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设计例程

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llc TI 设计例程.zip （23个子文件）

llc TI 设计例程

NPMsgImage.dll 43KB

reference sheet.pdf 18.95MB

TIDM_1001

f2837x

HV2PHILLLC

SFRAData

SFRAData.csv 9KB

.cookie 0B

.xdchelp 0B

F2837xD.ccxml 2KB

HV2PHILLLC_Base-Settings.h 6KB

F2837xS_FLASH_HV2PHILLLC.CMD 11KB

main.cfg 3KB

.cdtbuild 6KB

solution.js 7KB

SciCommsGui_32bit.c 15KB

.project_initial 2KB

PWM_HB_LLC_2PHIL_SR.c 16KB

.project 4KB

.cdtbuild_initial 6KB

.cdtproject 677B

AddWatchWindowVars.js 717B

.cproject 17KB

.ccsproject 716B

HV2PHILLLC-Main.c 69KB

Kit.xml 7KB

TIDM_1001.rar 43KB

+Vout

Vin

UCD7138

RCS

OPA365

-Vout

Ph1HS

Ph1LS

Ph2HS

PH2LS

Ph1SRA

Ph1SRB

Ph2SRA

Ph2SRB

Q10

Lr_PH1

Lr_PH2

Cr_PH2

Cr_PH1

T_PH2

T_PH1

Ipri_PH1

Ipri_PH2

CT_gain

Ipri_PH2

heavily_Filtered

Ipri_PH2_O

C_PROT

Ipri_PH1

heavily_Filtered

Ipri_PH1_O

C_PROT

Iout heavily_Filtered

Iout OC_PROT

OPA_gain

UCC27524

V_gain

TIDUCT9–January 2017

Submit Documentation Feedback

Two-Phase Interleaved LLC Resonant Converter Design With C2000™

Microcontrollers

TI Designs

Two-Phase Interleaved LLC Resonant Converter Design

With C2000™ Microcontrollers

Description

This TI Design implements a digitally-controlled, 500-

W, two-phase interleaved LLC resonant converter. The

system is controlled by a single, C2000 microcontroller

(MCU), TMS320F28379, which also generates pulse

width modulation (PWM) waveforms for all power

electronic switching devices under all operating

modes. This design implements an innovative current

sharing technique to accurately achieve current

balancing between phases.

Resources

TIDM-1001 Design Folder

controlSUITE™ Tools Folder

TMS320F28379 Product Folder

UCC27524 Product Folder

OPA365 Product Folder

UCD7138 Product Folder

ASK Our E2E Experts

Features

• Digitally-Controlled Two-Phase Interleaved LLC

Resonant DC-DC Converter

• 500-W (250 W per Phase) Full-Load Power or

42.5-A Full-Load Current

• Vin: 370-V to 410-V DC

• Vout: 12-V DC

• Resonant Frequency: 250 kHz, Switching

Frequency Range: 200 kHz to 350 kHz

• Peak Efficiency: 94.5%, Efficiency > 90% for all

Loads Above 10% of Rated Load

• Excellent Current Sharing Between Phases Without

Any Additional Hardware

• Phase Shedding With Programmable Limits

• Fault Protection: Phase and Output Overcurrent,

Output Overvoltage, and Input Undervoltage and

Overvoltage

• Supported by Various C2000 powerSUITE Tools

Applications

• Server Power Supplies

• Telecom Rectifiers

• Automotive Charging

• Industrial Power Supplies

An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other

important disclaimers and information.

System Overview

www.ti.com

TIDUCT9–January 2017

Submit Documentation Feedback

Two-Phase Interleaved LLC Resonant Converter Design With C2000™

Microcontrollers

1 System Overview

1.1 System Description

Resonant converters are popular DC-DC converters frequently used in server, telecom, automotive,

industrial, and other power supply applications. The converters are a good choice for medium- to high-

power applications because of their adherence to improving industry standards, ever-increasing power-

density goals, and high-performance (efficiency, power density, and so forth) standards,

These are variable-frequency converters where the PWM-switching frequency of operation frequently

changes during runtime. For reliable operation the changing frequencies must not produce any glitches or

irregular PWM behavior. For applications with high-output currents that require input-output isolation, it is a

common practice to use synchronous rectification (SR) on the secondary of the isolation transformer. SR

uses additional power electronic devices switching with changing frequencies. High-power applications

may require use of multiphase interleaved converters. These interleaved converters have even more

devices switching with variable frequencies and additionally require fixed-phase relationships between

various phases under all operating frequencies. Guaranteeing correct PWM waveform generation with

changing frequencies under all operating conditions is a big challenge for the controller. Furthermore,

interleaving multiple phases of resonant converters presents current sharing challenges between phases.

