Reference Designs and Demos

The 15W Wireless Power Transmitter board, based on the dsPIC® Microcontroller, is compatible with Qi medium power receivers. The development board enables a system efficiency of about 80% at full load and includes status LEDs and LEDs for power level indication.

Microchip’s dsPIC® Digital Signal Controllers (DSCs) offer a strong feature set for wireless power/charging applications in multiple market segments. The devices include a powerful CPU core, multiple PWM generators and advanced analog modules, allowing the customization of solutions. The multiple PWMs allow the control of the full bridge inverter and a front end Buck-Boost converter (required for fixed frequency topologies). In applications where the final solution requires the implementation of a proprietary protocol in addition to the standard, the dsPIC® DSC is ideal because of its computation capability. The CAN/LIN feature in the dsPIC® DSC makes it a good fit for automotive in-car wireless charging. The software structure can be setup efficiently for wireless charging such that basic kernel functions are packaged in library form and add-on/customized functions (such as foreign object detection, CAN, I2C etc.) are provided as API interfaces.

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The 200W Wireless Power reference design is developed by Microchip design partner Fu Da Tong. The transmitter is based on the dsPIC® device and the receiver is based on the PIC16F® device. The reference design implements a proprietary protocol developed from 27 granted U.S patents in Communication, Power Control, and Foreign Object Detection. The 200W solution is ideal for applications such as Power Tools, Vacuum Robots, Industrial Slip Rings, Small Electric Vehicles and Drones.

The Transmitter is powered from a 24V rail and the receiver regulates the output voltage to 24V. The system operates at 90% efficiency at 100W power and a Z-distance of 5-10mm.



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Microchip’s 750W AC-DC Reference Design demonstrates a semi-bridgeless PFC topology followed by a peak current controlled zero-voltage switching full-bridge (ZVS FB) converter with digital slope compensation to achieve very high conversion efficiencies. This power supply can be firmware updated (including the compensator algorithm) with zero down time to the system it is powering while the power supply is running. It is implemented using two dsPIC33EP “GS” digital-power DSCs that provide full digital control of the power conversion as well as all system management functions.

The ZVS FB Converter is designed to stepdown an input DC voltage of 400V to an output DC voltage of 12V. A unique feature of the reference design is the implementation of peak current control, using a fully software-based slope compensation algorithm, which eliminates the use of external analog components for slope compensation. The 750W AC/DC Reference Design is royalty free when used in accordance with the licensing agreement.

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Air conditioner (A/C) designs need to meet stringent energy efficiency ratings and power factor specifications to reduce overall power consumption. High energy efficiency is achieved by using an inverter-based variable speed drive for the brushless motor-based compressor and condenser fans. The variable speed drive and the sensorless field-oriented control (FOC) of brushless motors allow an appliance to operate at an optimal power setting compared to a fixed speed single phase AC induction motor (ACIM) drive. Power factor correction (PFC) is required for all high-power appliances to connect to the electrical grid.

Microchip’s Air Conditioner reference design, based on the dual core dsPIC33CH family of digital signal controllers, demonstrates efficient control of the condenser fan, compressor, PFC and the overall application logic implementation. The high-performance dsPIC33C DSCs (Dual core dsPIC33CH DSCs and Single core dsPIC33CK DSCs) offer the right set of peripherals that is ideal for dual motor control and enables replacing three controllers with one for a cost advantage in your design.

This reference design has proven power stages for high power PFC (220V, 1.8 KW), condenser fan (120 W) and compressor (1.34 KW) motor control. Additional features like temperature sensor interfaces, field communications and valve drives will enable you to develop on this platform for a wide variety of air conditioner systems like window A/Cs and the outdoor unit of split A/Cs.

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Benefits

• Single chip solution to optimize cost 

• Simplifies the development by enabling independent code development for the PFC and Dual motor control using the dual core dsPIC33CH DSCs 
  • Slave core implements dedicated time-critical dual motor control algorithms  
  • Master core implements Interleaved Boost PFC, system functions and other custom features 
• 3-phase motor control power stage for driving Low Power High Voltage BLDC/ PMSM motors

The ASC-70 compact isolation transformer is our first generation of small desktop transformers with a power rating of 70 VA max. It offers safety isolated short circuit proof AC voltage, current and power ratings for a multitude of applications for daily use in laboratories, schools or workshops. The model supports US and EU input voltage range by providing 12 VAC and 24 VAC unregulated voltage at the output.

