A bridgeless pfc current sampling circuit
A sampling circuit and current-type technology, which is applied in the direction of measuring current/voltage, only measuring current, and high-efficiency power electronic conversion, etc., can solve the problems of poor sampling effect and asymmetric sampling signal current, so as to avoid asymmetry and improve The effect of precision
Active Publication Date: 2019-03-01
深圳茂硕电子科技有限公司
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Problems solved by technology
In the existing bridgeless PFC current-type sampling circuit, most of them use three current transformers to sample the system current, superimpose and then process it. In this way, the sampling signal obtained by sampling will have problems such as current asymmetry, and the sampling effect is not very good. it is good
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[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0028] The terms "first", "second" and "third" in the specification and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the term "comprise", as well as any variations thereof, is intended to cover a non-exclusive inclusion. For ...
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The embodiments of the invention provide a bridge-free PFC current type sampling circuit. The sampling circuit includes a major loop module, a rectification module and a difference feedback module. The rectification module is in separate and electrical connection to the major loop module and the difference feedback module. According to the invention, the sampling circuit uses a Hall detection element in the major loop module to detect a system circuit, then uses the rectification module to conduct current rectification, and finally uses the difference feedback module to conduct sampling and difference amplification on the current, and obtains object sampling information which is intended for driving a control unit of the bridge-free PFC to work. The sampling circuit has simple design, high sampling precision, and avoids asymmetry of the sampling current.
Description
technical field [0001] The invention relates to the field of electronic circuit technology, in particular to a bridgeless PFC current type sampling circuit. Background technique [0002] At present, the bridgeless PFC (Power Factor Correction, PFC) is mainly a topology circuit generated for improving the working efficiency of the circuit, and the current sampling design is a relatively important circuit link in the topology circuit. In the existing bridgeless PFC current-type sampling circuit, most of them use three current transformers to sample the system current, superimpose and then process it. In this way, the sampling signal obtained by sampling will have problems such as current asymmetry, and the sampling effect is not very good. it is good. Therefore, a current sampling circuit with better adoption effect and higher sampling accuracy is needed. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to...
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IPC IPC(8): G01R19/00H02M1/42
CPCG01R19/0092H02M1/4233Y02B70/10
Inventor 郝建强王华轶程中原邓勇陈浩
Owner 深圳茂硕电子科技有限公司