Inadequate or improperly implemented current sharing or incorrect PWM waveform generation can lead to

converter failure, significant system or component damage, and, in the worst case, significant property

damage or resultant bodily injury or loss of life.

In server and telecom power supply applications, these converters are used to work as the isolated DC-

DC converter stage in the rectifier system. These converters provide high efficiency and power density

through soft-switching, SR, and other techniques.

These converters are gaining popularity in automotive on-board charging applications. Additionally, these

devices may be used as isolated, bi-directional converters in electric vehicles (EVs) and hybrid electric

vehicle (HEVs).

This design implements a 500-W, two-phase, interleaved half-bridge (HB) LLC resonant converter with SR

on the secondary. The system is controlled by a single C2000 MCU, TMS320F28379, which also

generates correct PWM waveforms for all power electronic switching devices (MOSFETs) using the latest

features on C2000 MCUs. An innovative current sharing technique is implemented by the C2000 MCU to

accurately achieve current and phase balancing for multiphase interleaved converters.

The accompanying software allows programming the controller and experimenting with different control

parameters to tune the control loop for good system performance. This design supports the use of C2000

powerSUITE tools like the compensation designer, the software frequency response analyzer, and the

solution adapter. The software project allows users to evaluate the complete system with the help of these

supported tools. This document provides the hardware and software design details along with the test

results. This document also describes a structured step-by-step method to evaluate this solution by

starting with a simple open-loop excitation and then working towards a complete well-tuned closed-loop

system.

www.ti.com

System Overview

TIDUCT9–January 2017

Submit Documentation Feedback

Two-Phase Interleaved LLC Resonant Converter Design With C2000™

Microcontrollers

1.2 Key System Specifications

(1)

These default overcurrent limits are programmable and may be adjusted to allow high-load operation under noisy test conditions

or to limit these currents to lower levels.

(2)

Note that the resonant tank inductors are the hottest components on the board. Use an external air cooling fan (CFM rating > 50)

directed at the board when operating with loads (I

out

) of 30 A or higher.

Table 1. TIDM-1001 Performance Specifications

PARAMETER TEST CONDITIONS MINIMUM TYP MAXIMUM UNITS

INPUT CHARACTERISTICS

Voltage range — 370 390 410 V

Input undervoltage

threshold

— — 370 — V

Input overvoltage

threshold

— — 410 — V

Input current Vin = 370 V

, full

load = 42.5 A

— — 1.55 A

Input current Vin = 390 V

, full

load = 42.5 A

— — 1.5 A

Input current Vin = 410 V

, full

load = 42.5 A

— — 1.5 A

Phase overcurrent

threshold

(1)

— — 3.2 — A

OUTPUT CHARACTERISTICS

Output voltage,

out

No load to full load — 12 — V

Output overvoltage

threshold

— — 13.5 — V

Load regulation V

= 410 V

, I

out

=2.5A to 42.5 A

— 50 — mV

Line regulation V

= 370 V

to 410

, I

out

= 10 A

— < 5 — mV

Output load

current, I

out

(2)

= 370 V

to 410

— — 42.5 A

Output over-

current threshold

(1)

— — 55 — A

Output power

(2)

— — — 500 W

Output power per

phase

— — — 250 W

SYSTEM FEATURES

Peak efficiency V

= 390 V

, I

out

10 A

— 94.5% — —

Efficiency V

= 370 V

to 410

, 4.2 A <I

out

42.5 A

— > 90% — —

Full-load efficiency V

= 370 V

, I

out

42.5 A

— 92% — —

Resonant

frequency

— — 250 — kHz

Switching

frequency

— 200 — 350 kHz

+Vout

Vin

UCD7138

RCS

OPA365

-Vout

Ph1HS

Ph1LS

Ph2HS

PH2LS

Ph1SRA

Ph1SRB

Ph2SRA

Ph2SRB

Q10

Lr_PH1

Lr_PH2

Cr_PH2

Cr_PH1

T_PH2

T_PH1

Ipri_PH1

Ipri_PH2

CT_gain

Ipri_PH2

heavily_Filtered

Ipri_PH2_O

C_PROT

Ipri_PH1

heavily_Filtered

Ipri_PH1_O

C_PROT

Iout heavily_Filtered

Iout OC_PROT

OPA_gain

UCC27524

V_gain

System Overview

www.ti.com

TIDUCT9–January 2017

Submit Documentation Feedback

Two-Phase Interleaved LLC Resonant Converter Design With C2000™

Microcontrollers

1.3 Block Diagram

Figure 1. TIDM-1001 System Block Diagram

1.4 Highlighted Products

1.4.1 TMS320F28379

The Delfino™ TMS320F2837xD is a powerful, 32-bit, floating-point MCU designed for advanced closed-

loop control applications, such as industrial drives and servo motor control, solar inverters and converters,

digital power, transportation, and power line communications.