Can be used along with Low Voltage PFC Development Board to provide and isolated short circuit proof voltage (12VAC / 24VAC)

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The BLDC motors are being used extensively for both consumer and industrial applications due to its compact size, controllability, high efficiency and low maintenance cost. With the advancements in microcontrollers (MCUs), the motor control industry is focusing on designing MCU based low-cost motor control solutions for various applications.

If low cost is one of the primary concerns, then Microchip's PIC32MM family of Low Power, Low Cost, 32-bit MCUs address the motor control requirements. The PIC32MM devices include Core Independent Peripherals (CIPs), designed to offload the CPU, such as Comparators and Multiple/Single-output Capture Compare PWM (MCCPs/SCCPs). These CIPs enable implementing “Sensorless Trapezoidal BLDC Motor Control with Back-EMF Filtering Using Majority Function” which requires minimal external hardware, thus optimizing the overall BoM.

What makes the Solution Cost effective?
Low Cost of 32-bit PIC32MM MCUs
Integrated CIPs on PIC32MM offer higher integration reducing external components requirement
Characteristics of the Solution:
Tracking trapezoidal BEMF signals to detect the zero-crossing points
PWM ON-side ADC sampling to reduce noise and solve low-inductance problems
Filtering the signals using majority function
Commutate the motor driving voltages in:
Open / Closed-Loop / Proportional-Integral (PI) Controller
Suitable for use on a wide range of motors (both Y and delta-connected 3-phase motors)
Requires no detailed knowledge of motor parameters and relatively insensitive to tolerance variations

32-bit PIC32MM Sensorless BLDC Motor Control Demo
For a quick evaluation and development, the solution is implemented on a demo kit comprising dsPICDEM™ MCLV-2 Development Board and PIC32MM0064GPL036 Motor Control Plug-in-Module (PIM). The MCLV-2 Board is targeted to control a BLDC motor in sensor or sensorless mode. This flexible and cost effective kit can be configured in different ways for use with Microchip’s specialized PIC32MM0064GPL036 Motor Control PIM.

For high voltage application, the solution works seamlessly on dsPICDEM™ MCHV-2 Development Board with PIC32MM0064GPL036 Motor Control PIM.

For further details on the 32-bit PIC32MM Sensorless BLDC Motor Control solution and the demo kit, contact us @ PIC32MM-Motor-Control@microchip.com or get in touch your regional Microchip Client Engagement Manager.

Need advanced Motor Control Solutions? Visit Microchip’s Motor Control Design Center

High performance power supplies are used in a wide variety of applications ranging from telecommunication equipment, industrial equipment, digital televisions, lighting, air conditioners and other home appliances. They all need solutions for power factor correction to improve overall efficiency, improve the input power factor, voltage regulation and Total Harmonic Distortion (THD) of the input current. Digital interleaved power factor correction methods provide many benefits over older PFC techniques including:

-Lower Cost for High Power Applications
-Smaller PFC Inductor and Magnetic volume
-Higher Power Density
-Lower Ripple
-Easy implementation of sophisticated control algorithms
-Flexible software modifications to meet specific customer needs
-Simpler integration with other applications

This reference design provides an easy method to evaluate the power, and features of SMPS dsPIC® Digital Signal Controllers for an Interleaved Power Factor Correction application. The Interleaved PFC reference design unit works with universal input voltage range, and produces a single high voltage DC output up to 350W of power. The reference design has six main blocks:

-Input EMI filter and rectifier
-Dual Phase Interleaved PFC Circuit with feedback
-Plug in module connector with a dsPIC33FJ16GS504
-User’s interface circuit with programming connector and push buttons
-12V and 3.3V power supply circuit, and
-Fault detection circuit for hardware protection

The dual phase interleaved PFC software implements three compensators for voltage, current and load balancing. It also has a feed-forward compensator based on input average voltage.

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This reference design provides an easy method to evaluate the power, and features of SMPS dsPIC® Digital Signal Controllers for high wattage AC - DC conversion application. Discover the many benefits of digital power control implementation in this reference design. The SMPS AC - DC Reference Design unit works with universal input voltage range, and produces multiple DC outputs. The design is based on a modular structure, which features three major power stages; the input stage, intermediate stage and the third stage, a Point of Load. The input stage is a PFC Boost Converter, the intermediate stage is a Phase-Shifted Zero Voltage Transition (ZVT) Converter, which includes ZVT Full Bridge Converter and Synchronous Rectification, and the third stage is Single-phase and Multi-phase Buck Converters. This reference design uses two dsPIC33F16GS504 devices; one used for the PFC Boost Converter and ZVT Full Bridge Converter, while the other dsPIC® DSC is used for Single-phase and Multi-phase Buck Converters.

