LED dimming control circuit and dimming control method
A dimming control circuit and output circuit technology, which is applied in the direction of electroluminescent light source, light source, electric light source, etc., can solve the problems of LED control system complexity and cost increase, and achieve the effect of easy operation, good effect and simple method
Active Publication Date: 2019-04-16
SUZHOU ZHIPU XINLIAN ELECTRONICS TECH
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Problems solved by technology
[0003] The above two dimming methods need to add certain matching devices to achieve the purpose of dimming, which complicates the LED control system and increases the cost
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[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0025] like figure 1 As shown, the LED dimming control circuit includes a power switch, a square wave output circuit, a counter 1, a primary current peak detection circuit 4, a drive circuit 3, a first switch tube M1 and a current detection resistor R2, and the square wave output circuit is used for According to the power switch action to generate a square wave signal, see the schematic diagram of generating a square wave signal figure 2 ; Described counter 1 is used for accumulating the number of square waves and outputs binary signal; The output end of described counter 1 is connected to the input end of primary current peak value detection circuit 4; image 3 As shown, the primary current peak detection circuit 4 includes a reference voltage selector 21 and a detection comparator 22; the reference voltage selector 21 is used to select a refe...
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The invention discloses an LED dimming control circuit and a dimming control method, comprising a power switch, a square wave output circuit, a counter, a primary current peak detection circuit, a drive circuit, a switch tube and a current detection resistor, the output terminal of the counter Connect the input terminal of the primary current peak detection circuit; the primary current peak detection circuit includes a reference voltage selector and a detection comparator; the same direction input terminal of the detection comparator is connected to the output terminal of the reference voltage selector, and the output terminal of the detection comparator Connect to the input terminal of the drive circuit, the output terminal of the drive circuit is connected to the gate of the switch tube, the source of the switch tube is connected to one end of the current detection resistor, and the other end of the current detection resistor is connected to the load; the connection between the source of the switch tube and the current detection resistor leads to the detection The signal line is connected to the inverting input terminal of the detection comparator. The LED dimming control circuit of the present invention simplifies the structure of the existing dimming control circuit and saves cost.
Description
technical field [0001] The invention relates to the field of LED control, in particular to an LED dimming control circuit and a dimming control method. Background technique [0002] With the increasing awareness of energy conservation, emission reduction and green environmental protection, the LED lighting market has expanded rapidly, replacing the original incandescent lamp market. If you want to dim the brightness of LED lighting, the most commonly used brightness control methods are the use of thyristor dimming and PWM dimming. The above two dimming methods need to add certain external devices. For thyristor dimming, a thyristor chopper device and a thyristor detection port added to the chip are required; for PWM dimming, a PWM signal generation chip needs to be added. [0003] The above two dimming methods need to add certain matching devices to achieve the purpose of dimming, thereby complicating the LED control system and increasing the cost. SUMMARY OF THE INVENTIO...
Claims
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10H05B45/37
Inventor 钱冬寅边彬杨全
Owner SUZHOU ZHIPU XINLIAN ELECTRONICS TECH