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Thyristor LED (Light Emitting Diode) light adjusting circuit and mixed reference control method thereof

A dimming circuit and control method technology, applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve the problems of reducing the efficiency of LED lighting system, increasing the difficulty of heat dissipation of LED drive circuit, increasing cost, etc., achieving high power factor and ensuring Stable triggering and improved conversion efficiency

Inactive Publication Date: 2015-02-18
SUNSUN LIGHTING CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But doing so will not only bring extra power consumption and reduce the efficiency of the LED lighting system, but also increase the heat dissipation difficulty of the LED drive circuit and increase the cost

Method used

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  • Thyristor LED (Light Emitting Diode) light adjusting circuit and mixed reference control method thereof
  • Thyristor LED (Light Emitting Diode) light adjusting circuit and mixed reference control method thereof
  • Thyristor LED (Light Emitting Diode) light adjusting circuit and mixed reference control method thereof

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Experimental program
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Effect test

specific Embodiment 1

[0038] Specific embodiment 1: Using 2 voltage reference values ​​to obtain 3 sets of current reference combinations, setting the inductor current reference from the three perspectives of improving power factor, maintaining stable triggering of thyristor, and driving circuit efficiency requirements, specifically includes the following steps:

[0039] Step 1. Collect the instantaneous value Vsense of the input voltage of the drive circuit in the thyristor LED dimming circuit and the instantaneous current value Isense that flows through the switch after the switch is turned on.

[0040] Step 2: Compare the instantaneous value Vsense of the input voltage of the drive circuit with the first reference value of the input voltage:

[0041] When the instantaneous value Vsense of the input voltage of the drive circuit is lower than the first reference value of the input voltage, a straight line whose amplitude is beneficial to maintain the steady triggering of the thyristor is used as the induc...

specific Embodiment 2

[0053] Specific embodiment 2: Using 1 voltage reference value to obtain 2 sets of current reference combinations, setting the inductor current reference from the two perspectives of increasing the power factor and maintaining the stable triggering of the thyristor, specifically includes the following steps:

[0054] Step 1. Collect the instantaneous value Vsense of the input voltage of the drive circuit in the thyristor LED dimming circuit and the instantaneous current value Isense that flows through the switch after the switch is turned on.

[0055] Step 2: Compare the instantaneous value Vsense of the input voltage of the drive circuit with the first reference value of the input voltage:

[0056] When the instantaneous value Vsense of the input voltage of the drive circuit is lower than the first reference value of the input voltage, a straight line whose amplitude is beneficial to maintain the steady triggering of the thyristor is used as the inductor current reference;

[0057] Whe...

specific Embodiment 3

[0065] Specific embodiment 3: Using 1 voltage reference value to obtain 2 sets of current reference combinations, setting the inductor current reference from the two perspectives of improving the efficiency of the drive circuit and maintaining the stable triggering of the thyristor, specifically includes the following steps:

[0066] Step 1. Collect the instantaneous value Vsense of the input voltage of the drive circuit in the thyristor LED dimming circuit and the instantaneous current value Isense that flows through the switch after the switch is turned on.

[0067] Step 2: Compare the instantaneous value Vsense of the input voltage of the drive circuit with the first reference value of the input voltage:

[0068] When the instantaneous value Vsense of the input voltage of the drive circuit is lower than the first reference value of the input voltage, a straight line whose amplitude is beneficial to maintain the steady triggering of the thyristor is used as the inductor current ref...

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Abstract

The invention discloses a thyristor LED (Light Emitting Diode) light adjusting circuit and a mixed reference control method thereof, which belong to the technical field of semiconductor lighting. The light adjusting circuit comprises a thyristor light modulator and a drive circuit, wherein the drive circuit comprises a rectifier bridge, an inductor, a switching tube, a rectifier filter output circuit, a mixed reference controller, a voltage sampling circuit and a current sampling circuit. The mixed reference control method comprises the following steps that an instantaneous value of input voltage of the drive circuit is compared with a reference value of reference voltage set in the mixed reference controller, and current reference is obtained; and then an instantaneous value of current which passes through the switching tube is compared with the current reference, and a signal used for controlling the switching tube to connect and disconnect is obtained. A flexible current reference combined mode is adopted to guarantee that relatively larger working current can pass through a light adjusting thyristor even if the instantaneous amplitude of the input voltage is lower. By using the method, the LED flicker phenomenon due to thyristor light adjustment can be effectively reduced, a high power factor can be kept, and the conversion efficiency of the drive circuit is increased.

Description

Technical field [0001] The invention discloses a thyristor LED dimming circuit and a mixed reference control method thereof, belonging to the technical field of semiconductor lighting. Background technique [0002] LED lighting dimming system framework such as figure 1 As shown, it includes a power supply, a thyristor dimmer and an LED drive circuit. One end of the thyristor dimmer is connected to the power source, and the other end is connected to the LED drive circuit. The LED lights are connected in parallel to the output voltage side of the LED drive circuit, and the LED lights may have a single or multiple series or parallel forms; AC power is a common household power supply, and the effective value of the voltage in the United States is 110V / 60Hz. In China, the effective value of the voltage is 220V / 50Hz alternating current; dimmers are various products based on thyristor dimming technology. The thyristor dimmer can phase modulate the input sinusoidal voltage waveform into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 向东周岩
Owner SUNSUN LIGHTING CHINA
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