Middle Phase Power-Fetching Type Phase Front/Phase Tail Synchronized Modulation Circuit

Active Publication Date: 2016-12-15
LOONG YEE INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a middle phase power-fetching type phase front / phase tail synchronized modulation circuit to overcome shortcomings of prior art. The circuit includes a power supply unit to fetch power from the middle phase of an AC voltage waveform and supply the normal operating voltage to the modulation unit after rectification. The modulation unit includes a microcomputer, driving circuit, and two bi-directional electronic power supply elements, which can generate a phase front / phase tail turn-on modulation signal synchronously. The middle phase synchronous modulation allows the phase front and phase tail to be refracted inward or expanded outward at the same time, resulting in a stable and modulated power supply. The present invention provides a solution for generating a stable and modulated power supply to various applications.

Problems solved by technology

The drawback of this type of phase tail modulation is that, once it is triggered to turn-on, it can not be turned off until the end of the phase cycle.
In addition, the instantaneous activation current is rather large, thus it is apt to create a large peak current and large Electromagnetic Interference (EMI), and is liable to cause magnetic or light filament vibration noise, to cause light blinking.
However, when the phase of a power supply is drifting, the increase of width of phase front or phase tail will cause the light to become brighter, while the decrease of width of phase front or phase tail will cause the light to become dimmer, thus it is liable to cause blinking and noise.
However, quite a lot of the drawbacks still exist in U.S. Pat. No. 7,099,132B2.
Therefore, the imbalance of output power between the positive half cycle and the negative half cycle could cause blinking of lights.
In particular, when the voltage is not stable and can not be synchronized, the blinking of lights is especially evident.
In addition, that circuit is not capable of preventing overheating and overload.
As such, even when overheating occurs, the circuit can not be turned off, such that it will continue to heat up, until the circuit is burned out.
Therefore, presently, the design and performance of phase front / phase tail modulation circuit is not quite satisfactory, and it has much room for improvement.

Method used

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  • Middle Phase Power-Fetching Type Phase Front/Phase Tail Synchronized Modulation Circuit

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Embodiment Construction

[0026]The purpose, construction, features, functions and advantages of the present invention can be appreciated and understood more thoroughly through the following detailed description with reference to the attached drawings.

[0027]Refer to FIGS. 1 to 4 respectively for is a circuit diagram of a middle phase power-fetching type phase front / phase tail synchronized modulation circuit according to a first embodiment of the present invention; a middle phase power-fetching type phase front / phase tail synchronized modulation circuit according to a second embodiment of the present invention; a circuit diagram of a middle phase power-fetching type phase front / phase tail synchronized modulation circuit, when it is applied to a 3-wire power supply; and a circuit diagram of a middle phase power-fetching type phase front / phase tail synchronized modulation circuit, when it is applied to a 2-wire power supply.

[0028]As shown in FIGS. 1 to 4, for the first embodiment of the present invention of FIG...

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Abstract

A middle phase power-fetching type phase front / phase tail synchronized modulation circuit, comprising: a power supply unit, that is used to fetch power from the middle phase of an ordinary AC voltage waveform, and supplies it to a phase front / phase tail modulation unit as a normal operating voltage after rectification; and a phase front / phase tail modulation unit, it includes an MCU microcomputer, to control a driving circuit to turn-on, and control synchronously at least two bi-directional electronic power element, to generate a phase front / phase tail turn-on modulation signal. As such, while performing synchronous modulation from phase middle, phase front / phase tail can be retracted inward or expanded outward at the same time, so that phase front / phase tail turn-on output voltage average values complement each other, hereby achieving stable and modulated power supply.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]The present invention relates to a phase front / phase tail synchronized modulation circuit, and in particular to a middle phase power-fetching type phase front / phase tail synchronized modulation circuit, its output can be modulated synchronously from the middle phase, such that its phase front and phase tail can be refracted inward or expanded outward at the same time, so that the phase front turned-on output voltage average value and the phase tail turned-on output voltage average value complement each other, in achieving a stable and modulated power supply.[0003]The Prior Arts[0004]In general, the phase modulation circuit can be classified into a phase front modulation circuit and a phase tail modulation circuit, and it is utilized extensively in our daily life. In particular, it is used mostly frequently in modulation of illuminance of a light and rotation speed of an electric fan motor.[0005]The conventional phase tail ...

Claims

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Application Information

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IPC IPC(8): G05F3/04H02P29/00H05B37/02
CPCG05F3/04H02P29/0044H05B37/0209H05B39/08H02M1/081H02M5/293H02M5/2932H02M5/2935H02P29/0027
InventorWANG, CHI-JEN
OwnerLOONG YEE INDAL CORP