POWER CONVERSION APPARATUS AND AIR CONDITIONER INCLUDING THE SAME

• US 20170063248A1
• Filed: 08/29/2016
• Published: 03/02/2017
• Est. Priority Date: 08/27/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Jongwan, Kim, Eungho, Park, Gwigeun
• Granted Patent: US 9,941,807 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F24F 1/20 Electric components for separate outdoor units
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/56 Remote control
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/64 using pre-stored data
• CPC Class Codes: F24F 5/001 Compression cycle type
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2700/151 of the compressor motor
• CPC Class Codes: F25B 31/02 of motor-compressor units
• CPC Class Codes: H02M 1/12 Arrangements for reducing harmonics from ac input or output
• CPC Class Codes: H02M 3/335 using semiconductor devices only
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02P 27/08 with pulse width modulation

Abstract

A power conversion apparatus includes a rectifier to rectify a voltage of an input alternating current (AC) power source and a voltage drop device to output a dropped voltage using the voltage from the rectifier, and the voltage drop device includes a transformer and a communication voltage output device provided at a secondary side of the transformer to output a first direct current (DC) voltage for operation of a communication device. The communication voltage output device includes a first resistor provided at the secondary side of the transformer to reduce an output change rate of the first DC voltage and first and second zener diodes connected between the first resistor and ground to limit an upper limit of the first DC voltage. Accordingly, it is possible to stably supply a voltage to a communication unit while reducing standby power.

Claims

1. A power conversion apparatus comprising:

a rectifier to rectify a voltage of an input alternating current (AC) power source; and

a voltage drop module to output a dropped voltage using the voltage from the rectifier, wherein the voltage drop module includes;

a transformer having a primary side and a secondary side; and

a communication voltage output module provided at the secondary side of the transformer to output a first direct current (DC) voltage to operate a communication module, and wherein the communication voltage output module includes;

a first resistor provided at the secondary side of the transformer to reduce an output change rate of the first DC voltage; and

first and second zener diodes connected between the first resistor and the ground to limit an upper limit of the first DC voltage.

2. The power conversion apparatus according to claim 1, wherein the communication voltage output module further includes second and third resistors provided between the first resistor and the first and second zener diodes and connected in parallel.

3. The power conversion apparatus according to claim 1, wherein the communication voltage output module further includes first and second capacitors connected to the first and second zener diodes in parallel.

4. The power conversion apparatus according to claim 1, further including:

a power disconnection module to perform a power disconnection operation between the input AC power source and the rectifier; and

a capacitor provided between the rectifier and the voltage drop module.

5. The power conversion apparatus according to claim 1, wherein the voltage drop module includes a flyback converter including the transformer and a switching element connected to the primary side of the transformer.

6. The power conversion apparatus according to claim 1, further including:

a capacitor provided between the rectifier and the voltage drop module; and

an inverter connected across the capacitor and connected to the voltage drop module in parallel to drive a motor.

7. The power conversion apparatus according to claim 6, further including:

a dc link voltage detector to detect a voltage across the capacitor;

an output current detector to detect output current flowing between the motor and the inverter; and

an inverter controller to control the inverter based on the output current.

8. An air conditioner comprising:

a compressor;

a compressor driver to drive the compressor;

a communication module to exchange data with an indoor device;

a rectifier to rectify a voltage of an input alternating current (AC) power source; and

a voltage drop module to output a dropped voltage using the voltage from the rectifier, wherein the voltage drop module includes;

a transformer having a primary side and a secondary side; and

a communication voltage output module provided at the secondary side of the transformer to output a first direct current (DC) voltage to operate the communication module, and wherein the communication voltage output module includes;

a first resistor provided at the secondary side of the transformer to reduce an output change rate of the first DC voltage; and

first and second zener diodes connected between the first resistor and the ground to limit an upper limit of the first DC voltage.

9. The air conditioner according to claim 8, wherein the communication voltage output module further includes second and third resistors provided between the first resistor and the first and second zener diodes and connected in parallel.

10. The air conditioner according to claim 8, wherein the communication voltage output module further includes first and second capacitors connected to the first and second zener diodes in parallel.

11. The air conditioner according to claim 8, further including:

a power disconnection module unit to perform a power disconnection operation between the input AC power source and the rectifier; and

a capacitor provided between the rectifier and the voltage drop module.

12. The air conditioner according to claim 8, wherein the voltage drop module includes a flyback converter including the transformer and a switching element connected to the primary side of the transformer.

13. The air conditioner according to claim 8, further including:

a capacitor provided between the rectifier and the voltage drop module; and

an inverter connected across the capacitor and connected to the voltage drop module in parallel to drive a motor.

14. The air conditioner according to claim 13, further including:

a dc link voltage detector to detect a voltage across the capacitor;

an output current detector to detect output current flowing between the motor and the inverter; and

an inverter controller to control the inverter based on the output current.