IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0877076
(2010-09-07)
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등록번호 |
US-8120312
(2012-02-21)
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발명자
/ 주소 |
- Bucur, Constantin
- Popescu-Stanesti, Vlad Mihail
- Niculae, Marian
- Nees, Daryl
|
출원인 / 주소 |
- 02Micro International Limited
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인용정보 |
피인용 횟수 :
5 인용 특허 :
73 |
초록
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A power supply topology according to one embodiment includes a first path coupled to a controllable DC power source, a second path coupled to a rechargeable battery, and a third path coupled to a system load, the three paths coupled to a common node. The topology may further include a unidirectional
A power supply topology according to one embodiment includes a first path coupled to a controllable DC power source, a second path coupled to a rechargeable battery, and a third path coupled to a system load, the three paths coupled to a common node. The topology may further include a unidirectional switch coupled to the first path and a selectively unidirectional switch coupled to the second path. The topology may further include a power management control circuit including a wake up circuit having a comparison circuit and an output decision circuit. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.
대표청구항
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1. A wake up circuit comprising: a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to a battery and said wake up current signal repre
1. A wake up circuit comprising: a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to a battery and said wake up current signal representative of a wake up current level; andan output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to a switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF. 2. The wake up circuit of claim 1, wherein said comparison output signal comprises an analog signal, said switch responsive to said analog signal to enter an intermediate conduction state to provide a current level to said battery representative of a predetermined wake up current level. 3. The wake up circuit of claim 2, wherein said analog signal comprises a voltage signal, said switch comprising a field effect transistor having a gate terminal receiving said voltage signal. 4. The wake up circuit of claim 1, wherein said output decision circuit is further configured to receive a selector signal from a selector circuit, said selector signal comprises a digital signal, and wherein said switch is in a full conduction state in response to said digital signal in a first state. 5. The wake up circuit of claim 1, wherein said output decision circuit receives at least one additional input signal, said at least one additional input signal being an enabling signal, said output decision circuit responsive to said enabling signal to provide said comparison output signal to said switch if said enabling signal is in a first state. 6. The wake up circuit of claim 1, wherein said output decision circuit receives at least one additional input signal, said at least one additional input signal being a battery voltage signal, said output decision circuit responsive to said battery voltage signal to provide said selector output signal to said switch if said battery voltage signal is representative of a voltage level of said battery greater than a threshold voltage level. 7. The wake up circuit of claim 1, wherein said output decision circuit receives at least one additional input signal, said at least one additional input signal being a maximum wake up charge time signal, said output decision circuit responsive to said maximum wake up charge time signal to provide said selector output signal to said switch if said maximum wake up charge signal is representative of a continuous time of said output decision circuit providing said comparison output signal exceeding a maximum time interval. 8. The wake up circuit of claim 1, wherein said comparison circuit comprises an error amplifier, said error amplifier receiving a first signal representative of said charging current level provided to said battery and a second signal representative of said wake up current level providing said comparison output signal. 9. An apparatus comprising: a switch configured to allow selective coupling of a controllable DC power source to a system load via a common node, said switch also configured to allow selective coupling of a battery to said common node; anda wake up circuit comprising: a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to a battery and said wake up current signal representative of a wake up current level; andan output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to said switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF. 10. The apparatus of claim 9, wherein said comparison output signal comprises an analog signal, said switch responsive to said analog signal to enter an intermediate conduction state to provide a current level to said battery representative of a predetermined wake up current level. 11. The apparatus of claim 10, wherein said analog signal comprises a voltage signal, said switch comprising a field effect transistor having a gate terminal receiving said voltage signal. 12. The apparatus of claim 9, wherein said selector signal comprises a digital signal, and wherein said switch is in a full conduction state in response to said digital signal in a first state. 13. A method comprising: receiving a first signal at a switch, said switch coupled to a battery, said switch responsive to said first signal to enter an intermediate conduction state to provide a current level to said battery representative of a wake up current level; andreceiving a second signal at said switch, said switch responsive to said second signal to enter a full conduction state when said second signal is in a first state. 14. The method of claim 13, wherein said first signal comprises an analog signal. 15. The method of claim 14, wherein said analog signal comprises a voltage signal, said switch comprising a field effect transistor having a gate terminal receiving said voltage signal. 16. The method of claim 13, wherein said second signal comprises a digital signal. 17. An system comprising: a controllable DC power source;a battery;a first switch configured to allow selective coupling of said controllable DC power source to a system load via said common node;a second switch configured to allow selective coupling of said battery to said common node; anda wake up circuit comprising: a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to said battery and said wake up current signal representative of a wake up current level; andan output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to said switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF. 18. The apparatus of claim 17, wherein said comparison output signal comprises an analog signal, said second switch responsive to said analog signal to enter an intermediate conduction state to provide a current level to said battery representative of a predetermined wake up current level. 19. The apparatus of claim 18, wherein said analog signal comprises a voltage signal, said second switch comprising a field effect transistor having a gate terminal receiving said voltage signal. 20. The apparatus of claim 17, wherein said selector signal comprises a digital signal, and wherein said second switch is in a full conduction state in response to said digital signal in a first state.
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