Current sensing apparatus for resonant tank in an LLC resonant converter
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02M-003/335
H02M-001/00
출원번호
US-0074246
(2013-11-07)
등록번호
US-9467054
(2016-10-11)
발명자
/ 주소
Dai, Heping
Liu, Xujun
Ye, Liming
Chen, Daoshen
출원인 / 주소
Futurewei Technologies, Inc.
대리인 / 주소
Slater Matsil, LLP
인용정보
피인용 횟수 :
2인용 특허 :
1
초록▼
An apparatus comprises a magnetic device coupled to an inductor-inductor-capacitor (LLC) resonant converter, an ac current sensing circuit coupled to the magnetic device, an average current sensing circuit coupled to the ac current sensing circuit and a reference voltage source coupled to the averag
An apparatus comprises a magnetic device coupled to an inductor-inductor-capacitor (LLC) resonant converter, an ac current sensing circuit coupled to the magnetic device, an average current sensing circuit coupled to the ac current sensing circuit and a reference voltage source coupled to the average current sensing circuit, wherein the reference voltage source is configured such that a magnitude of an average signal from the average current sensing circuit is greater than a voltage level of the reference voltage source.
대표청구항▼
1. A converter comprising: a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches;a resonant tank coupled to the plurality of power switches, wherein the resonant tank comprises a series resonant inductor and a series resonant capacitor;a trans
1. A converter comprising: a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches;a resonant tank coupled to the plurality of power switches, wherein the resonant tank comprises a series resonant inductor and a series resonant capacitor;a transformer coupled to the resonant tank;an output stage coupled to the transformer; anda current sensing apparatus coupled to the series resonant inductor through a magnetic coupling, wherein the current sensing apparatus is configured to: generate a detected signal proportional to a current flowing through the series resonant inductor; andoutput an average signal of the detected signal. 2. The converter of claim 1, wherein: the magnetic coupling is implemented as a signal transformer, and wherein: a primary side of the signal transformer is the series resonant inductor; anda secondary side of the signal transformer is coupled to the current sensing apparatus. 3. The converter of claim 2, wherein: the current sensing apparatus comprises a reference voltage source, and wherein the reference voltage source is configured so that a magnitude of the average signal is greater than a voltage level of the reference voltage source. 4. The converter of claim 3, wherein: the voltage level of the reference voltage source is about 0.8 V. 5. The converter of claim 3, wherein: the transformer is a center-tapped transformer. 6. The converter of claim 3, wherein the current sensing apparatus comprises: a first resistor having a first terminal coupled to a first side of the secondary side of the signal transformer and a second terminal coupled to a second output of the current sensing apparatus through a second resistor;a first capacitor coupled between the second terminal of the first resistor and a second side of the secondary side of the signal transformer; anda second capacitor coupled to the second side of the secondary side of the signal transformer. 7. The converter of claim 3, wherein the current sensing apparatus comprises: a first resistor having a first terminal coupled to a second side of the secondary side of the signal transformer;a first capacitor coupled between a second terminal of the first resistor and a first terminal of a second capacitor; andthe second capacitor having a second terminal coupled to a first side of the secondary side of the signal transformer. 8. The converter of claim 1, wherein: the converter is an LLC resonant converter. 9. An apparatus comprising: a magnetic device coupled to an inductor-inductor-capacitor (LLC) resonant converter;an ac current sensing circuit coupled to the magnetic device;an average current sensing circuit coupled to the ac current sensing circuit, wherein a detected signal at an output of the average current sensing circuit is proportional to a current flowing through a series resonant inductor of the LLC resonant converter; anda reference voltage source coupled to the average current sensing circuit, wherein the reference voltage source is configured such that a magnitude of an average signal from the average current sensing circuit is greater than a voltage level of the reference voltage source, and wherein the reference voltage source is configured to provide an offset on the average signal. 10. The apparatus of claim 9, wherein: the magnetic device is a signal transformer, wherein a primary side of the signal transformer is a series resonant inductor of the LLC resonant converter. 11. The apparatus of claim 9, wherein: the magnetic device is a signal transformer, wherein a primary side of the signal transformer is a winding of a transformer of the LLC resonant converter. 12. The apparatus of claim 9, wherein: the ac current sensing circuit comprises: a first resistor having a first terminal coupled to a second side of a secondary side of a signal transformer;a first capacitor coupled between a second terminal of the first resistor and a first terminal of a second capacitor; andthe second capacitor having a second terminal coupled to a first side of the secondary side of the signal transformer; andthe average current sensing circuit comprises: a rectifier formed by a first diode; anda resistor-capacitor (RC) filter. 13. The apparatus of claim 12, further comprising: a temperature compensation circuit formed by the first diode and a second diode, wherein the second diode and the first capacitor are connected in parallel. 14. The apparatus of claim 9, wherein: the ac current sensing circuit comprises: a first resistor having a first terminal coupled to a first side of a secondary side of a signal transformer and a second terminal coupled to a resistor-capacitor (RC) filter;a first capacitor coupled between the second terminal of the first resistor and a second side of the secondary side of the signal transformer; anda second capacitor coupled to the second side of the secondary side of the signal transformer; andthe average current sensing circuit comprises: a rectifier formed by a first diode; andthe resistor-capacitor (RC) filter. 15. The apparatus of claim 9, wherein: an output voltage level of the reference voltage source is in a range from about 0.8 V to about 3.3 V. 16. A method comprising: providing a resonant converter, wherein the resonant converter comprises: a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches;a resonant tank coupled to the plurality of power switches, wherein the resonant tank comprises a series resonant inductor and a series resonant capacitor;an isolation device coupled to the resonant tank;an output stage coupled to the isolation device through a rectifier; anda current sensing apparatus;detecting an ac signal proportional to a current flowing through the series resonant inductor;providing a reference voltage source coupled to the current sensing apparatus; andconverting the ac signal into an average current signal, wherein a magnitude of the average current signal is greater than a voltage level of the reference voltage source. 17. The method of claim 16, further comprising: providing a temperature compensation circuit coupled to the current sensing apparatus, wherein the temperature compensation circuit is formed by at least one diode. 18. The method of claim 16, further comprising: coupling the current sensing apparatus to the series resonant inductor through a signal transformer, wherein a primary side of the signal transformer is the series resonant inductor. 19. The method of claim 16, wherein: the isolation device is a power transformer. 20. The method of claim 19, further comprising: coupling the current sensing apparatus to the power transformer through a signal transformer, wherein a primary side of the signal transformer is a winding of the power transformer.
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이 특허에 인용된 특허 (1)
Wilkerson, Donovan E.; Skendzic, Veselin; Kesler, James R, Precision, temperature-compensated, shielded current measurement device.
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