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Multiway LED constant current controller and control method

A current controller and constant current control technology, which is applied in the direction of lamp circuit layout, electrical components, electroluminescence light source, etc., can solve the load state change, the influence of constant current control accuracy and efficiency, and the loop response speed cannot adapt to the load state To improve the transient response speed and speed up the loop response speed

Inactive Publication Date: 2014-10-29
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology

However, since multiple LED lamps are used as a load of an LED constant current controller, the lighting and extinguishing of each LED lamp will cause the load state to change.
The loop response speed of the LED constant current controller in the prior art cannot meet the requirements of the load state
As a result, the constant current control accuracy and efficiency are affected by the load status, and even LED lamps are damaged due to LED current overshoot
[0006] Therefore, the LED constant current controller of the prior art is not suitable for constant current control of multiple LED lamps connected in series

Method used

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  • Multiway LED constant current controller and control method

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Embodiment Construction

[0046] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

[0047] refer to figure 2 , which shows a schematic circuit diagram of an LED constant current controller 100 using a hysteresis control method according to the prior art. The LED constant current controller 100 includes a hysteresis comparator 101 and a flip-flop 102 . The non-inverting terminal of the hysteresis comparator 101 is connected to an external current sampling unit (such as a sampling resistor) to receive a current feedback signal VFB, and the inverting terminal receives a reference voltage Vref. The output terminal of the hysteresis comparator 101 is connected to a flip-flop 102 . The output end of the flip-flop 102 is connected to an external power sw...

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Abstract

The invention discloses a multiway LED constant current controller and a control method. The multiway LED constant current controller is used for providing switch control signals to a power switch tube in a power-level circuit outside to control open-closed states of the power switch tube so as to enable the power-level circuit to generate constant current used for driving multiway LED lamp strings. The multiway LED constant current controller comprises a control loop which comprises a loop compensation network formed by multiple compensation signal maintaining elements. The multiway LED constant current controller connects the corresponding compensation signal maintaining elements in the control loop according to loaded states to enable the compensation signal maintaining elements to be respectively used for maintaining stable-state compensation signals of the control loop under different loaded states, and sets stable-state compensation signals when the loaded states change. By the multiway LED constant current controller and the control method, transient response speed when the loaded states change can be increased.

Description

technical field [0001] The present invention relates to an LED constant current controller, more specifically, to a multi-channel LED constant current controller and a control method. Background technique [0002] In lighting and backlight applications, multiple LED lights are often used in series or in parallel. Each LED lamp includes one or more LED lamps connected in series. The luminous intensity of an LED is determined by the current flowing through the LED. Therefore, an LED constant current controller is used to control the current of each LED to be constant, so as to maintain a stable luminous intensity. [0003] The LED constant current controller in the prior art is mainly suitable for driving a single LED lamp. In a multi-channel LED constant-current driving solution, each LED lamp is driven by a constant-current LED by its own constant-current controller to generate a constant driving current. In another multi-channel LED constant current drive scheme, multip...

Claims

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Application Information

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IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/24H05B45/46Y02B20/30H05B45/3725H05B45/375H05B45/48
Inventor 赖洪斌王建新
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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