KỸ THUẬT INVERTER – Phụ lục 4 : mạch cầu H khuếch đại công suất lớp D

NHỮNG CHI TIẾT KỸ THUẬT CỦA INVERTER LƯU ĐIỆN HÒA PHA

Qua 3 kỳ của chùm bài KỸ THUẬT INVERTER, ta có thể thấy rõ là  Inverter Lưu Điện Hòa Pha có 3 bộ phận chủ đạo sau đây :

I/. Bộ phận 1 : Nâng áp.

Bộ nâng áp này có chức năng nâng áp lưu trữ lên mức áp định chuẩn cho việc tao ra điện áp 220VAC / 50Hz hoàn toàn tương dung với điện lưới Fo.

–  Mức áp lưu trữ có thể là (+)12VDC, (+)24VDC, (+)100VDC hay các mức điện áp khác, nhưng phải tạo ra được mức điện áp định chuẩn +310VDC và -310VDC.

–  Điện áp định chuẩn này được quyết định là do điện áp đỉnh dương (+)310VDC và điện áp đỉnh âm (-)310VDC của điện lưới Fo mà có. Trong đó cụm từ Điện lưới 220VAC là chỉ điện thế trung bình của dòng điện lưới mà thôi.

đồ hình dao động ký dòng / áp điện 220VAC

II/. Bộ phận 2 : Tín hiệu điều khiển.

Bộ tín hiệu có nhiệm vụ thiết lập (hoặc chọn) dao động hình Sin chuẩn 50Hz rồi đưa vào mạch PWM để tạo chuỗi xung điều khiển. Chuỗi xung này sẽ được đưa vào bộ phận tiếp theo.

III/. Bộ khuếch đại công suất lớn lớp D dùng cầu H

a/. Sơ lược về khuếch đại công suất :

Mạch khuếch đại hay bộ khuếch đại, đôi khi gọi gọn là khuếch đại, là một thiết bị hoặc linh kiện bất kỳ nào, sử dụng một lượng công suất nhỏ ở đầu vào để điều khiển một luồng công suất lớn ở đầu ra. Trong các ứng dụng thông dụng, thuật ngữ này hiện nay được dùng chủ yếu cho các bộ khuếch đại điện tử và thông thường là các ứng dụng thu và tái tạo tín hiệu điện tử.

Có nhiều loại mạch khuếch đại điện tử cho nhiều ứng dụng khác nhau. Những mạch khuếch đại thông dụng nhất là khuếch đại điện tử, thường sử dụng trong vô tuyến truyền thanh và truyền hình, như các máy phát và máy thu sóng vô tuyến, các hệ thống âm thanh độ trung thực cao, high fidelity (“hi-fi”) các máy vi tính và các thiết bị số khác. Các thành phần chủ yếu là các linh kiện tích cực như đèn điện tử chân không, transistor, FET, MOSFET, IGBT, GateSCR và các linh kiện điện tử tân tiến khác.

Thuật ngữ “khuếch đại công suất” là thuật ngữ chỉ các mạch có mối liên hệ giữa lượng công suất đưa đến tải và lượng công suất lấy từ nguồn nuôi. Thông thường mạch khuếch đại công suất được thiết kế cho mạch khuếch đại sau cùng trong một chuỗi các tầng, và tầng này được thiết kế với sự quan tâm nhiều về hiệu suất. Vì lý do đó các mạch khuếch đại công suất thường được sử dụng các lớp khuếch đại có hiệu suất cao.

b/. Các lớp khuếch đại

Các mạch khuếch đại được phân chia thành các lớp theo góc dẫn của tín hiệu đầu vào khi đi qua mạch khuếch đại.

Lớp A

Khi hiệu suất không phải là vấn đề đáng quan tâm, đa số các mạch khuếch đại tuyến tính tín hiệu nhỏ được thiết kế ở Lớp A. Điều đó có nghĩa là các thiết bị đầu ra luôn làm việc ở trong vùng dẫn. Các mạch khuếch đại Lớp A thường tuyến tính và ít phức tạp hơn các lớp khác, nhưng hiệu suất lại rất kém. Loại mạch khuếch đại này thường được sử dụng nhiều ở các tầng khuếch đại tín hiệu nhỏ, hoặc các tầng công suất thấp.

Lớp B

Trong các mạch khuếch đại Lớp B, sẽ có 2 linh kiện đầu ra (hoặc 2 bộ linh kiện), mỗi linh kiện sẽ lần lượt dẫn trong đúng 180 độ của tín hiệu vào (hay đúng nửa chu kỳ).

Lớp AB

Các mạch khuếch đại Lớp AB được phối hợp giữa 2 Lớp A và Lớp B, làm tăng cường độ tuyến tính của các tín hiệu nhỏ, sẽ có góc dẫn lớn hơn 180 độ tùy thuộc vào sự lưa chọn của nhà thiết kế. Thông thường chúng được sử dụng trong các mạch khuếch đại tần số thấp như hệ thống âm thanh và Hi-Fi, do có sự phối hợp giữa hiệu suất và độ tuyến tính hoặc các thiết bị mà cả hiệu suất lẫn độ tuyến tính đều có tầm quan trọng như nhau.