These devices feature integrated performance analog and control peripherals along with various

communication peripherals to enable system consolidation. Four independent 16-bit analog-to-digital

converters (ADCs) provide precise and efficient management of multiple analog signals, which ultimately

boosts system throughput. The comparator subsystem (CMPSS) with windowed comparators allows for

protection of power stages when current limit conditions are exceeded or not met. Other analog and

control peripherals include DACs, PWMs, eCAPs, eQEPs, and other peripherals. Latest features on the

PWM, CMPSS, and ADC peripherals are extensively used in this TI Design.

1.4.2 UCD7138

The UCD7138 device is a high-performance, 4-A and 6-A, single-channel MOSFET driver with body-diode

conduction sensing and reporting. In this design the device is used to achieve advanced SR control

without a need for typically lossy and expensive current sensing circuit. The device contains a high-speed

gate driver, a body-diode conduction-sensing circuit, and a turnon delay optimization circuit. The device is

suitable for high-power, high-efficiency isolated converter applications where SR dead-time optimization is

desired. The benefits of the chipset include maximizing system efficiency by minimizing body-diode

conduction time, robust and fast negative-current protection, and a simple interface.

PWMxA

PWMxB

Load

LLC Resonant

Transformer

OUT

www.ti.com

System Overview

TIDUCT9–January 2017

Submit Documentation Feedback

Two-Phase Interleaved LLC Resonant Converter Design With C2000™

Microcontrollers

The UCD7138 device offers asymmetrical rail-to-rail, 4-A source and 6-A sink peak-current drive

capability. The short propagation delay and fast rise and fall time allows efficient operation at high

frequencies. The UCD7138 device is capable of sensing body-diode conduction time as low as 10 ns.

1.4.3 UCC27524

The UCC2752x family of devices are dual-channel, high-speed, low-side gate-driver devices capable of

effectively driving MOSFET and IGBT power switches. Using a design that inherently minimizes shoot-

through current, UCC2752x can deliver high-peak current pulses of up to 5-A source and 5-A sink into

capacitive loads along with rail-to-rail drive capability and extremely small propagation delay (typically 13

ns). In addition, the drivers feature matched internal propagation delays between the two channels. These

delays are very well suited for applications requiring dual-gate drives with critical timing, such as the high-

side and low-side switches of a HB in this design. This delay also enables connecting two channels in

parallel to effectively increase current-drive capability or driving two switches in parallel with one input

signal. Wide hysteresis between the high and low thresholds offers excellent noise immunity.

1.5 Functional Description

Resonant power converters contain resonant L-C networks whose voltage and current waveforms vary in

a sinusoidal pattern during one or more sub-intervals of each switching period. Figure 2 shows a generic

block diagram of a HB LLC resonant converter system. The resonant tank circuit is formed by external

inductor L

, transformer leakage inductance L

, transformer magnetizing inductance L

, and capacitor C

In some cases it is possible to integrate L

into the transformer design.

Figure 2. Block Diagram of HB LLC Converter

HB switches Q1 and Q2 are driven with 50% (typical) duty cycle signals that are frequency modulated. As

a result the voltage at Q2 drain is a square wave voltage with changing fundamental frequency. The tank

circuit acts as a band-pass filter that filters out the high-frequency and low-frequency components from

this voltage and leaves the dominant fundamental frequency component. This component is then rectified

on the secondary with either diode rectification or SR. A higher tank circuit current at the fundamental

frequency implies higher energy that is transferred to the secondary or load. Frequency modulation of the

PWM signals driving the HB switches consequently changes the tank network impedance resulting in a

higher or lower tank circuit current depending on the fundamental frequency. This allows output voltage to

be regulated by simply modulating the PWM frequency. [1]

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lightining_bug

2020-05-05

代码是TI官网的，没什么用。

qq_31136087

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