TMS320F28035 ePWM设置手册：Piccolo增强脉宽调制模块解析

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"TMS320F28035的ePWM设置详细手册，涵盖了TMS320x2802x和2803x系列Piccolo增强型脉宽调制模块(ePWM)的相关内容，包括子模块概述、寄存器映射、ePWM子模块详解以及在电源拓扑中的应用。" TMS320F28035是一款高性能的数字信号处理器，广泛应用于工业控制、电机驱动等领域。其中，ePWM模块是其核心功能之一，用于生成可编程的脉宽调制信号，适用于各种电源转换和电机控制应用。 1. 子模块概述 ePWM模块由多个子模块组成，这些子模块协同工作以实现复杂的定时和比较功能。它们包括时间基(TB)子模块、计数器比较(CC)子模块、动作限定器(AQ)子模块、死区时间生成器(DB)子模块、PWM切削(PC)子模块、行程区(TZ)子模块、事件触发(ET)子模块、数字比较(DC)子模块等。 2. 时间基(TB)子模块时间基子模块提供了基本的时间基准，可以配置为周期性的或单次触发的定时器。它包含计数器，可以向上或向下计数，并通过比较值来触发事件。 3. 计数器比较(CC)子模块计数器比较子模块允许用户设置多个比较点，当计数器的值与这些比较点匹配时，可以产生中断或者触发其他操作。 4. 动作限定器(AQ)子模块动作限定器用于根据事件条件定义输出动作，如设置或清除输出，或者在特定条件下使能或禁用其他子模块。 5. 死区时间生成器(DB)子模块死区时间生成器在高侧和低侧开关之间插入一段死区时间，以防止开关交叉导通，提高系统稳定性。 6. PWM切削(PC)子模块 PWM切削子模块用于降低输出PWM信号的高频噪声，通过在PWM波形上添加随机抖动来实现。 7. 行程区(TZ)子模块行程区子模块可以设定安全限制，当输入或输出超出预设范围时，可以触发保护机制。 8. 事件触发(ET)子模块事件触发子模块用于响应外部事件，可以设置条件来触发ePWM的特定操作。 9. 数字比较(DC)子模块数字比较子模块提供了一种灵活的方式来比较输入信号和预设值，根据比较结果触发事件。 3. 应用于电源拓扑 ePWM模块在电源拓扑中的应用非常广泛，例如： - 控制多个频率独立的降压转换器，每个转换器都可以独立配置。 - 控制多个频率相同的降压转换器，可以实现同步调制，提高效率。 - 控制半桥转换器，用于电机驱动。 - 控制双三相逆变器，适用于交流感应电机和永磁同步电机的控制。 TMS320F28035的ePWM模块具备强大的灵活性和配置能力，能够满足复杂工业控制系统的各种需求。通过深入了解和熟练配置这些子模块，开发者可以实现高效、精确的脉宽调制控制。

EPWMxINT

EPWMxTZINT

EPWMxSOCA

EPWMxSOCB

EPWMxSYNCI

EPWMxSYNCO

Time-base(TB)module

Counter-compare(CC)module

Action-qualifier(AQ)module

Dead-band(DB)module

PWM-chopper(PC)module

Event-trigger(ET)module

Trip-zone(TZ)module

Peripheralbus

ePWMmodule

TZ1 TZ3to

EPWMxA

EPWMxB

PIE

ADC

GPIO

MUX

COMPxOUT

COMP

DigitalCompare(DC)module

EQEP1ERR

CLOCKFAIL

EMUSTOP

Introduction

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Figure 2. Submodules and Signal Connections for an ePWM Module

Figure 3 shows more internal details of a single ePWM module. The main signals used by the ePWM

module are:

• PWM output signals (EPWMxA and EPWMxB).

The PWM output signals are made available external to the device through the GPIO peripheral

described in the system control and interrupts guide for your device.

• Trip-zone signals (TZ1 to TZ6).

These input signals alert the ePWM module of fault conditions external to the ePWM module. Each

module on a device can be configured to either use or ignore any of the trip-zone signals. The TZ1 to

TZ3 trip-zone signals can be configured as asynchronous inputs through the GPIO peripheral. TZ4 is

connected to an inverted EQEP1 error signal (EQEP1ERR) from the EQEP1 module (for those devices

with an EQEP1 module). TZ5 is connected to the system clock fail logic, and TZ6 is connected to the

EMUSTOP output from the CPU. This allows you to configure a trip action when the clock fails or the

CPU halts.

• Time-base synchronization input (EPWMxSYNCI) and output (EPWMxSYNCO) signals.