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Even though most high voltage (110Vac/220Vac) 3-phase motor control applications are high power (>1kW) there are many applications that are low power (<500W). In those cases running on a high power system is not very efficient.  To better demonstrate the capabilities in regards to efficiency in low power high voltage motor control we have developed this reference design (limited to 150W).
This compact and cost-effective high voltage board is targeted to control various high voltage motors such as Brushless DC (BLDC) motors, Permanent Magnet Synchronous Motors (PMSM) and AC Induction Motors (ACIM) in sensored or sensorless operation.

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With the common use of cards instead of cash, Credit Card Reader (MSR, mag stripe/swipe readers) are an essential part of any POS system. MSRs can read any card with magnetic stripes, including some driver's licenses, gift cards, and other IDs.

Magnetic Card Readers (also known as Magnetic Stripe Readers or MSRs) read data from a 3-track magnetic stripe via a peak detection circuit and process that data for downstream users. After extracting data from the magnetic stripe, it is converted to binary data and formatted for encryption. They feed the swiped information to applications management software and connect through USB, RS-232, or PS/2 connections.

Microchip Magnetic card reader solution reads ISO/IEC-7811 cards (also known as “Frequency/double Frequency” (F2F) encoding standard). The data format encodes 7-bit data on Track1, 5-bit data for Track 2 and 3. Please refer to the features section for an in depth description of the Magnetic card readers capabilities.

Microchip offers 2 solutions, one using the dsPIC33EP family and the other using the PIC24F family of PIC's

This demo is not for sale, but can be easily created from components listed in the user's guide.

For questions related to this board please contact http://www.microchip.com/support

The Three Coil Wireless Power Transmitter is based on the dsPIC33CH128MP506 device and implements a fixed frequency power control topology. The front-end buck-boost control is managed by the dsPIC33CH device. The transmitter includes CAN for ease of integration into the automotive environment. The transmitter also enables the implementation of NFC.

Microchip’s dual-core dsPIC33CH devices integrates the wireless power software stack along with CAN-FD software, Front-end Buck- Boost control, NFC software stack, and Crypto Authentication software. The software is partitioned between the two cores such that the wireless power control is implemented independently on one core and all the remaining functions are implemented in the other core. This partitioning facilitates independent code development on separate modules and enables parallel execution of the Qi protocol and other functions such as NFC

Microchip’s 200W DC/DC LLC Resonant Converter Reference Design – EP operates over a wide input voltage range (350 - 420Vdc) with a nominal input of 400V, providing a 12V DC output, while maintaining high-voltage isolation between the primary and secondary. High efficiency is achieved through Zero Voltage Switching (ZVS) on the half-bridge converter and Zero Current Switching (ZCS) on the synchronous rectifier. A synchronous rectifier is implemented over the traditional full wave rectifier for improved efficiency. The DC/DC LLC Resonant Converter Reference Design – EP utilizes Microchip’s digital power conversion dsPIC for unique “adaptive” control of the half-bridge converter and synchronous rectifier.

This reference design is implemented using a single dsPIC33E “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the efficient use of dsPIC33E ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching techniques such as LLC that lower switching losses and enable efficiencies as high as 95%. The DC/DC LLC Resonant Converter Reference Design – EP is royalty free when used in accordance with the licensing agreement.

Microchip’s 200W DC/DC LLC Resonant Converter Reference Design operates over a wide input voltage range (350 - 420Vdc) with a nominal input of 400V, providing a 12V DC output, while maintaining high-voltage isolation between the primary and secondary. High efficiency is achieved through Zero Voltage Switching (ZVS) on the half-bridge converter and Zero Current Switching (ZCS) on the synchronous rectifier. A synchronous rectifier is implemented over the traditional full wave rectifier for improved efficiency. The DC-DC LLC Resonant Converter Reference Design utilizes Microchip’s digital power conversion dsPIC for unique “adaptive” control of the half-bridge converter and synchronous rectifier.

