Apparatuses, systems, and methods of variable frequency drive operation and control
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-049/02
F25B-013/00
F25B-031/00
출원번호
US-0849866
(2015-09-10)
등록번호
US-10240839
(2019-03-26)
발명자
/ 주소
Sykora, Benjamin James
West, Nathan Thomas
Mehta, Pavak
출원인 / 주소
Trane International LLC.
대리인 / 주소
Taft Stettinius & Hollister LLP
인용정보
피인용 횟수 :
0인용 특허 :
33
초록▼
An exemplary system includes a compressor, a condenser, an expander, and an evaporator fluidly coupled to form a vapor-compression circuit, and an electric motor configured to drive the compressor. An inverter having a plurality of switching elements is configured to provide an output voltage to the
An exemplary system includes a compressor, a condenser, an expander, and an evaporator fluidly coupled to form a vapor-compression circuit, and an electric motor configured to drive the compressor. An inverter having a plurality of switching elements is configured to provide an output voltage to the electric motor through operation of the switching elements. A waste heat recovery circuit is configured to transfer waste heat from the inverter to a load. A controller is configured provide switching commands to the switching elements of the inverter. The controller is further configured to sense a condition of the system, determine a heat production requirement based at least in part upon the system condition, and to vary the number of switching commands per unit time based at least in part upon the heat production requirement.
대표청구항▼
1. A system comprising: a compressor, an expander, a first heat exchanger, and a second heat exchanger, fluidly coupled to form a vapor-compression circuit containing a first working fluid;an electric motor configured to drive the compressor;an inverter comprising a plurality of switches, the invert
1. A system comprising: a compressor, an expander, a first heat exchanger, and a second heat exchanger, fluidly coupled to form a vapor-compression circuit containing a first working fluid;an electric motor configured to drive the compressor;an inverter comprising a plurality of switches, the inverter configured to provide an output voltage to the electric motor through operation of the switches;a waste heat recovery circuit including a conduit containing a second working fluid, the conduit being in conductive thermal contact with the inverter and in conductive thermal contact with the second heat exchanger; anda controller configured to determine whether increased heat of the inverter is desired in response to a sensed temperature of the system and a heat production criterion, and in response to determining that increased heat is desired, increase heat generated by the inverter by varying the rate of switching commands to the inverter, the increased heat of the inverter being transferred by the second working fluid to the second heat exchanger to heat the first working fluid such that a refrigerant portion of the first working fluid boils. 2. The system of claim 1, wherein the controller is configured to vary the number of switching commands per unit time by changing the switching frequency of a PWM signal. 3. The system of claim 1, wherein the controller is configured to vary the number of switching commands per unit time by changing between a continuous PWM signal and a discontinuous PWM signal. 4. The system of claim 1, wherein the second heat exchanger is configured to provide an oil rich portion of the first working fluid to an oil separator. 5. The system of claim 1, wherein wherein the sensed temperature of the system is received by the controller from a temperature sensor thermally coupled with the second heat exchanger. 6. The system of claim 5, wherein the controller is configured to vary the number of switching commands per unit time by changing the switching frequency of a PWM signal. 7. The system of claim 1, further comprising a reversing mechanism operable to reverse the flow direction of a refrigerant in the vapor-compression circuit. 8. The system of claim 1, further comprising a temperature sensor configured to sense an inverter temperature; and wherein the inverter operation module is further structured to reduce the number of switching commands per unit time in response to the inverter temperature being greater than a reference temperature. 9. The system of claim 1 wherein the second heat exchanger comprises one of an oil separator, and an oil purifier. 10. A method comprising: providing a system comprising a compressor, an expander, a first heat exchanger, and a second heat exchanger, fluidly coupled to form a vapor-compression circuit containing a first working fluid, an electric motor configured to drive the compressor, an inverter comprising a plurality of switches, the inverter configured to provide output voltage to the electric motor through operation of the switches, a waste heat recovery circuit including a conduit containing a second working fluid, the conduit being in thermal contact with the second heat exchanger, and a controller configured to determine whether increased heat of the inverter is desired in response to a sensed temperature of the system and a heat production criterion, and in response to determining that increased heat is desired, increase heat generated by the inverter by varying the rate of switching commands to the inverter, the increased heat of the inverter being transferred by the second working fluid to the second heat exchanger to heat the first working fluid such that a refrigerant portion of the first working fluid boils;operating the controller to determine whether increased heat of the inverter is desired in response to a sensed temperature of the system and a heat production criterion; andin response to determining that increased heat is desired, operating the controller to increase heat generated by the inverter by varying the rate of switching commands to the inverter; andtransferring increased heat of the inverter via the second working fluid to the second heat exchanger effective to heat the first working fluid such that a refrigerant in a portion of the first working fluid boils. 11. The method of claim 10, wherein the act of operating the controller to vary the number of switching commands per unit time comprises operating the controller to change the switching frequency of a PWM signal. 12. The method of claim 10, wherein the second heat exchanger is configured to provide an oil rich portion of the first working fluid to an oil separator. 13. The method of claim 10, wherein the sensed temperature of the system is received by the controller from a temperature sensor thermally coupled with the second heat exchanger. 14. The method of claim 13 wherein the act of operating the controller to vary the number of switching commands per unit time comprises operating the controller to change the switching frequency of a PWM signal. 15. The method of claim 10 wherein the second heat exchanger comprises one of an oil separator, and an oil purifier.
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