Lớp C

Các mạch khuếch đại Lớp C thông thường được dùng trong các mạch khuếch đại tần số sóng vô tuyến công suất cao, có góc dẫn nhỏ hơn 180 độ của tín hiệu vào. Độ tuyến tính không được tốt nhưng không ảnh hưởng gì vì chỉ khuếch đại một tần số duy nhất. Tín hiệu sẽ được phục hồi thành hình sin nhờ các mạch cộng hưởng và hiệu suất cao hơn các mạch khuếch đại Lớp A, B và AB.

Lớp D

Các mạch khuếch đại Lớp D, hay còn gọi là các mạch khuếch đại điều biến độ rộng xung, sử dụng kỹ thuật chuyển mạch để đạt được hiệu suất rất cao (từ 90% đến 98,5% ở các mạch khuếch đại hiện đại). Vì nó chỉ cho phép các linh kiện chỉ ở dạng hoàn toàn dẫn hoặc không dẫn, nên tiêu tán nhiệt trên linh kiện sẽ là tối thiểu. Các mạch khuếch đại kiểu đóng ngắt hiện đại sử dụng kỹ thuật số, thí dụ như kỹ thuật điều biến sigma-delta, cho độ trung thực tối ưu.

Các lớp khác

Có vài loại mạch khuếch đại lớp khác, mặc dù nó chỉ là biến thể của các loại ban đầu. Thí dụ như mạch khuếch đại Lớp H và Lớp G được xem như biến thể của lớp D theo độ lớn nguồn cung cấp (theo dạng bước hoặc liên tục) tùy thuộc vào tín hiệu đầu vào. Lượng tiêu tán nhiệt có thể giảm bớt, do điện áp rơi trên các linh kiện rất thấp. Loại này có thể kết hợp với các lớp kinh điển. Các mạch khuếch đại kiểu này thường phức tạp và thường chỉ sử dụng cho một số ứng dụng đặc biệt, thí dụ như trong các tầng công suất rất lớn. Tương tự như vậy, các mạch khuếch đại Lớp E và Lớp F thường được ứng dụng ở tần số vô tuyến khi hiệu suất của các lớp truyền thống thay đổi so với những giá trị thực tế. Các lớp này sử dụng các mạch điều hưởng họa tần bậc cao ở mạng đầu ra, để tăng cường hiệu suất, và có thể xem như hậu duệ của Lớp C do các đặc tính góc dẫn của chúng.

Mạch tương đương của khuếch đại lớp E

c/. Cầu H khuếch đại công suất lớp D.

Miêu tả giản đơn thì mạch khuếch đại công suất cầu H gồm 4 van đóng mở điện tử dùng linh kiện công suất là transistor, FET, MOSFET hay IGBT tạo thành hình chữ H.

Mô hình mạch cầu H.

Trong hình, S1; S2; S3; S4 lần lượt là các van dùng linh kiện điện tử. Tín hiệu điều khiển từ PWM tạo ra được đưa vào để điều khiển lần lượt các van điện tử này.

–  Khi đóng S1 và S4, ta đã cho A nối với cực dương (+) và B nối với cực âm (-) của nguồn, một dòng điện chạy từ nguồn dương – qua S1 – qua động cơ – qua S4 – về mass làm điện áp qua motor có chiều dương (mô phỏng bán kỳ dương của Fo).

–  Ngược lại, khi đóng S2 và S3, dòng điện qua Motor theo chiều âm, mô phỏng bán kỳ âm của Fo.

–  Khi đóng mở S1 + S4 rồi đến S2 + S3 luân phiên 50 lần / giây thì dòng điện qua tải (là motor trong hình) đã mô phỏng dòng điện xoay chiều 220VAC / 50Hz.

–  Tín hiệu PWM là tín hiệu đã được điều biến độ rộng xung theo dạng Sin của Fo nên dòng / áp qua tải Motor sẽ mô phỏng chính xác dòng điện xoay chiều hình Sin / 220VAC / 50Hz. Tuy nhiên nó vẫn là chuỗi xung, chưa có dạng Sin chuẩn tắc (Sine Modified).

–  Mạch Giải điều biến lớp D của bộ khuếch đại sẽ HOÀN DẠNG dòng điện xoay chiều hình Sin 220VAC / 50Hz chuẩn tắc của Fo (Pure Sine Wave), do đó có thể đấu nối trực tiếp dòng điện do Inverter Lưu Điện Hòa Pha vào điện lưới Fo. Hoàn tất quá trình hòa pha.

——————–

Thân ái.

Wambuakim

 

 

10.722 Trả lời “KỸ THUẬT INVERTER – Phụ lục 4 : mạch cầu H khuếch đại công suất lớp D”

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    1. Inactive ingredients in the tablet formulation are lactose monohydrate, microcrystalline cellulose; sodium lauryl sulfate, sodium chloride, hypromellose phthalate, hypromellose, triethyl citrate, anhydrous lactose, crospovidone, stearic acid, magnesium stearat