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Synchronous control circuit, control method and thyristor LED dimming circuit

A synchronous control and control circuit technology, applied in the control method, thyristor LED dimming circuit, and synchronous control circuit field, can solve the problem of large resistance loss, and achieve the effect of reducing system power consumption

Active Publication Date: 2018-06-29
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that resistance R B The loss on the

Method used

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  • Synchronous control circuit, control method and thyristor LED dimming circuit
  • Synchronous control circuit, control method and thyristor LED dimming circuit
  • Synchronous control circuit, control method and thyristor LED dimming circuit

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Embodiment Construction

[0052] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0053] refer to Figure 2A and Figure 2B , Figure 2A Shown is the application circuit diagram of the synchronous control circuit of the present invention, Figure 2B Shown is a circuit block diagram of a synchronous control circuit according to the present invention; the synchronous control circuit of the present invention is used in...

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Abstract

The invention discloses a synchronous control circuit, a control method and a thyristor LED dimming circuit. By detecting the magnitude of the inductance current when the thyristor is turned on, when the inductance current reaches the reference voltage, the power switch tube is controlled to conduct In this way, the chip is turned on and the thyristor is turned on synchronously, and the magnitude of the input current after the thyristor is turned on can meet the requirement of maintaining the operating current of the thyristor. At the same time, the present application continuously monitors the dimming state according to the first control signal, and when the dimming is not performed, the control chip enters a sleep working state. The technology of the present invention does not need to maintain the resistance, and can reduce the power consumption of the system.

Description

technical field [0001] The invention relates to the field of switching power supplies, and more specifically relates to a synchronous control circuit, a control method and a thyristor LED dimming circuit. Background technique [0002] Thyristor is often used in switching power supply circuits of LEDs. One of the working characteristics of thyristor dimming is that after the thyristor is turned on, the load current of the thyristor, that is, the input current of the switching power supply, needs to be maintained at a certain current. Above the value, when the current value of the input current is less than the current value of the holding current, the thyristor will be turned off. If the thyristor is turned on, the control chip of the switching power supply is not turned on in time to ensure that the input current is not less than the holding current, and the thyristor will be turned off. Therefore, for the thyristor LED dimming circuit, it is necessary to synchronize the PW...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/14
Inventor 刘国家徐孝如
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD