Power

12V to 220V DC Boost Module (MAX1771)

A MAX1771-based DC-DC boost converter that steps 12V up to 220V DC, designed for high-voltage loads such as Nixie tubes and tube amplifiers.

Power boost converterhigh voltageNixie tubetube amplifier MAX1771

Official path: https://oshwhub.com/aknice/zhi-liu-sheng-gao-ya-mo-kuai

12V to 220V DC Boost Module (MAX1771)

01 Overview

This module is a DC-DC boost converter based on the MAX1771 current-mode PWM controller, stepping 12V DC input up to 220V DC output.

It solves the problem of low-voltage DC supplies not being able to directly drive high-voltage devices, providing a compact and efficient solution for Nixie tubes, tube amplifiers, and other high-voltage DC loads.

The board includes a power inductor, MOSFET, flyback diode, and feedback resistor divider; output voltage is adjustable via a trimmer potentiometer to suit different loads.

Unlike isolated supplies, this is a non-isolated boost topology with common ground between input and output, so safety precautions are necessary.

Ideal for DIY vacuum tube projects, Nixie tube clocks, high-voltage testing, and as a bench high-voltage DC source.

02 Hardware

  • Controller: MAX1771 current-mode boost controller with integrated gate driver, switching frequency ~300kHz.
  • Input: 12V DC, recommended supply current ≥2A depending on load; input terminals VIN/GND.
  • Output: up to 220V DC, set by feedback resistor divider; output terminals VOUT/GND.
  • Power inductor: e.g., 100µH, must handle peak current; saturation current should exceed maximum switch current.
  • MOSFET: N-MOSFET (e.g., IRF540); consider heatsinking or choose low RDS(on) device.
  • Flyback diode: fast recovery type (e.g., UF4007), reverse voltage rating must exceed output voltage.
  • Output capacitor: ≥10µF/250V to smooth output and reduce ripple.
  • Feedback network: resistor divider sets output voltage; typical formula VOUT = 1.5V × (1 + R1/R2); on-board trimmer provided.
  • Layout notes: keep power loop traces short and thick to minimize parasitic inductance; route feedback away from switching node.

03 Software flow

1. Pure hardware module; no firmware required, works on power-up.

2. For dynamic voltage adjustment, an external MCU (e.g., ESP32) can adjust the feedback reference via PWM or DAC.

3. When connecting an MCU, filter the PWM signal with an RC network before feeding the feedback pin, or use a DAC directly.

4. Implement PID or lookup-table control in software to adjust PWM duty cycle based on target voltage.

5. On startup, ramp voltage gradually to avoid inrush current.

6. Monitor output voltage and current; shut down PWM immediately on overvoltage or overcurrent.

7. On power-down, control a discharge circuit via software to avoid residual high voltage on output capacitors.

04 Core points

MAX1771 boost topology, non-isolated, input and output share ground; mind safety.

Output voltage determined by feedback resistor ratio; typical formula: VOUT = 1.5V × (1 + R1/R2).

Efficiency about 80-90%, depending on input voltage, load, and component selection.

Switching frequency ~300kHz; inductor selection must match frequency and current.

Output voltage may rise under no-load or light-load; consider adding a dummy load or minimum load.

High-voltage output capacitors need discharge resistors to avoid residual charge after power-off.

中文

电源

12V升220V直流升高压模块（MAX1771）

基于MAX1771的12V转220V直流升压模块，适合辉光管、胆机等高压直流负载。

电源 boost converterhigh voltageNixie tubetube amplifier MAX1771

官方路径: https://oshwhub.com/aknice/zhi-liu-sheng-gao-ya-mo-kuai

12V升220V直流升高压模块（MAX1771）

01 项目概述

该模块是一款基于MAX1771电流模式PWM控制器的直流升压转换器，可将12V直流输入升压至最高220V直流输出。

它解决了低电压直流电源无法直接驱动高压设备的问题，为辉光管、胆机等需要高压直流供电的场景提供了紧凑、高效的解决方案。

模块板载功率电感、MOSFET、续流二极管和反馈分压电阻，输出电压可通过电位器调节，适应不同负载需求。

不同于隔离式电源，该模块为非隔离升压拓扑，输入与输出共地，使用时需注意安全。

适用于DIY电子管设备、Nixie管时钟、高压测试等场合，也可作为实验室高压直流源。

02 项目硬件描述

  • 控制器： MAX1771电流模式升压控制器，内置开关管驱动，开关频率约300kHz。
  • 输入： 12V直流，建议电流≥2A（视负载功率），输入端子VIN/GND。
  • 输出： 最高220V直流，通过反馈电阻分压调节，输出端子VOUT/GND。
  • 功率电感： 如100µH，需能承受峰值电流，饱和电流应大于最大开关电流。
  • 开关管： N-MOSFET（如IRF540），需配合散热器或选择低导通电阻器件。
  • 续流二极管： 快恢复二极管（如UF4007），反向耐压需高于输出电压。
  • 输出电容： ≥10µF/250V，用于平滑输出电压，降低纹波。
  • 反馈网络： 电阻分压器设置输出电压，典型公式VOUT = 1.5V × (1 + R1/R2)，板上带可调电阻。
  • 布局注意： 功率回路走线应短而粗，避免寄生电感；反馈走线远离开关节点。

03 项目软件流程描述

1. 纯硬件模块，无需固件，上电即可工作。

2. 如需动态调压，可外接MCU（如ESP32）通过PWM或DAC控制反馈基准，实现输出电压调节。

3. 连接MCU时，将PWM信号经RC滤波后接入反馈引脚，或使用DAC直接驱动。

4. 软件中需实现PID或查表控制，根据目标电压调整PWM占空比。

5. 启动时先输出低电压，逐步升压，避免浪涌电流。

6. 监控输出电压和电流，过压或过流时立即关断PWM。

7. 掉电时，通过软件控制放电回路，避免输出电容残留高压。

04 项目核心点

MAX1771升压拓扑，非隔离，输入输出共地，注意安全。

输出电压由反馈电阻比决定，典型公式：VOUT = 1.5V × (1 + R1/R2)。

效率约80-90%，具体取决于输入电压、负载和元件选择。

开关频率约300kHz，电感选择需匹配频率和电流。

空载或轻载时输出电压可能升高，建议加假负载或最小负载。

高压输出电容需放电电阻，避免断电后残留高压。