫度變化對輸出電流可能產 響之曲線圖。 ' 第六圖為本創作增加溫度補償後之變壓器二次侧電路狀態圖。 【主要元件符號說明】 電源輸入端（30) 電源輸出端（31) 負载(32) 變壓器（33) 脈九調變器（PWM) ( 34) 光感應開關（35) 光耦合器（36) 9 M316418 控制電阻(37) 二極體(38)Regulator) The reference dust of Ί1431 is such that the current through the TL431 increases the brightness of the LE (four) in the opto-couple (9) connected to it, causing the current of the induced photodiode (22). Increase the "pass" value of the output of such a pulse width modulator (pwM), and reduce the output power to the normally set output value, so that the current, the mosquito, and vice versa, the voltage of the new resistor decreases. Then, the current of the photoelectric crystal (22) is reduced, so that the pulse width modulator _) input (four) "work cycle" value is increased, thereby increasing the output power to the normally set output value. However, in the above, whether it is _ three-terminal shunt regulator (four) café, or 〇p (operational amplifier), and even other reference control components 2 to produce 峨 plum touch, if 贞 __,, pot out In the short-circuit condition of the terminal, that is, the voltage V(out) of the wheel is lower than the reference value of the job, the phenomenon that the current is not lower than the current in the second figure is generated. [New content] In order to improve the lack of the previous technology, the "definite: flow!_device" is made to be small or short-circuited: two =: to steady flow, the main purpose of this creation; In the control loop of this creation, there is no need to pass the three-terminal (Three-Terminal Shunt Regulate^, such as 7 soil use purpose) design to facilitate the conversion of the current frequency of 6 M316418 for this purpose, this creation mainly includes: a power input end and a power output end, the power output end is used to connect a predetermined load; a transformer is connected to the power input end of the secondary power supply, and the secondary side is reduced by the power supply wheel; a pulse width modulator ❼ stomach); a light sensor switch connected to the pulse width modulator; and, an optical coupler connected to the secondary side of the transformer; φ where the light combiner is connected in parallel - the control resistor and the power source The circuit of the wheel terminal (ie the load terminal) is connected. When the load changes, even if the load is small or short-circuited, at least one reference voltage is generated by the control resistor, and the reference voltage is equivalent to the terminal voltage of the rectifier. ;when The current flows through (4) the resistance, and the voltage rise on the resistor is recorded by the button (4) to increase its brightness. 'By the light sensor, the current flowing through the light sensor switch is increased, so the pulse width modulator _) The value is reduced, and the output power is reduced to a normally set output value of 'to maintain a steady state of steady current. As for the details of this creation and other implementation methods, the brain diagram is as follows: [Implementation] In the fourth picture, the creation mainly includes - power input (10) and a power output (31). ) ' δ Hai power output (31) is used to connect the predetermined load (10); a transformer (3)) is connected to the power supply terminal (10), the secondary side power supply is rugged); - the M316418 is connected to the device ( 33) - the pulse width modulator (PWM) of the secondary side (10); a light sensing switch (35) connected to the pulse width modulator (34), such as the illustrated photoelectric crystal; and, one connected to the transformer (10) a secondary light combiner (36), such as the illustrated photodiode; wherein the optical combiner (36) is connected in parallel - the control resistor R (37) and the power output (31) (ie, the load end) The loop is connected. When the load (32) of the connection changes, especially when the load is small (for example, (10) module, battery, etc.) or short circuit, the control resistor R(10) generates at least a reference voltage V for feedback sampling. (ref), the reference voltage is equivalent to the terminal voltage V(led) of the optical combiner (36); when the current flows through the control resistor, the voltage across the resistor The current flowing through the optical coupler (10) increases its brightness, and the current should be increased by the current flowing through the domain (35), so that the "work cycle" value of the pulse width modulator (PWMX34) output is It will decrease, and the output power will be reduced to the normally set output value to maintain the current I (〇ut) equal to the strange steady state of v(ied)/R. In the case of Bega, the creator considered that the reference voltage value of the light fitting device (36) 乂 (〖Μ) T changed with the temperature of the towel reading light (refer to the fifth figure), the output power : Produces an unstable effect. The edge is, as shown in the sixth figure, especially in the control resistor, 37) is connected in series with a pole body (38) as temperature compensation; that is, to find a diode (38) with temperature change (4) The amount of change should be similar to the change of the voltage (6) caused by the ambient temperature of the optical clutch (10), that is, the feedback = the VCref of the sample can be free of the components of the light age || (36) The effect of the change in ambient temperature is compensated to obtain a stable current output. U said that the county can indeed meet the requirements of the new patent, and the patent application is filed according to law. However, the foregoing is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited by this M316418. The equivalent readings made by the general knowledge in the technical field of the art are still within the scope of the attached towel. [Simplified illustration] The first picture is a kind of knowledge. The constant voltage power supply circuit is fine. The second figure is a state diagram of a conventional constant current power supply circuit. The third figure is a schematic diagram of the instability of the output current generated by the conventional constant current electric field circuit due to the negative her _ road. The fourth picture is a detailed circuit diagram of the creation. The fifth figure is a graph showing the possible output of the LED with temperature change with temperature. The sixth figure is the state diagram of the secondary side circuit of the transformer after adding temperature compensation for the creation. [Main component symbol description] Power input terminal (30) Power supply output terminal (31) Load (32) Transformer (33) Pulse nine-modulation device (PWM) ( 34) Light sensor switch (35) Photocoupler (36) 9 M316418 Control Resistor (37) Diode (38)