This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching techniques such as LLC that lower switching losses and enable efficiencies as high as 95%. The DC to DC LLC Converter Reference Design is royalty free when used in accordance with the licensing agreement.

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Microchip’s Digital Pure Sine Wave Uninterruptible Power Supply (UPS) Reference Design is based on the dsPIC33F “GS” series of digital-power Digital Signal Controllers (DSCs). This reference design demonstrates how digital-power techniques when applied to UPS applications enable easy modifications through software, the use of smaller magnetics, intelligent battery charging, higher efficiency, compact designs, reduction in audible and electrical noise via a purer sine-wave output, USB communication and low-cost overall bill-of-materials. This reference design is Royalty Free. Click here for a list of complete documentation and software & hardware design information.

This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching techniques such as LLC that lower switching losses and enable efficiencies as high as 95%. The DC to DC LLC Converter Reference Design is royalty free when used in accordance with the licensing agreement.

The Digital Pure Sine Wave UPS System operates in two modes:

Standby Mode – Operational in the presence of AC line voltage; battery is charged in this mode.
UPS Mode – Operational during power outage; the system switches to a function called inverter to provide power to load. Charge stored in the battery is converted to AC output.

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Microchip’s Grid-Connected Solar Microinverter Reference Design demonstrates the flexibility and power of SMPS dsPIC® Digital Signal Controllers in Grid-Connected Solar Microinverter systems. This reference design has a maximum output power of 215 Watts and ensures maximum power point tracking for PV panel voltages between 20V to 45V DC. High efficiency was achieved by implementing a novel interleaved active-clamp flyback topology with Zero Voltage Switching (ZVS).

This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion as well as all system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively develop products using advanced switching techniques / topologies that lower switching losses and improve overall system efficiency. The Grid-Connected Solar Microinverter Reference Design is royalty free when used in accordance with the licensing agreement.

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Bluetooth® has emerged as a standard of choice for connecting local embedded applications through a smartphone or tablet. Many applications only need simple command and control, or a quick status update from a sensor. By catering to these needs, Bluetooth Low Energy (BLE) has evolved to support these low-duty cycle applications with lower power consumption. Microchip’s eXtreme Low Power PIC® Microcontrollers and RN4020 Bluetooth low energy module help in achieving low power consumption. The PIC24FJ128GB204 or PIC24FJ256GB410 devices used in this demo have an integrated hardware Crypto engine. This demonstration shows the simple communication between the RN4020 module and a Bluetooth Low Energy (BLE) supporting smartphone or tablet. The RN4020 module is controlled by the PIC24FJ128GB204 or PIC24FJ256GB410 MCU which include a hardware crypto engine used for AES encryption in the demonstration. The demo is built using standard development tools from Microchip including the Explorer 16 Board, PIC24FJ128GB204 or PIC24FJ256GB410 Processor Plug-In Module (PIM), and Bluetooth LE PICtail Plus Daughter Card. These readily available tools can be used to easily replicate this demo on your own. The demo is supported by MCU firmware and an app that will run on an Android phone or tablet.  The first application is turning the LEDs on and off using the touch buttons on the tablet.  The app can also show the state of the switches on the board, toggling on and off.  The demo also includes data security using the crypto engine integrated on the PIC24FJ128GB204 or PIC24FJ256GB410 MCU, with up to 128-bit AES.   This demo shows a PIC24 XLP MCU working with Bluetooth LE talking to an Android tablet to show basic command and control similar to what would be used for a simple IoT sensor node. This demo can also be built using the PIC24FJ256GB410 Processor Plug-In Module in place of the PIC24FJ128GB204 Processor Plug-in Module. 

For questions related to this board please contact http://www.microchip.com/support

Today, LED lighting meets the need for energy-efficient lighting solutions and is well poised for a varied number of general purpose and industrial applications such as consumer lighting, solar powered lighting and more. The LED Flashlight Board is based on Microchip’s eXtreme Low Power (XLP) and the cost-effective PIC32MM “GPL” family of microcontrollers. For applications demanding low power, longer battery life and small form factor, the PIC32MM devices offer sleep modes down to 500 nA and packages as small as 4×4 mm. This family features Core Independent Peripherals (CIPs) such as Comparators and Multiple-output Capture Compare PWMs (MCCPs) which help enable power conversion and motor control applications.

