Dimming method, adjuster and dimming system

Abstract

The embodiment of the invention discloses a dimming method, an adjuster and a dimming system. The dimming method comprises the following steps: detecting the conducting situation of a main switch of a dimming switch; controlling a first current source and a second current source according to the conducting situation of the main switch, wherein when the main switch is conducted, judging whether the load voltage is less than a preset voltage value or not; if the load voltage is less than the preset voltage value, switching on the first current source; if the load voltage is not less than the preset voltage value, switching off the first current source and the second current source; when the main switch is switched off, switching on the first current source or the second current source, wherein the first current source and the second current source are in parallel connection, the first current source outputs a constant current, and the second current source outputs a variable current. The dimming method, the adjuster and the dimming system can increase the dimming range, reduce power consumption, and can guarantee flicker-free or shimmering loading under the circumstance of switching off the dimming switch.

Description

technical field [0001] The invention relates to the field of dimming switches, in particular to a dimming method, an adjuster and a dimming system. Background technique [0002] At present, most of the dimmer switches on the market are designed for the two-wire system, that is, there are only live wires and load wires in the cavity of the dimmer switch, and there is no neutral wire. In order to reduce the loss of the dimming switch, the chopping type dimming switch is designed as a zero-crossing switch. For example, in the leading-edge phase-cutting mode, the dimming switch will be disconnected at the current zero-crossing point; in the trailing-edge phase-cutting mode Down, the dimmer switch will be closed at the voltage zero crossing. In order to ensure that the dimmer switch can work normally, it is necessary to ensure a stable zero-crossing point in each dimming half cycle. Since the control circuit of the dimmer switch requires a certain amount of power consumption, w...

AI Technical Summary

Problems solved by technology

However, for CFL and LED type loads, due to the low power of the load lamp and the internal rectifier bridge circuit, this type of load will appear in a high impedance state, and the charge stored in the safety capacitor cannot be in each sine wave. Rapid discharge in half a cycle leads to insignificant changes in the voltage across the load lamp, so the brightness change in the dimming process is also insignificant

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