🔌 变压器计算器（匝数比、副边电压、电流与容量）Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA)

使用说明与常见问题How-to & FAQ

「变压器计算器（匝数比、副边电压、电流与容量）」是什么？What is the Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) tool?

理想变压器：Vp/Vs = Np/Ns = Is/Ip。可由匝数算副边电压，或由两侧电压算匝数比；再填容量（VA）或副边电流，得到两侧电流，并判断升压/降压。本地处理。Ideal transformer: Vp/Vs = Np/Ns = Is/Ip. Get the secondary voltage from the turns, or the turns ratio from both voltages; add the rating (VA) or the secondary current to get both currents, and see whether it steps up or down. Processed locally.

如何使用「变压器计算器（匝数比、副边电压、电流与容量）」？How do I use the Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) tool?

在「变压器计算器（匝数比、副边电压、电流与容量）」中，填写「已知」、「原边电压 Vp（V）」、「原边匝数 Np」、「副边匝数 Ns」、「副边电压 Vs（V）」等参数，结果会随输入实时计算并显示在下方。In the Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA): Fill in "Known", "Primary voltage Vp (V)", "Primary turns Np", "Secondary turns Ns", "Secondary voltage Vs (V)"; results are recalculated instantly as you type.

电流为什么和电压反比？Why is current inversely proportional to voltage?

理想变压器两侧功率相等：Vp·Ip = Vs·Is。所以电压降为 1/10 时，电流升为 10 倍。In an ideal transformer the power on both sides is equal: Vp·Ip = Vs·Is. When the voltage drops to one tenth, the current rises tenfold.

能举个计算实例吗？Can you show a worked example?

例如在「变压器计算器（匝数比、副边电压、电流与容量）」中填 已知 = 匝数 + 原边电压，原边电压 Vp（V） = 240，原边匝数 Np = 1000，副边匝数 Ns = 100，结果区显示：匝数比 Np : Ns：10 : 1；副边电压 Vs：24 V；类型：降压变压器；ℹ 按理想变压器计算（无损耗、无漏磁）；实际变压器效率约 95–99%，带载时副边电压会略低For example, entering Known = Turns + primary voltage, Primary voltage Vp (V) = 240, Primary turns Np = 1000, Secondary turns Ns = 100 in the Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) gives: Turns ratio Np : Ns: 10 : 1; Secondary voltage Vs: 24 V; Type: step-down transformer; ℹ ideal transformer (no losses or leakage); real transformers are about 95–99% efficient and the secondary voltage drops a little under load

哪些输入会被检查？Which inputs are validated?

「变压器计算器（匝数比、副边电压、电流与容量）」会检查这些输入——「原边电压 Vp（V）」：必须填写，须大于 0且不大于 10,000,000；「原边匝数 Np」：须大于 0且不大于 1,000,000,000；「副边匝数 Ns」：须大于 0且不大于 1,000,000,000；「副边电压 Vs（V）」：须大于 0且不大于 10,000,000；「容量（VA，可选）」：可留空；填写时须大于 0且不大于 1,000,000,000,000；「副边电流 Is（A，可选）」：可留空；填写时须大于 0且不大于 1,000,000,000；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) checks its inputs — "Primary voltage Vp (V)": required, must be more than 0 and at most 10,000,000; "Primary turns Np": must be more than 0 and at most 1,000,000,000; "Secondary turns Ns": must be more than 0 and at most 1,000,000,000; "Secondary voltage Vs (V)": must be more than 0 and at most 10,000,000; "Rating (VA, optional)": optional; if given it must be more than 0 and at most 1,000,000,000,000; "Secondary current Is (A, optional)": optional; if given it must be more than 0 and at most 1,000,000,000; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「变压器计算器（匝数比、副边电压、电流与容量）」的设置：「已知」可选 匝数 + 原边电压、两侧电压（默认 匝数 + 原边电压）；「原边电压 Vp（V）」默认 240；「原边匝数 Np」默认 1000；「副边匝数 Ns」默认 100；「副边电压 Vs（V）」默认 24；「容量（VA，可选）」可留空；「副边电流 Is（A，可选）」可留空。每次生成结果都按当前设置处理。Settings in the Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) — "Known": Turns + primary voltage, Both voltages (default Turns + primary voltage); "Primary voltage Vp (V)" default 240; "Primary turns Np" default 1000; "Secondary turns Ns" default 100; "Secondary voltage Vs (V)" default 24; "Rating (VA, optional)" optional; "Secondary current Is (A, optional)" optional. The result always uses the current settings.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「变压器计算器（匝数比、副边电压、电流与容量）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.

「变压器计算器（匝数比、副边电压、电流与容量）」免费吗？需要注册吗？Is the Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) free? Do I need an account?

「变压器计算器（匝数比、副边电压、电流与容量）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Transformer Calculator (Turns Ratio, Secondary Voltage, Current and VA) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.