The synchronization signals daisy chain the ePWM modules together. Each module can be configured

to either use or ignore its synchronization input. The clock synchronization input and output signal are

brought out to pins only for ePWM1 (ePWM module #1). The synchronization output for ePWM1

(EPWM1SYNCO) is also connected to the SYNCI of the first enhanced capture module (eCAP1).

• ADC start-of-conversion signals (EPWMxSOCA and EPWMxSOCB).

Each ePWM module has two ADC start of conversion signals . Any ePWM module can trigger a start

of conversion . Which event triggers the start of conversion is configured in the Event-Trigger

submodule of the ePWM.

• Comparator output signals (COMPxOUT).

Output signals from the comparator module in conjunction with the trip zone signals can generate

digital compare events.

• Peripheral Bus

The peripheral bus is 32-bits wide and allows both 16-bit and 32-bit writes to the ePWM register file.

TMS320x2802x, 2803x Piccolo Enhanced Pulse Width Modulator (ePWM) SPRUGE9E–December 2008–Revised March 2011

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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

TBPRDHR 0x0006 1 Yes Time Base Period High Resolution Register

(3)

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

TZDCSEL 0x0013 1 Yes Trip Zone Digital Compare 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)

HRPWR 0x0021 1 Yes HRPWM Power Register

(3) (4)

(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 device-specific High-Resolution Pulse Width Modulator (HRPWM)

Reference Guide . 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.

(4)

These registers only exist in the ePWM1 register space. They cannot be accessed from any other ePWM module's register

space.

TMS320x2802x, 2803x Piccolo Enhanced Pulse Width Modulator (ePWM) SPRUGE9E–December 2008–Revised March 2011

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Introduction

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

Offset Size

Name

(1)

(x16) Shadow EALLOW Description

HRMSTEP 0x0026 1 Yes HRPWM MEP Step Register

(3) (4)

HRPCTL 0x0028 1 Yes High Resolution Period Control Register

(3)

TBPRDHRM 0x002A 1 Writes Time Base Period High Resolution Register Mirror

(3)

TBPRDM 0x002B 1 Writes Time Base Period Register Mirror

CMPAHRM 0x002C 1 Writes Compare A High Resolution Register Mirror

(3)

CMPAM 0x002D 1 Writes Compare A Register Mirror

Digital Compare Event Registers

DCTRIPSEL 0x0030 1 Yes Digital Compare Trip Select Register

DCACTL 0x0031 1 Yes Digital Compare A Control Register

DCBCTL 0x0032 1 Yes Digital Compare B Control Register

DCFCTL 0x0033 1 Yes Digital Compare Filter Control Register

DCCAPCTL 0x0034 1 Yes Digital Compare Capture Control Register

DCFOFFSET 0x0035 1 Writes Digital Compare Filter Offset Register

DCFOFFSETCNT 0x0036 1 Digital Compare Filter Offset Counter Register

DCFWINDOW 0x0037 1 Digital Compare Filter Window Register

DCFWINDOWCNT 0x0038 1 Digital Compare Filter Window Counter Register

DCCAP 0x0039 1 Yes Digital Compare Counter Capture Register

The CMPA, CMPAHR, TBPRD, and TBPRDHR registers are mirrored in the register map (Mirror registers

include an "-M" suffix - CMPAM, CMPAHRM, TBPRDM, and TBPRDHRM). Note in the tables below, that

in both Immediate mode and Shadow mode, reads from these mirror registers result in the active value of

the register or a TI internal test value.

In Immediate Mode:

TBPRDHR 0x06 Active Active TBPRDHRM 0x2A Active TI_Internal

TBPRD 0x05 Active Active TBPRDM 0x2B Active Active

CMPAHR 0x08 Active Active CMPAHRM 0x2C Active TI_Internal

CMPA 0x09 Active Active CMPAM 0x2D Active Active

In Shadow Mode:

TBPRDHR 0x06 Shadow Shadow TBPRDHRM 0x2A Shadow TI_Internal

TBPRD 0x05 Shadow Shadow TBPRDM 0x2B Shadow Active

CMPAHR 0x08 Shadow Shadow CMPAHRM 0x2C Shadow TI_Internal

CMPA 0x09 Shadow Shadow CMPAM 0x2D Shadow Active

SPRUGE9E–December 2008–Revised March 2011 TMS320x2802x, 2803x Piccolo Enhanced Pulse Width Modulator (ePWM)

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ePWM Submodules

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2 ePWM Submodules

Eight 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 eight 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.

• Option to enable half-cycle clocking for double resolution.

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.

TMS320x2802x, 2803x Piccolo Enhanced Pulse Width Modulator (ePWM) SPRUGE9E–December 2008–Revised March 2011

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