Power converter adaptively driven
First Claim
1. A drive circuit for a converter, said converter including an inverter and a synchronous rectifier, said drive circuit comprising:
- a modulation circuit for generating a drive waveform for controlling said inverter and said synchronous rectifier employing a negative feedback loop;
a modification circuit, coupled to said modulation circuit, for sensing an operating condition of said converter and shifting a portion of said drive waveform as a function of said operating condition, said modification circuit thereby creating a variable drive waveform from said drive waveform without employing negative feedback; and
a transmission circuit, coupled to said modification circuit, for applying said variable drive waveform to said converter, thereby allowing a variable nonconcurrent change in state of said inverter and said synchronous rectifier according to said function of said operating condition.
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Accused Products
Abstract
A drive circuit for a converter and a method of driving a converter. The converter includes an inverter and a synchronous rectifier. The drive circuit includes: (1) a modulation circuit for generating a drive waveform for controlling the inverter and the synchronous rectifier employing a negative feedback loop, (2) a modification circuit, coupled to the modulation circuit, for sensing an operating condition of the converter and shifting a portion of the drive waveform as a function of the operating condition, the modification circuit thereby creating a variable drive waveform from the drive waveform without employing negative feedback and (3) a transmission circuit, coupled to the modification circuit, for applying the variable drive waveform to the converter, thereby allowing a variable nonconcurrent change in state of the inverter and the synchronous rectifier according to the function of the operating condition.
119 Citations
26 Claims
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1. A drive circuit for a converter, said converter including an inverter and a synchronous rectifier, said drive circuit comprising:
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a modulation circuit for generating a drive waveform for controlling said inverter and said synchronous rectifier employing a negative feedback loop; a modification circuit, coupled to said modulation circuit, for sensing an operating condition of said converter and shifting a portion of said drive waveform as a function of said operating condition, said modification circuit thereby creating a variable drive waveform from said drive waveform without employing negative feedback; and a transmission circuit, coupled to said modification circuit, for applying said variable drive waveform to said converter, thereby allowing a variable nonconcurrent change in state of said inverter and said synchronous rectifier according to said function of said operating condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of driving a converter, said converter including an inverter and a synchronous rectifier, said method comprising the steps of:
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generating a drive waveform for controlling said inverter and said synchronous rectifier employing a negative feedback loop; sensing an operating condition of said converter and shifting a portion of said drive waveform as a function of said operating condition, thereby creating a variable drive waveform from said drive waveform without employing negative feedback; and applying said variable drive waveform to said converter, thereby allowing a variable nonconcurrent change in state of said inverter and said synchronous rectifier according to said function of said operating condition. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A drive circuit for an isolated, buck-derived converter, said converter including an inverter, a synchronous rectifier and an isolation transformer coupled between said inverter and said synchronous rectifier, said drive circuit comprising:
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a modulation circuit for generating a drive waveform for controlling said inverter and said synchronous rectifier employing a negative feedback loop; a modification circuit, coupled to said modulation circuit, for sensing an output current level of said converter and delaying a portion of said drive waveform as a function of said output current level, said waveform modification circuit thereby creating a fixed and a variable drive waveform from said drive waveform without employing negative feedback; and a first and second transmission circuit, coupled to said modification circuit, for applying said fixed drive waveform to said inverter and said variable drive waveform to said synchronous rectifier, thereby allowing a variable change of state of said synchronous rectifier to lag a change of state of said inverter according to said function of said output current level. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification