Linear constant-current circuit
A linear constant current circuit and circuit technology, applied in the field of circuits, can solve the problem of easy burnout of the switch tube, and achieve the effect of solving the problem of easy burnout and ensuring power
Active Publication Date: 2019-06-14
GUANGDONG VTRON TECH CO LTD
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Problems solved by technology
[0004] In view of this, the application provides a linear constant current circuit, which solves the technical problem that the switch tube of the existing LED constant current drive circuit is easily burned out
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[0049] The above is the first embodiment of the linear constant current circuit provided by the embodiment of the present application, and the following is the second embodiment of the linear constant current circuit provided by the embodiment of the present application.
[0050] see figure 1, the linear constant current circuit in this embodiment includes: a superposition circuit A, a voltage divider circuit B, a feedback circuit, and a constant current drive circuit C; the constant current drive circuit C includes a connected constant current drive amplifier and a switch tube, and the switch tube It is connected to the LED load; superimposition circuit A is used to superimpose the input signal and reference voltage to output the superimposed voltage; voltage divider circuit B is used to divide the superimposed voltage and output the divided voltage; the constant current drive amplifier is based on the divided voltage and the feedback circuit The collected voltage drop of the...
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The invention discloses a linear constant-current circuit. The linear constant-current circuit comprises a superposition circuit, a voltage dividing circuit, a feedback circuit and a constant-currentdriving circuit, wherein the constant-current driving circuit comprises a constant-current driving amplifier and a switching tube which are connected, and the switching tube is connected with an LED load; the superposition circuit is used for superposing an input signal and reference voltage to output superposition voltage; the voltage dividing circuit is used for dividing the superposition voltage and then outputting division voltage; and the constant-current driving amplifier regulates the reference voltage input into the constant-current driving amplifier and the switching tube according tothe division voltage and a voltage drop, collected by the feedback circuit, of the switching tube so as to regulate the power of the switching tube. Through the linear constant-current circuit, the technical problem that a switching tube of an existing LED constant-current driving circuit is prone to being burnt is solved.
Description
technical field [0001] The application belongs to the field of circuit technology, and in particular relates to a linear constant current circuit. Background technique [0002] LED is a cold light source with high working voltage and high luminous efficiency. It has been widely used in lighting. However, there is an important key problem in the popularization and application of LED lighting equipment at present, that is, the instability of the control circuit will greatly reduce the life of LED. According to According to statistics, about 70% of the failures of LED white light lighting fixtures are power supply problems, about 20% are circuit and structural problems, and about 10% are LED quality problems. Therefore, power management plays a decisive role in the quality and stability of LEDs. [0003] According to the electrical characteristics of the LED, in order to keep the current of the LED stable in the prior art, a linear constant current circuit composed of a constan...
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IPC IPC(8): H05B33/08H05B44/00
Inventor 梁红涛
Owner GUANGDONG VTRON TECH CO LTD