PFC Power Factor Controller | Mitsubishi Electronics MS-AWA, MU-AWA

Function of main parts

SYMBOL	NAME	FUNCTION
IPM	INTELLIGENT POWER MODULE	It supplies three-phase AC power to compressor.

CB1~3	SMOOTHING CAPACITOR	It stabilizes the DC voltage.
CT1~2	CURRENT TRANSFORMER	It measures the current of the compressor motor.
CT61	CURRENT TRANSFORMER	It measures the current of the main power supply circuit.

L	REACTOR	It rectifies AC, controls its voltage and improves the power factor of
PFC	POWER FACTOR CONTROLLER	power supply.

R64A, R64B	CURRENT-LIMITING RESISTOR	It restricts rush current with the resistance.
X64	RELAY	It short-circuits the resistance which restricts rush current during the
X64	RELAY	compressor operates.
		compressor operates.

2-7-2-2. Outline of main power supply circuit

1.At the start of operation

Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup.

To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B (Current-limiting resistor) are placed in sub circuit.

2.At normal operation

1 When AC runs into noise filter P.C. board, its external noise is eliminated in the noise filter circuit.

2 After noise being eliminated from AC, it is rectified to DC by L (Reactor) and PFC (Power factor controller). If the operating frequency becomes 25Hz or more, DC voltage rises to 370V.

3 DC voltage, to which has AC been rectified by process 2, is stabilized by CB1~3 (Smoothing capacitor) and supplied to IPM (Intelligent power module).

4 The DC (Bus voltage), which has been stabilized in process 3, is converted to three-phase AC by IPM and supplied to compressor.

5 CT1 and CT2 (Current Transformer), which are placed in the power supply circuit to compressor, are used to measure the value of phase current and locate the polar direction of rotor with algorithm. PWM (Pulse width modulation) controls impre- ssed voltage and frequency with those information.

3.Power factor improvement

Booster coil L (Reactor) and PFC rectify AC to DC and control its voltage.

In the motor drive system of sine wave control, power factor can be improved by reducing harmonics PFC and L (Reactor) stabilize the voltage of DC supplied to inverter circuit and make its waveform smooth.

4.Power transistor module

IPM consists of the following components.

·Power Transistors (x6): Converts DC waveform to three-phase AC waveform and outputs it.

· Drive Circuit	: Drives transistors.
· Protection circuit	: Protects transistors from over current.

Since the above components are all integrated in IPM, IPM has a merit that can get the control circuit simplified and mini- aturized.

5. Smoothing capacitor

CB1, CB2 and CB3 stabilize the DC voltage and supply it to IPM.

6. Elimination of electrical noise

Noise filter circuit, which is formed by *CMC COILS and capacitors placed on the noise filter P.C. board, eliminates electrical noise of AC power that is supplied to main power supply circuit. In short, common mode noise is absorbed in this circuit. Moreover, normal mode noise is absorbed in another noise filter circuit which is formed by *NMC COILS and capacitors. Both noise filter circuit exists for preventing the electrical noise generated in the inverter circuit from leaking out.

*CMC COILS; Common mode choke coils *NMC COILS; Normal mode choke coils

MUY-ANA, MSY-ANA, MS-AWA, MUZ-ANA, MXZ-ANA specifications

Mitsubishi Electronics has long been a leader in the HVAC (heating, ventilation, and air conditioning) industry, consistently delivering cutting-edge technology and innovative solutions. The MUZ-ANA, MUZ-ANA - U, MU-AWA, MUZ-FDNA, and MS-AWA models exemplify the company's commitment to efficiency, comfort, and advanced engineering.

The MUZ-ANA series is designed for residential and light commercial applications, offering powerful cooling and heating performance. One of the key features is its inverter technology, which allows for variable-speed operation. This means that the system can adjust the compressor speed according to the temperature demands, leading to significant energy savings and consistent comfort levels throughout the space. Additionally, the MUZ-ANA series operates quietly, ensuring a pleasant indoor environment.

The MUZ-ANA - U model takes energy efficiency a step further by incorporating a top-tier seasonal energy efficiency ratio (SEER) and heating seasonal performance factor (HSPF). This model is designed to maximize comfort while minimizing energy consumption, making it ideal for eco-conscious consumers.

The MU-AWA series is specifically tailored for larger spaces, making it suitable for commercial settings. Its robust design ensures reliability even under the most demanding conditions. Key features include advanced filtration systems that improve indoor air quality by trapping particulates and allergens, preferred by businesses aiming for a healthier environment.

The MUZ-FDNA model stands out for its sleek, compact design that fits seamlessly into various installation contexts, making it flexible for diverse architectural styles. It also features a built-in drain pan that helps in moisture removal, preventing mold growth and enhancing system longevity.

The MS-AWA model is particularly noteworthy for its smart connectivity options, allowing users to control their HVAC system via mobile devices. This feature empowers users to monitor and adjust temperatures remotely, providing added convenience and efficiency.

In summary, the Mitsubishi Electronics MUZ-ANA, MUZ-ANA - U, MU-AWA, MUZ-FDNA, and MS-AWA models feature state-of-the-art technology geared towards maximizing efficiency, comfort, and reliability. From inverter technology to smart connectivity, these units are designed to meet modern consumer demands while emphasizing sustainability and performance. With Mitsubishi Electronics, you can be assured of exceptional quality and technological advancement in HVAC solutions.