Overview
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.
Read more about the cost advantage of our air conditioner reference design.
For additional details, demo requests, and design files please visit the reference design page.
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
- Turnkey solution for Air Conditioner designs like Window A/Cs and the Outdoor Unit of Split A/Cs
- 220V, 1.8 KW input power stage, with Digital Interleaved Boost PFC with an efficiency of greater than 90% across the operating range, 0.991 PF and <5% THD
- Compressor Motor:
- Supports PMSM or IPMSM
- Up to 1.4KW Inverter Stage
- 4 to 20kHz Switching Frequency
- Variable Speed Motor Control
- Sensorless FOC
- Torque Compensation
- Field Weakening
- PLL Estimator
- Maximum Torque per Ampere (MTPA) for IPMSM
- Stall Detection
- Condenser FAN:
- Supports PMSM or IPMSM
- 150W Power Stage
- 20kHz Switching Frequency
- Variable Speed Motor Control
- Sensorless FOC
- Wind Milling
- PLL Estimator
- Maximum Torque per Ampere (MTPA) for IPMSM
- Stall Detection with Recovery
- Field communication support with the Indoor Unit
- Optional support to use an ACIM or a built-in drive BLDC motor for the Condenser Fan
- Four temperature sensor interfaces for measuring: Ambient Air, Inlet Air, Outlet Air and Condenser Temperature
- Solenoid Valves and Electronic Expansion Valve (Stepper Motor) Control interfaces
- Fly-back DC-DC to generate 15-V, 12-V, and 3.3-V power rails
Documentation
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Document Category
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| Sensorless BLDC Control with Back-EMF Filtering Using a Majority Function | Application Notes | Link | Download | |
| Introduction to the Air Conditioner Reference Design | Supporting Collateral | Download | ||
| Air Conditioner Reference Design User Guide | User Guide | Download | ||
| TB3220, Sensorless Field-Oriented Control of PMSM for Appliances | Supporting Collateral | Download | ||
| AN1292 Tuning Guide | Application Notes | Download |
| Tool Details |
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This PIM can be used to evaluate the dsPIC33CKxxxMP50x, and dsPIC33CKxxxMP20x devices.This plug-in module (PIM) features an dsPIC33CK256MP508 80-pin TQFP device. It enables using the OpAmps on the MCLV-2 [DM330021-2], MCHV-2 [DM330023-2], MCHV-3 [DM330023-3] boards and Low Voltage Motor Control Development Bundle [DV330100].
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This plug-in module (PIM) features an dsPIC33CK256MP508 80-pin TQFP device. This PIM can be used to evaluate the dsPIC33CKxxxMP50x, and dsPIC33CKxxxMP20x devices. It enables using the internal OpAmps on the dsPIC with the MCLV-2 [DM330021-2], MCHV-2 [DM330023-2], MCHV-3 [DM330023-3] boards and Low Voltage Motor Control Development Bundle [DV330100].
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The Leadshine (EL5-M0400-1-24) 400W 220VAC Brushless AC Servo Motor is designed for high-torque industrial applications. A 2,500-line incremental encoder is attached for servo positioning. The rated speed is 3,000 RPM and the peak speed is 4,000 RPM. The rated torque is 1.27 Nm and the peak torque is 3.82Nm. It responds quickly and moves quietly and smoothly with high precision for control systems. Cables are included. This motor has been tested with Microchip's high-voltage dsPIC motor control application notes and motorBench(R) Development Suite using MCHV-2 (DM330023-2) and MCHV-3 (DM330023-3).
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The dsPIC33CH128MP508 Motor Control PIM is designed to demonstrate the capabilities of the devices from the dsPIC33CH128MPxxx family of dual core, 16-bit Digital Signal Controllers (DSCs) for single motor control application development, by inserting it in the 100-pin PIM interface header on the dsPICDEMTM MCLV-2 or MCHV-2/MCHV-3 Development Boards and using an external op amp configuration board. This PIM also works with the Low-Voltage Motor Control Bundle. Dual-core debug of the Slave Core is supported with a 5-pin header on the PIM.
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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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TThe Microchip dsPICDEM™ MCHV-3 Development Board aids in the rapid evaluation and development of a wide variety of high-voltage motor control applications. This development board is targeted to control Brushless DC (BLDC) motors, Permanent Magnet Synchronous Motors (PMSM), and AC Induction Motors (ACIM) in both sensored or sensorless operation.
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The Microchip dsPICDEM™ MCHV-2 Development Board aids in the rapid evaluation and development of a wide variety of high-voltage motor control applications. This development board is targeted to control Brushless DC (BLDC) motors, Permanent Magnet Synchronous Motors (PMSM), and AC Induction Motors (ACIM) in both sensored or sensorless operation. For new designs, please consider purchasing the dsPICDEM MCHV-3 Development Board for high-voltage motor control applications.
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