TMS320x2833x ePWM模块技术参考手册

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"TMS320x2833x和2823x系列芯片的增强型脉宽调制（ePWM）模块参考指南，涵盖了从2008年10月到2009年7月的更新内容。该手册详细介绍了ePWM模块的各个子模块，包括时间基（TB）、比较计数器（CC）、动作限定器（AQ）、死区生成器（DB）、PWM切削器（PC）、故障区（TZ）和事件触发（ET）子模块，以及在电源拓扑中的应用。" 在这个资源中，主要关注的是TMS320x2833x和2823x微控制器系列的增强型脉宽调制器（ePWM）功能。ePWM模块是一个集成在这些处理器中的关键组件，用于精确控制数字信号的占空比，广泛应用于电机控制、电源转换和其他需要脉冲宽度调制的应用中。 1. **子模块概述**：ePWM模块由多个子模块组成，每个子模块都有特定的功能。例如，时间基子模块（TB）负责设置PWM周期，比较计数器子模块（CC）则确定PWM的高电平或低电平持续时间。 2. **时间基（TB）子模块**：TB子模块提供了基本的时间基准，可以配置计数器来实现不同频率的PWM信号输出。它还可以设置PWM的周期和占空比。 3. **比较计数器（CC）子模块**：与时间基子模块配合，设置PWM的边界，决定何时切换输出状态。通过调整比较值，可以改变PWM的占空比。 4. **动作限定器（AQ）子模块**：这个子模块处理条件触发的事件，比如根据输入信号或内部状态改变PWM输出。 5. **死区生成器（DB）子模块**：在上下沿之间添加死区时间，防止开关器件的直通现象，保护功率开关电路。 6. **PWM切削器（PC）子模块**：用于降低PWM输出的高频噪声，改善电磁兼容性（EMC）。 7. **故障区（TZ）子模块**：监测系统状态，当检测到故障时，可以立即停止或改变PWM输出，提高系统安全性。 8. **事件触发（ET）子模块**：根据外部事件或内部定时器触发其他子模块的操作，实现灵活的控制逻辑。 9. **在电源拓扑中的应用**：手册详细介绍了如何使用ePWM模块控制各种电源拓扑，如独立频率的降压转换器、相同频率的降压转换器、半桥逆变器、三相电机驱动等。提供了多种配置方案，以满足不同系统需求。这份数据手册为设计者提供了一个深入理解TMS320x2833x和2823x系列芯片ePWM模块的全面指南，对于利用这些微控制器开发高效、可靠的电力电子系统具有重要价值。

Introduction

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Table 1. ePWM Module Control and Status Register Set Grouped by Submodule

Offset Size

Name

(1)

(x16) Shadow EALLOW Description

Time-Base Submodule Registers

TBCTL 0x0000 1 No Time-Base Control Register

TBSTS 0x0001 1 No Time-Base Status Register

TBPHSHR 0x0002 1 No Extension for HRPWM Phase Register

(2)

TBPHS 0x0003 1 No Time-Base Phase Register

TBCTR 0x0004 1 No Time-Base Counter Register

TBPRD 0x0005 1 Yes Time-Base Period Register

Counter-Compare Submodule Registers

CMPCTL 0x0007 1 No Counter-Compare Control Register

CMPAHR 0x0008 1 Yes Extension for HRPWM Counter-Compare A Register

(2)

CMPA 0x0009 1 Yes Counter-Compare A Register

CMPB 0x000A 1 Yes Counter-Compare B Register

Action-Qualifier Submodule Registers

AQCTLA 0x000B 1 No Action-Qualifier Control Register for Output A (EPWMxA)

AQCTLB 0x000C 1 No Action-Qualifier Control Register for Output B (EPWMxB)

