C2000驱动的高频逆变器：全桥DC-DC与DC-AC转换器设计详解
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本篇文档详细介绍了如何利用Texas Instruments (TI) 的 C2000 系列微控制器 C2000™ TMS320F28069 在高频逆变器中实现电压馈电全桥直流-直流(DC-DC)转换器和直流-交流(DC-AC)变换器的设计与应用。高频逆变器在不间断电源系统、交流电机驱动、感应加热以及可再生能源系统中发挥着关键作用，其核心是通过控制桥型电路进行正弦脉宽调制(SPWM)，从而生成所需的交流输出电压。
高频逆变器设计的关键在于小型化和轻量化，而这部分由一个隔离的电压馈电推挽或全桥直流-直流转换器和随后的DC-AC转换器共同实现。电压馈电全桥DC-DC转换器通过高效的高频操作，能够降低体积并提高能效，同时保持良好的输出稳定性。
在本文档中，作者Atul Singhand Jabir VS详细介绍了C2000系列微控制器在这些转换器中的应用，包括控制策略、硬件接口、算法优化以及可能的软件实现。文档还提供了项目协作材料和源代码，这些资源可以从TI官网链接：http://www.ti.co 下载，这对于理解和实现类似的高频逆变器设计具有重要的参考价值。
该技术涉及的要点包括但不限于：
1. C2000微控制器的优势：C2000系列以其高性能、低功耗和丰富的模拟和数字信号处理能力，非常适合高频逆变器的实时控制需求。
2. 电压馈电全桥结构：这种结构允许在高压输入下工作，通过高频开关管实现高效率的电压转换，减少了滤波器尺寸。
3. SPWM控制：C2000的数字信号处理能力支持精确的SPWM算法，确保了输出电压的质量和相位准确性。
4. 软件开发和调试：文中可能会涉及到使用TI提供的开发工具和库函数，如Code Composer Studio (CCS)等，来简化设计过程。
5. 安全性与隔离：由于涉及的是隔离DC-DC转换，文档还会强调了电磁兼容性和隔离方案的重要性。
6. 实际应用示例：通过提供实例，读者可以了解如何将理论知识转化为实际的电路设计和系统集成。
这篇文档为工程师们提供了一个关于C2000在高频逆变器中如何构建高效、紧凑的电压馈电全桥DC-DC和DC-AC转换器的全面指南，是深入理解该领域技术的一个重要参考资料。
made to the high-resolution pulse width modulator (HRPWM) module to allow for dual-edge control (frequency
modulation).
Analog comparators with internal 10-bit references have been added and can be routed directly to control the
pulse width modulation (PWM) outputs. The analog-to-digital converter (ADC) converts from 0 to 3.3-V fixed full
scale range and supports ratio-metric VREFHI/VREFLO references. The ADC interface has been optimized for
low overhead and latency. The above features make the F2806x Piccolo suitable for handling both the stages of
the High-Frequency Inverter.
The main blocks of the High-Frequency Inverter include:
• DC-DC isolation stage
• DC-AC converter section
3 DC-DC Isolation Stage - High-Frequency Inverter
The selection of the DC-DC isolation stage for the High-Frequency Inverter depends on the kVA requirements of
the inverter. The power supply topologies suitable for the High-Frequency Inverter includes push-pull, half-bridge
and the full-bridge converter as the core operation occurs in both the quadrants, thereby, increasing the power
handling capability to twice of that of the converters operating in single quadrant (forward and flyback converter).
The push-pull and half-bridge require two switches while the full-bridge requires four switches. Generally, the
power capability increases from push-pull to half-bridge to full-bridge.
V
OUT
R
+
D2
C
n
p
V
IN
PUSH
PULL
Q2 Q1
n
s
n
p
n
s
D1
L
Figure 3-1. Push-Pull Topology
The Push-Pull topology is basically a forward converter with two primaries. The primary switches alternately
power their respective windings. When Q1 is active, current flows through D1. When Q2 is active, current flows
through D2. The secondary is arranged in a center tapped configuration as shown in Figure 3-1. The output filter
sees twice the switching frequency of either Q1 or Q2. The transfer function is similar to the forward converter,
where “D” is the duty cycle of a given primary switch, which accounts for the “2X” term. When neither Q1 nor Q2
are active, the output inductor current splits between the two output diodes.
A transformer reset winding shown on the forward topology is not necessary, the topology is self resetting.
Ns
V V D
out in
Np
2= ´ ´ ´
(1)
3.1 Half Bridge Converter
The Half Bridge converter is similar to the Push-Pull converter, but a center tapped primary is not required. The
reversal of the magnetic field is achieved by reversing the direction of the primary winding current flow. In this
case, two capacitors, C1 and C2, are required to form the DC input mid-point. Transistors Q1 and Q2 are turned
ON alternately to avoid a supply short circuit, in which case the duty cycle d must be less than 0.5.
DC-DC Isolation Stage - High-Frequency Inverter
www.ti.com
4 Voltage Fed Full Bridge DC-DC and DC-AC Converter for High-Frequency
Inverter Using C2000
SPRABW0D – MAY 2014 – REVISED APRIL 2021
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