使用PIC16C781/782产生的高电压

The Nixie tube is a device born out of the middle
twentieth century, used to display digital information in a
human readable format. Basically, it is a high-voltage
numerical display. Today, the Nixie tube has been
replaced by more efficient, more durable, and longer last-
ing devices, such as LED displays and LCDs. However,
for this technical brief, the Nixie tube serves as an
excellent visual feedback of the PIC16C782 device’s
ability to generate high voltage from a low-voltage
source.
This technical brief introduces the boost converter
topology operating in Discontinuous mode. As an
example, a simple 9V to 170V DC-DC converter is
designed based on this topology, and is used to provide
power to a three-digit Nixie tube display. The
PIC16C782 is used to control the DC-DC converter and
provides data decoding for the display. To make the
display useful, the PICmicro
®
MCU samples a
temperature sensor and displays the results.
TB053
Generating High Voltage Using the PIC16C781/782
EQUATION 1:
Author: Ross Fosler
Microchip Technology Inc.
diL VIN
VIN = L1 → t = iL
dt L1
INTRODUCTION
The Nixie tube is a device born out of the middle The peak current is achieved the moment before Q1
twentieth century, used to display digital information in a turns off. Equati