# US 8,788,102 B2 · Air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,788,102 B2 - Document ID: US8788102B2 - Status: Granted - Kind: B2 - Application number: 13/024,507 - Filed: 2011-02-10 - Published: 2011-08-18 - Granted: 2014-07-22 - Earliest claimed: 2010-02-12 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Seung Kwan Lee - Inventors: Seung Kwan Lee - Web page: https://patentgrep.com/patent/US8788102B2 ## CPC - G08C 19/16: in which transmission is by pulses - F24F 11/30: for purposes related to the operation of the system, e.g. for safety or monitoring - F24F 11/56: Remote control - F24F 11/63: Electronic processing - F24F 11/88: Electrical aspects, e.g. circuits - F24F 11/89: Arrangement or mounting of control or safety devices - G08C: TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmitting systems F15B; mechanical means for transferring the output of a sensing member into a different variable G01D5/00; mechanical control systems G05G) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract An air conditioner includes an indoor unit and a remote controller connected to the indoor unit through two lines to receive power from the indoor unit and perform communication with the indoor unit. The indoor unit includes a first modulation switching element to modulate power according to a communication signal that is transmitted to the remote controller, a first demodulation switching element that is driven according to a communication signal transmitted from the remote controller, and a first distribution resistor to demodulate the communication signal transmitted from the remote controller. The remote controller includes a second modulation switching element to modulate power according to a communication signal that is transmitted to the indoor unit, a second demodulation switching element that is driven according to modulated power transmitted from the indoor unit, and a second distribution resistor to demodulate modulated power transmitted from the indoor unit to obtain a communication signal. ## Claims ### Claim 1 An air conditioner, comprising: an indoor unit; and a remote controller connected to the indoor unit through two lines to receive power from the indoor unit and perform communication with the indoor unit, wherein the indoor unit comprises a first modulation switching element to modulate power through the two lines according to a communication signal that is transmitted to the remote controller, a first demodulation switching element that is driven according to a communication signal transmitted from the remote controller through the two lines, and a first distribution resistance element to demodulate the communication signal transmitted from the remote controller through the two lines, wherein the remote controller comprises a second modulation switching element to modulate power through the two lines according to a communication signal that is transmitted to the indoor unit, a second demodulation switching element that is driven according to a modulated power through the two lines transmitted from the indoor unit, and a second distribution resistance element to demodulate the modulated power transmitted from the indoor unit through the two lines to obtain a communication signal, and wherein the remote controller further comprises a power unit that is charged with the modulated power provided from the indoor unit through the two lines, wherein the indoor unit further comprises a power terminal to supply the power, and a first modulation resistance element connected to the power terminal and the first modulation switching element, the first modulation resistance element reducing a level of power provided from the power terminal when the first modulation switching element is turned off. ### Claim 2 (depends on 1) The air conditioner according to claim 1, wherein the first modulation switching element comprises a transistor and the modulation resistance element is connected between an emitter and a collector of the transistor. ### Claim 3 (depends on 2) The air conditioner according to claim 2, wherein the indoor unit further comprises a first demodulation resistance element to adjust a voltage induced at the first demodulation switching element according to operation of the first modulation switching element. ### Claim 4 (depends on 3) The air conditioner according to claim 3, wherein, when the indoor unit transmits a low signal, the power provided from the power terminal is reduced through the first modulation resistance element and the first demodulation resistance element and the reduced power is provided to the remote controller to turn off the second demodulation switching element to allow the remote controller to receive a low signal. ### Claim 5 (depends on 1) The air conditioner according to claim 1, wherein the indoor unit transmits a high signal when no communication signal is transmitted to the remote controller. ### Claim 6 (depends on 5) The air conditioner according to claim 5, wherein the indoor unit further comprises a first transmitting terminal, a first receiving terminal, and a third modulation switching element connected to the first receiving terminal, wherein the third modulation switching element is driven according to a communication signal transmitted from the first transmitting terminal and provides the communication signal to the first receiving terminal. ### Claim 7 (depends on 6) The air conditioner according to claim 6, wherein, if the second modulation switching element is turned on to maintain a high signal at the first transmitting terminal when a high signal is transmitted to the remote controller, the third demodulation switching element is turned on due to the maintained high signal, and, if the second modulation switching element is turned off to block a high signal at the first transmitting terminal when a low signal is transmitted to the remote controller, the third demodulation switching element is turned off due to the blocked high signal. ### Claim 8 (depends on 1) The air conditioner according to claim 1, wherein the remote controller further comprises a second modulation resistance element connected to the power unit and the second modulation switching element to reduce a level of the power provided from the power unit when the second modulation switching element is turned off. ### Claim 9 (depends on 1) The air conditioner according to claim 1, wherein the second modulation switching element comprises a transistor and the second modulation resistance element is connected between an emitter and a collector of the transistor. ### Claim 10 (depends on 9) The air conditioner according to claim 9, wherein the remote controller further comprises a second demodulation resistance element to adjust a voltage induced at the second demodulation switching element according to operation of the second modulation switching element. ### Claim 11 (depends on 1) The air conditioner according to claim 1, wherein the remote controller further comprises a second transmitting terminal, a second receiving terminal, and a fourth demodulation switching element connected to the second receiving terminal, wherein the fourth demodulation switching element is driven according to a communication signal transmitted from the second transmitting terminal and provides the communication signal to the second receiving terminal. ### Claim 12 An air conditioner, comprising a remote controller, the remote controller comprising: a second demodulation switching element to receive modulated power from an external device and to be driven according to the modulated power; a second distribution resistance element connected to the second demodulation switching element to demodulate the modulated power to obtain a communication signal; and a second modulation switching element to be driven according to a communication signal that is transmitted to the external device; and a power unit to be charged with power supplied from the external device and to provide the power as a drive power, wherein the remote controller further comprises a second modulation resistance element to reduce a level of the power provided from the power unit if the second modulation switching element is turned off when the remote controller transmits a signal to the external device. ### Claim 13 (depends on 12) The air conditioner according to claim 12, wherein the remote controller further comprises a second demodulation resistance element to adjust a voltage induced at the second demodulation switching element according to operation of the second modulation switching element. ### Claim 14 (depends on 13) The air conditioner according to claim 13, wherein, when the second modulation switching element is turned off, power is provided to the second modulation resistance element and the second demodulation resistance element to block power supply from the external device.