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Linear constant-current controller, chip and driving device

A linear constant current and controller technology, applied in lighting devices, energy-saving control technology, lamp circuit layout, etc., can solve problems such as inability to realize switching and dimming functions, and achieve low-cost effects

Active Publication Date: 2011-09-21
许瑞清
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a solution to realize the linear constant current switch dimming function at low cost, so as to effectively save energy.

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  • Linear constant-current controller, chip and driving device

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Embodiment Construction

[0023] The key to realizing the linear constant current switch dimming function is that after the power supply to the LED load is stopped, in the power-off state within 3 seconds, for example, the controller must be able to recognize the power-off action, and be able to adjust and 'remember' the load's Brightness status. When the power-off state lasts no more than 3 seconds and the power is turned on again, the controller should make the LED load light up with the new brightness state. And in the case that the power-off state lasts for more than 3 seconds, the controller should be able to reset.

[0024] Therefore, the first need is to provide a temporary power supply for powering the controller in a power-down state to achieve the 'memory' function. This invention cleverly uses capacitors to act as temporary power sources. After solving the problem of temporary power supply, we are faced with how to implement a series of logical operations, for example, how to judge whether...

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Abstract

The invention discloses a linear constant-current controller, a chip containing the controller and a driving device, wherein a capacitor is connected between the power end of the controller and reference ground for supplying power for the controller under the state of power failure. The controller comprises a high-voltage MOS (metal oxide semiconductor) tube, an error amplifier and a dimming circuit, wherein the drain electrode of the high-voltage MOS tube is connected to an input voltage source by constant-current source load, and the source electrode is connected to the reference ground by a detection resistor; one input end of the error amplifier receives the detection signal of current flowing through the constant-current source load, the other input end receives a dimming signal, and the output end of the error amplifier is connected with the grid electrode of the high-voltage MOS tube; and the dimming circuit is used for generating the dimming signal when being electrified according to the current detection signal. The linear constant-current controller is characterized in that the resolution mechanism of the dimming function of a linear constant-current switch is realized according to the current detection signal, and energy can be effectively saved.

Description

technical field [0001] The invention relates to a linear constant current controller circuit, in particular to a high-voltage linear constant current controller for driving constant current source loads, as well as a chip and a drive device including the controller. Background technique [0002] Due to the characteristics of high luminous efficiency, long life, no radiation and low power consumption, light-emitting diodes (LEDs) are widely used in the lighting industry. As one of the constant current source loads, the LED requires a different controller than the constant voltage source load. At present, there are two main types of controllers for driving LEDs in the industry. One is the switch constant current controller, the main feature is that it needs inductors and transformers, and the efficiency is generally higher under various conditions, but the cost is also high. The other is a linear constant current controller, which does not require inductors and transformers....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 许瑞清李嶷金洪涛刘立国
Owner 许瑞清
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