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Status switching circuit of LED controller

A LED controller and state conversion technology, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of unfavorable circuit wiring, battery power consumption, increase the difficulty and cost of LED controller manufacturing, and achieve convenient circuit wiring , The effect of reducing the circuit cost

Inactive Publication Date: 2010-05-26
QX MICRO DEVICES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] figure 1 The disadvantage of the circuit shown is that the battery always consumes power after power-on, and this LED controller needs at least four pins: VDD, VSS, ON / OFF, LED (LED only needs one pin: you can connect the anode to the battery or Connect the cathode to ground), where the ON / OFF pin is required for the state transition circuit
[0006] figure 2 The LED controller shown also requires at least four pins: VDD, VSS, VC, and LED. The VC pin is used for the state conversion circuit, which is not conducive to circuit wiring, and also increases the manufacturing difficulty and cost of the LED controller.

Method used

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  • Status switching circuit of LED controller
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  • Status switching circuit of LED controller

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Embodiment Construction

[0025] LED flashlight of the present invention, as image 3 As shown, it consists of batteries, capacitors, switches, LED controllers and LED lights. Among them: the LED controller only needs three pins: VDD, VSS, LED (the LED light only needs to occupy one pin: the anode can be connected to the battery or the cathode can be grounded); the state conversion circuit is composed of a voltage detection unit and a state machine. Specific as Figure 4 As shown, its specific working principle is: the voltage detection unit compares the power supply voltage VDD with VTH1, outputs a digital level signal Y as the pulse trigger signal CP of the state machine, and Y also serves as the enable signal EN of the controller. The key point of this state transition circuit is to generate the pulse trigger signal CP necessary for the state machine to switch states. The principle of generating the pulse signal is as follows: when the switch is turned on, the voltage of the power supply VDD of th...

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Abstract

The invention relates to a status switching circuit of an LED controller. The status switching circuit of the LED controller comprises a DC power supply and a switch thereof which are correspondingly connected with an LED controller power supply input terminal and a power supply ground input terminal, and also comprises a capacitor which is bridged on the power supply and the power supply ground input terminal. The LED controller detects the voltage of the power supply input terminal to switch status so as to integrate the LED controller detection input terminal with the power supply input terminal; and a pin of the LED controller is reduced so that the cost of the circuit is reduced and the circuit layout is convenient.

Description

technical field [0001] The invention relates to environmental protection and energy-saving electronic products, in particular to a state conversion circuit of an LED controller in LED lighting. Background technique [0002] The high-end LED flashlight adopts a dedicated controller to realize various functions such as full brightness, half brightness, fast flash, SOS, etc. Therefore, the state conversion circuit is a key unit in the multi-functional LED flashlight controller, and its function is to realize among multiple functions. switch between states. The state conversion circuit is generally composed of external switches and internal pulse signal generators, state machines, and power-on reset circuits. [0003] A commonly used LED flashlight controller solution, such as figure 1 As shown, the LED controller is always electrically connected to the battery after power-on. The switch is connected to a dedicated pin ON / OFF of the LED controller. When the switch switches b...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 黄朝刚廖少雄李永红毛晓峰
Owner QX MICRO DEVICES
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