AQSFRC 0x000D 1 No Action-Qualifier Software Force Register

AQCSFRC 0x000E 1 Yes Action-Qualifier Continuous S/W Force Register Set

Dead-Band Generator Submodule Registers

DBCTL 0x000F 1 No Dead-Band Generator Control Register

DBRED 0x0010 1 No Dead-Band Generator Rising Edge Delay Count Register

DBFED 0x0011 1 No Dead-Band Generator Falling Edge Delay Count Register

Trip-Zone Submodule Registers

TZSEL 0x0012 1 Yes Trip-Zone Select Register

TZCTL 0x0014 1 Yes Trip-Zone Control Register

(3)

TZEINT 0x0015 1 Yes Trip-Zone Enable Interrupt Register

(3)

TZFLG 0x0016 1 Trip-Zone Flag Register

(3)

TZCLR 0x0017 1 Yes Trip-Zone Clear Register

(3)

TZFRC 0x0018 1 Yes Trip-Zone Force Register

(3)

Event-Trigger Submodule Registers

ETSEL 0x0019 1 Event-Trigger Selection Register

ETPS 0x001A 1 Event-Trigger Pre-Scale Register

ETFLG 0x001B 1 Event-Trigger Flag Register

ETCLR 0x001C 1 Event-Trigger Clear Register

ETFRC 0x001D 1 Event-Trigger Force Register

PWM-Chopper Submodule Registers

PCCTL 0x001E 1 PWM-Chopper Control Register

High-Resolution Pulse Width Modulator (HRPWM) Extension

Registers

HRCNFG 0x0020 1 Yes HRPWM Configuration Register

(2) (3)

(1)

Locations not shown are reserved.

(2)

These registers are only available on ePWM instances that include the high-resolution PWM extension. Otherwise these

locations are reserved. These registers are described in the TMS320x2833x, 2823x High-Resolution Pulse Width Modulator

(HRPWM) Reference Guide (SPRUG02) . See the device specific data manual to determine which instances include the

HRPWM.

(3)

EALLOW protected registers as described in the specific device version of the System Control and Interrupts Reference Guide

listed in Related Documentation From Texas Instruments.

TMS320x2833x, 2823x Enhanced Pulse Width Modulator (ePWM) Module SPRUG04A–October 2008–Revised July 2009

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ePWM Submodules

2 ePWM Submodules

Seven submodules are included in every ePWM peripheral. Each of these submodules performs specific

tasks that can be configured by software.

2.1 Overview

Table 2 lists the seven key submodules together with a list of their main configuration parameters. For

example, if you need to adjust or control the duty cycle of a PWM waveform, then you should see the

counter-compare submodule in Section 2.3 for relevant details.

Table 2. Submodule Configuration Parameters

Submodule Configuration Parameter or Option

Time-base (TB)

• Scale the time-base clock (TBCLK) relative to the system clock (SYSCLKOUT).

• Configure the PWM time-base counter (TBCTR) frequency or period.

• Set the mode for the time-base counter:

– count-up mode: used for asymmetric PWM

– count-down mode: used for asymmetric PWM

– count-up-and-down mode: used for symmetric PWM

• Configure the time-base phase relative to another ePWM module.

• Synchronize the time-base counter between modules through hardware or software.

• Configure the direction (up or down) of the time-base counter after a synchronization event.

• Configure how the time-base counter will behave when the device is halted by an emulator.

• Specify the source for the synchronization output of the ePWM module:

– Synchronization input signal

– Time-base counter equal to zero

– Time-base counter equal to counter-compare B (CMPB)

– No output synchronization signal generated.

Counter-compare (CC)

• Specify the PWM duty cycle for output EPWMxA and/or output EPWMxB

• Specify the time at which switching events occur on the EPWMxA or EPWMxB output

Action-qualifier (AQ)

• Specify the type of action taken when a time-base or counter-compare submodule event occurs:

– No action taken

– Output EPWMxA and/or EPWMxB switched high

– Output EPWMxA and/or EPWMxB switched low

– Output EPWMxA and/or EPWMxB toggled

• Force the PWM output state through software control

• Configure and control the PWM dead-band through software

Dead-band (DB)

• Control of traditional complementary dead-band relationship between upper and lower switches

• Specify the output rising-edge-delay value

• Specify the output falling-edge delay value

• Bypass the dead-band module entirely. In this case the PWM waveform is passed through

without modification.

