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An AC switch circuit and its control method

An AC switch and switch technology, applied in the direction of electronic switch, AC power input conversion to AC power output, electrical components, etc., can solve the problems such as the inability to meet the development needs of intelligent home automation technology, the large size and inconstancy of mechanical relays, etc.

Active Publication Date: 2019-03-05
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the size of the mechanical relay is too large, and the service life is short and not constant, which can no longer meet the development needs of smart home automation technology

Method used

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  • An AC switch circuit and its control method
  • An AC switch circuit and its control method
  • An AC switch circuit and its control method

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only used for illustration, and are not intended to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0022] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of ...

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Abstract

An AC switch circuit coupled between an AC input signal and an AC load has a first switch, a second switch, a driving circuit, and a power generation circuit. The first switch blocks a first half-cycle of the AC input signal when turned OFF, and the second switch blocks a second half-cycle of the AC input signal when turned OFF. The driving circuit provides a driving signal to control the first switch and the second switch based on an enable signal. The power generation circuit provides a voltage signal to power the driving circuit. The power generation circuit stores energy from the AC input signal when the first switch and the second switch are turned OFF, and the power generation circuit is disconnected from the AC input signal when the first switch and the second switch are turned ON.

Description

technical field [0001] The present invention relates to an electronic circuit, specifically but not limited to an AC switch circuit and a control method thereof. Background technique [0002] In home automation applications, such as sprinkler valves, HVAC, thermostats, and surveillance cameras, mechanical relays have traditionally been used to control AC voltage inputs. figure 1 A mechanical relay in a conventional HVAC control system 100 is shown. The traditional HVAC control system 100 is coupled to the power grid through a transformer T1. The transformer T1 includes a primary winding and a secondary winding. The primary winding is coupled to the power grid and is used to receive a primary AC voltage, such as an AC voltage of 220V; The secondary winding is coupled to the load 12 and receives a secondary AC voltage, such as 24V AC voltage, through a mechanical relay. A microcontroller (MCU) 13 outputs a command signal CMD to control on and off of the mechanical relay 11 ....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/293
CPCH03K17/689H03K17/6874H03K2217/0009H03K2217/0081
Inventor 姜剑赖鹏捷周波龚军勇杨先庆
Owner CHENGDU MONOLITHIC POWER SYST