Non-isolated voltage conversion circuit and method and electronic equipment
A voltage conversion circuit, non-isolation technology, applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problem that the zero-crossing signal cannot be output
Pending Publication Date: 2021-12-24
SHENZHEN KIWI MICROELECTRONICS CO LTD
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Problems solved by technology
[0003] In order to meet the simplicity of design and the co-linear requirements of thyristors, a typical home appliance non-isolated AC-DC voltage conversion system usually adopts a floating structure, that is, the reference ground potential of the IC in the non-isolated AC-DC voltage conversion system is changing. , is not a real power ground, therefore, a non-isolated AC-DC voltage conversion system with a floating ground architecture cannot output a zero-crossing signal whose reference ground is the power ground
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[0053] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.
[0055] It can be understood that the terms "first", "second" and the like used in this application may be...
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The invention relates to a non-isolated voltage conversion circuit and method and electronic equipment. The circuit comprises a non-isolated detection circuit and a control circuit, wherein the grounding end of the non-isolated detection circuit is used for being coupled to the ground, the input end of the non-isolated detection circuit is used for being connected with an alternating-current power supply, and the non-isolated detection circuit is used for generating a zero-cross detection signal according to the alternating-current voltage of the alternating-current power supply, and is also used for generating a first voltage according to the alternating-current voltage; and the input end of the control circuit is connected with the first output end of the non-isolated detection circuit, the output end of the control circuit is used for being connected with a load, and the control circuit generates output voltage according to the first voltage so as to supply power to the load. The grounding end of the non-isolated detection circuit is coupled to the ground, so that the reference ground of the non-isolated detection circuit is the power ground, and the non-isolated detection circuit can generate a zero-cross detection signal with the reference ground as the power ground according to the alternating-current voltage of the alternating-current power supply.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a non-isolated voltage conversion circuit, a conversion method and electronic equipment. Background technique [0002] The voltage of the 220V AC power supply is constantly changing with time. In order to achieve voltage regulation, light regulation, temperature regulation, speed regulation and enhance device reliability in the control circuit, a reference point is needed as a starting point. This starting point is the AC power supply The voltage is 0V instantaneously. Zero-crossing detection is to send a zero-crossing signal to the subsequent control circuit when the AC voltage is 0V, and the receiving end of the zero-crossing signal is generally the main control IC. [0003] In order to meet the simplicity of design and the co-linear requirements of thyristors, a typical home appliance non-isolated AC-DC voltage conversion system usually adopts a floating structure...
Claims
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IPC IPC(8): H02M7/217
CPCH02M7/2176
Inventor 谭瑞锋胡燊刚
Owner SHENZHEN KIWI MICROELECTRONICS CO LTD