PWM-chopper (PC)

• Create a chopping (carrier) frequency.

• Pulse width of the first pulse in the chopped pulse train.

• Duty cycle of the second and subsequent pulses.

• Bypass the PWM-chopper module entirely. In this case the PWM waveform is passed through

without modification.

SPRUG04A–October 2008–Revised July 2009 TMS320x2833x, 2823x Enhanced Pulse Width Modulator (ePWM) Module

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ePWM Submodules

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Table 2. Submodule Configuration Parameters (continued)

Submodule Configuration Parameter or Option

Trip-zone (TZ)

• Configure the ePWM module to react to one, all, or none of the trip-zone pins .

• Specify the tripping action taken when a fault occurs:

– Force EPWMxA and/or EPWMxB high

– Force EPWMxA and/or EPWMxB low

– Force EPWMxA and/or EPWMxB to a high-impedance state

– Configure EPWMxA and/or EPWMxB to ignore any trip condition.

• Configure how often the ePWM will react to each trip-zone pins :

– One-shot

– Cycle-by-cycle

• Enable the trip-zone to initiate an interrupt.

• Bypass the trip-zone module entirely.

Event-trigger (ET) • Enable the ePWM events that will trigger an interrupt.

• Enable ePWM events that will trigger an ADC start-of-conversion event.

• Specify the rate at which events cause triggers (every occurrence or every second or third

occurrence)

• Poll, set, or clear event flags

Code examples are provided in the remainder of this document that show how to implement various

ePWM module configurations. These examples use the constant definitions shown in Example 1. These

definitions are also used in the C2833x/2823x C/C++ Header Files and Peripheral Examples (SPRC530) .

Example 1. Constant Definitions Used in the Code Examples

// TBCTL (Time-Base Control)

// = = = = = = = = = = = = = = = = = = = = = = = = = =

// TBCTR MODE bits

#define TB_COUNT_UP 0x0

#define TB_COUNT_DOWN 0x1

#define TB_COUNT_UPDOWN 0x2

#define TB_FREEZE 0x3

// PHSEN bit

#define TB_DISABLE 0x0

#define TB_ENABLE 0x1

// PRDLD bit

#define TB_SHADOW 0x0

#define TB_IMMEDIATE 0x1

// SYNCOSEL bits

#define TB_SYNC_IN 0x0

#define TB_CTR_ZERO 0x1

#define TB_CTR_CMPB 0x2

#define TB_SYNC_DISABLE 0x3

// HSPCLKDIV and CLKDIV bits

#define TB_DIV1 0x0

#define TB_DIV2 0x1

#define TB_DIV4 0x2

// PHSDIR bit

#define TB_DOWN 0x0

#define TB_UP 0x1

// CMPCTL (Compare Control)

// = = = = = = = = = = = = = = = = = = = = = = = = = =

LOADAMODE and LOADBMODE bits

#define CC_CTR_ZERO 0x0

#define CC_CTR_PRD 0x1

#define CC_CTR_ZERO_PRD 0x2 #

define CC_LD_DISABLE 0x3

// SHDWAMODE and SHDWBMODE bits

#define CC_SHADOW 0x0

#define CC_IMMEDIATE 0x1

// AQCTLA and AQCTLB (Action-qualifier Control)

// = = = = = = = = = = = = = = = = = = = = = = = = = =

// ZRO, PRD, CAU, CAD, CBU, CBD bits

TMS320x2833x, 2823x Enhanced Pulse Width Modulator (ePWM) Module SPRUG04A–October 2008–Revised July 2009

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