Professor: Chi-Jo Wang Student : Nguyen Thi Hoai Nam DIGITAL SIGNAL PROCESSOR AND ENERGY CONTROL.

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Professor: Chi-Jo Wang Student : Nguyen Thi Hoai Nam DIGITAL SIGNAL PROCESSOR AND ENERGY CONTROL

1. INTRODUCTION 2. HISTORY OF DSP FOR CONTROL APPLICATION 3. DSP FUNCTION REQUIREMENT FOR DIGITAL CONTROL POWER SUPPLY 4. DIFFERENT TYPE OF PROCESSOR FOR DIGITAL CONTROL POWER SUPPLY 5.COMMUNICATION FEATURE CREATES FUTURE DIGITAL CONTROL POWER SUPPLY 6. CONCLUSION

- Now a major social problem of global warming, energy is one of important element in the world. - It's an important element for achieving a low carbon society how to utilize energy efficiently Global warming Flood in Thai lan

-As part of the energy-saving green IT has been proceeding all over the world. -And green ET (Embedded Technology) is also important element. - This green ET can realize a low carbon society to connect energy and information by power supply

To realize green ET, different type of intelligent power supply will be required against legacy power supply. Because, future power supply system needs to control power of total system to communicate each other. Then digitalization of power supply is very important to realize intelligent power supply. Digitalization research of power supply was proceeding before, but could not appear practical products due to performance and cost issues. But now, development of digital control power supply is accelerated due to the appearance of high performance and low cost DSP.

-DSP (Digital Signal Processor) is the processor specified for the digital signal processing. More than 25 years have passed after appearing this product in the world -At first time, this processor was developed for the military application -DSP was applied on various application such as control, voice, audio and image processing

-When control applications such as HDD and motor control were moved from analog to digital, some DSP evolved to high speed control oriented DSP. Now this DSP is attracted attention for energy control processor -Fig I shows the rough MIPS requirement of DSP for each application.MIPS Figure I: MIPS requirement of Control Application

1. DSP for control application After appearing DSP at the beginning of year 1980, first control application using DSP was: motor control DSP was used for high speed AC servo motor control for industry application A/D converter

2. Application for energy control In the energy field, DSP is used for the control of UPS (Uninterruptible Power Supply) and solar inverter Now, it's focused on the digital control power supply application and the future development is expected. A/D converter and PWM (Pulse Width Modulation) are most important modules for energy control. It was difficult to realize high speed switching of the digital control power supply using old one-chip DSP due to not enough performance of A/D converter and PWM. The appearance of DSP can easily realize the digital control power supply with high performance.

1. A/D converter -One of important peripheral for digital control power supply is A/D converter -Digital control power supply needs to sense input voltage, output voltage and output current and control PWM output. -A/D converter uses for sensing function and conversion time will be important to improve system performance. A/D converter module

2. PWM (Pulse Width Modulator) -PWM is also important peripheral for digital control power supply. -Output voltage of digital control power supply will be decided to control switching of power module by PWM output. -High resolution of PWM output can control detailed switching control of power supply Pulse Width Modulator

2. PWM (Pulse Width Modulator) Picture I and II shows output voltage of digital power supply Picture I PWM control using 10ns resolution signal is unstable Picture II PWM control using 160ns resolution signal is stable

There are two types of processor for digital control power supply One is micro controller which has hardwired PID controller. It has not flexible feature like DSP, but this device has capability to change parameter from internal micro controller and can realize digital control power supply like a DC/DC POL (Point of Load) The other is DSP which is all programmable solution. Users can select these products depend on their system requirement. Figure II is dedicated digital control power supply IC named Fusion Power by Texas Instruments. PWM Output Differential Sense Inputs

- With pricing reduction of DSP, energy control products will be changed in future. In the past, energy control system was developed as one system - The benefit to use digital control power supply units which is consisted of power module is short development cycle time and flexibility of system design Parallel connection of Power units (Capacity up) Serial connection of Power units (various products)

Figure III shows class structure of digital control power supply. The control from out side of system was limited when use legacy power supply units. But to use DSP, system can react quickly to identify system condition.

1. Communication to identify condition of system System monitoring is one of function to utilize communication feature, And system can identify condition of power supply quickly 2. Communication to detect failure - Failure detection is also important item, It is difficult to identify failure detection using legacy analog power supply module. - When the value falls below a certain power efficiency, power module sends alert to the system quickly. - Then system can identify failure of power module before breaking module

-At first time, DSP was developed for motor control application and expand to not only motor control but also energy control application. To employ DSP for energy control system like digital control power supply, new energy control system will contribute future Green IT and Green ET society Green technology

-The key points to start employing DSP for power supply are high clock speed, high performance A/D converter and high resolution PWM on DSP. -To use communication function on power supply system, system will be able to identify system condition and detect failure of component. -In the future, DSP will be key device in energy control area.

[1]Yutaka Nishikori"Digital control power supply using high speed DSP and quasi-PID control" INTELEC 2008, P090 [2] Yoshimichi Nakamura, "The Design model is improves reliability of the embedded software" The Institute of Electronics, Information and Communication Engineers Conference, Japan, 2007, BS-6-4 [3]"TMS320F28032/28033/28034/28035 Piccolo Microcontrollers (Rev.A) Data sheet" Texas Instruments Inc..SPRS584 [4]"TMS320x2802x, 2803 Piccolo Analog-toDigital Converter and Comparator Ref. Guidee" Texas Instruments Inc., SPRUGE5a [5]"TMS320x2802x, 2803 Piccolo High-Resolution Pulse-Width Modulator Reference Guide" Texas Instruments Inc., SPRUGE8a [6]"TMS320x2803x, Piccolo Control Law Accelerator Reference Guide" Texas Instruments Inc., SPRUGE6

THANK YOU FOR LISTENING !

MIPS (originally an acronym for Microprocessor without Interlocked Pipeline Stages) is a reduced instruction set computer (RISC) instruction set architecture (ISA) developed by MIPS Technologies (formerly MIPS Computer Systems, Inc.). The early MIPS architectures were 32-bit, and later versions were 64-bit. Multiple revisions of the MIPS instruction set exist, including MIPS I, MIPS II, MIPS III, MIPS IV, MIPS V, MIPS32, and MIPS64. The current revisions are MIPS32 (for 32-bit implementations) and MIPS64 (for 64-bit implementations). MIPS32 and MIPS64 define a control register set as well as the instruction set.