 

The LED Flashlight board demonstrates the powerful PIC32MM0064GPL028 XLP microcontroller featuring up to 64 KB ECC flash and 8 KB of RAM and is ideally suited to implement an entry level digital power application. The layout and external connections of the LED Flashlight demo board offer unparalleled access to the CIPs such as Comparators and MCCP that are designed to offload the CPU to be in power saving mode, thereby enabling longer battery life. These CIPs enable the user to integrate various system functions onto a single MCU, simplifying the design and keeping system power consumption low. Owing to a higher flash size up to 64 KB, a communication stack can be easily implemented. In this demo, flash size of 32 KB is used to implement the motion sensor calibration stack, leaving additional room to implement other functions.

Demonstration Overview

This demonstration utilizes the 28-pin XLP PIC32MM0064GPL028 MCU to enable all required functions necessary to create closed-loop boost converter to drive a string of three LEDs with minimal intervention from the CPU. The demo highlights a cost-effective and flexible platform for creating variations in LED lighting that is suitable for power conversion and other general purpose applications. Different modes of operation showcase various capabilities of the MCU like high performance 32-bit MIPS microAptiv™ core and integrated analog peripherals that aid in implementing a PI control loop and SPI for integrating a motion sensor. This motion sensor is used to detect a shake to switch between the modes: 

• Mode 0: OFF, PIC32MM will be in RAM retention sleep mode
• Mode 1: ON, Full brightness of LED
• Mode 2: Fade, 50% brightness of LED
• Mode 3: SOS, Blink LED String

Microchip’s Platinum-Rated 720W AC-DC Reference Design demonstrates the flexibility and power of SMPS dsPIC® Digital Signal Controllers in switch-mode power supplies. This reference design has a peak efficiency of 94.1% and achieves the ENERGY STAR CSCI Platinum Level. It features a 2-phase interleaved power factor correction boost converter followed by a 2-phase interleaved two-switch forward converter with synchronous rectification. 

This reference design is implemented using two dsPIC33F “GS” digital-power DSCs from Microchip that provide the full digital control of the power conversion as well as all system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively develop products using advanced adaptive control algorithms that help improve efficiency at light loads. The Platinum-Rated 720W AC/DC Reference Design is royalty free when used in accordance with the licensing agreement.

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The environmental changes of today are no exception. Professional weather stations are rightfully used, but cannot be placed in every corner of the world. What if it was possible to make a low cost weather station, which almost everyone could afford? What if we together could help out with a piece of the puzzle, trying to solve problems ahead?

We have created a portable weather station that will measure and display weather parameters such as 
    •  Temperature 
    •  Humidity 
    •  Environment Air Quality 
    •  Light Brightness
and can be used in office environment and outdoor as well. The design uses Microchip eXtreme Low Power MCU PIC24FJ128GC010 which drives the measurement for all of the sensors. The sensor values undergo signal conditioning using microcontrollers integrated Op-Amps and analog to digital converters making the sensor reading suitable for digital processing. To allow user to control the board and select different operating modes capacitive buttons are implemented using CTMU peripheral. A segmented LCD display and USB are both output for the board. The board is powered by two AA batteries and also a coin cell connected to Vbat pin of the microcontroller for maintaining real time clock information even if the main battery is removed.
 
Besides displaying weather data on board, we can do meaningful use of data by sending data to cloud using computers. This demo also includes connectivity to computers using USB communications device class (or USB CDC), providing an interface for transmitting and receiving to other USB based systems. The demo is supported by Schematic, User guide and MCU firmware.

This level of integration is available on Microchip’s PIC24F ‘GC’ family, we call it intelligent analog and it improves system throughput, reduces noise, and reduces system cost by integrating several analog blocks. We also integrated user interface peripherals like USB, LCD to create a product that is perfect for portable medical and industrial sensors applications.

For questions related to this board please contact http://www.microchip.com/support

This reference design provides an easy method to evaluate the power, and features of SMPS dsPIC® Digital Signal Controllers in high density quarter brick DC-DC converters for intermediate bus architectures(IBA). This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching techniques such as Phase Shift Full Bridge (PSFB) topology that lower switching losses and enable efficiencies as high as 94%. The reference design also supports the Full Bridge topology through minor hardware modifications. The Quarter brick DC to DC Converter Reference Design is royalty free when used in accordance with the licensing agreement.

This reference design works with telecom input range 36V – 76V DC and provides 12V with 200W power. Designed with planar magnetics, this reference design implements various non-linear techniques, which improves the performance and efficiency.

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