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公开(公告)号：US10075074B2
公开(公告)日：2018-09-11
申请号：US15498236
申请日：2017-04-26
申请人： O2Micro, Inc.
发明人： Gang Li , Fengjiang Zhang , Guoyong Guo
CPC分类号： H02M3/158 , H02M1/00 , H02M1/36 , H02M3/156 , H02M3/1584 , H02M2001/0003 , H02M2003/1566 , H02M2003/1586
摘要： In a controller for a DC to DC converter, PWM signal generating circuitry generates a set of PWM signals phase-shifted relative to one another, and controls states of the PWM signals according to a set of control signals. Each PWM signal of the PWM signals has an on-time state and an off-time state. Ramp signal generating circuitry, coupled to the PWM signal generating circuitry, generates a set of ramp signals having substantially the same ramp slope. Each ramp signal of the ramp signals is generated in response to detecting an on-time state of a corresponding PWM signal of the PWM signals. Additionally, a comparing circuit, coupled to the PWM and ramp signal generating circuitry, alternately compares the ramp signals with a preset reference to generate the control signals. A corresponding control signal of the control signals changes the corresponding PWM signal from the on-time state to an off-time state.
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公开(公告)号：US09742131B2
公开(公告)日：2017-08-22
申请号：US14734964
申请日：2015-06-09
申请人： O2Micro Inc.
发明人： Guoyong Guo , Shiqiang Yang , Zhanpeng Yang
摘要： In a power transfer system, a first main switch can transfer power from a first connector to an output terminal. A first path can deliver a current from the first connector to the output terminal and control the current to be within a predefined ranger. A second main switch can transfer power from a second connector to the output terminal. A second path can deliver a current from the second connector to the output terminal and control the current to be within a predefined range. Control circuitry can turn off the second main switch and the second path and turn on the first path if the first power source is available at the first connector when the second power source is providing power to the output terminal. The control circuitry can turn on the first main switch when a time interval from turning on the first path has elapsed.
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公开(公告)号：US09660473B2
公开(公告)日：2017-05-23
申请号：US14543380
申请日：2014-11-17
申请人： O2Micro Inc
发明人： Gang Li , Guoyong Guo , Laszlo Lipcsei
CPC分类号： H02J7/007 , H02J7/0052 , H02J7/0077 , H02J2007/0059 , H02M3/156
摘要： A DC/DC converter converts an input DC voltage to an output DC voltage and charges a battery. The DC/DC converter includes: a DC/DC controller, operable for generating a driving signal according to a target value for the output voltage and a first detection signal indicative of the output voltage level to control switching circuitry and to adjust the output voltage level; and a battery charging controller, coupled to the DC/DC controller and the battery, that is operable for receiving the first detection signal indicative of the output voltage level and a second detection signal indicative of a battery voltage level, and for generating a loop control signal according to the first detection signal and the second detection signal to adjust the target value for the output voltage, wherein the difference between the first detection signal and the second detection signal indicates the amount of a battery charging current.
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公开(公告)号：US09647556B2
公开(公告)日：2017-05-09
申请号：US14326196
申请日：2014-07-08
申请人： O2Micro, Inc.
发明人： Gang Li , Fengjiang Zhang , Guoyong Guo
CPC分类号： H02M3/158 , H02M1/00 , H02M1/36 , H02M3/156 , H02M3/1584 , H02M2001/0003 , H02M2003/1566 , H02M2003/1586
摘要： In a controller for a DC to DC converter, PWM signal generating circuitry generates a set of PWM signals phase-shifted relative to one another, and controls states of the PWM signals according to a set of control signals. Each PWM signal of the PWM signals has an on-time state and an off-time state. Ramp signal generating circuitry, coupled to the PWM signal generating circuitry, generates a set of ramp signals having substantially the same ramp slope. Each ramp signal of the ramp signals is generated in response to detecting an on-time state of a corresponding PWM signal of the PWM signals. Additionally, a comparing circuit, coupled to the PWM and ramp signal generating circuitry, alternately compares the ramp signals with a preset reference to generate the control signals. A corresponding control signal of the control signals changes the corresponding PWM signal from the on-time state to an off-time state.
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