Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp

A technology of LED drive and over-current protection, which is applied in the direction of lamp circuit layout, current/voltage measurement, electric light source, etc. It can solve the problem of low precision of over-current protection and achieve the effect of improving precision

Active Publication Date: 2015-02-18
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide an overcurrent protection sampling circuit, aiming at solving the problem of low accuracy of current overcurrent protection

Method used

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  • Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] figure 1 The circuit structure of the LED driving circuit provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows.

[0022] A kind of LED drive circuit 100, is connected with LED lamp body 200, and LED drive circuit 100 comprises:

[0023] Switching power supply module 101, transformer T1, rectifier diode D1, filter inductor L1, energy storage capacitor C1 and filter capacitor C2;

[0024] The LED drive circuit 100 also includes an overcurren...

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Abstract

The invention provides an over-current protection sampling circuit, an LED drive circuit and an LED lamp and is applicable to the electronic lighting field. The over-current protection sampling circuit comprises a current sampling resistor and two operational amplifiers. When the LED drive circuit outputs over currents, the voltage at two ends of the current sampling resistor in a current loop which is connected in LED drive circuit in series surpasses a preset voltage; and two operational amplifiers process the voltage at two ends of the current sampling resistor and output high levels to a sampling control end of a switching power supply module, so that the LED drive circuit stops working to achieve over-current protection. The over-current protection sampling circuit greatly improves the over-current protection accuracy of the LED lamp in small current working.

Description

technical field [0001] The invention belongs to the field of electronic lighting, and in particular relates to an overcurrent protection sampling circuit, an LED driving circuit and an LED lamp. Background technique [0002] At present, as a new type of light source, LED has the characteristics of energy saving, environmental protection, high efficiency and long life, and has been widely used as a lighting source in various fields. [0003] At present, many LED-driven lamps on the market are widely used because of their high efficiency, energy saving and long life. However, the overcurrent protection sampling method is basically to connect resistors in series in the current loop, so the sampling accuracy for small current loops is not high. For example, for an LED lamp circuit with an output current of 30mA, if the sampling resistor is 1ohm, the voltage sampled by the resistor is only 30mV. Such a small signal is easily disturbed by the circuit, which will affect the accurac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02G05F1/573G01R19/165
CPCH05B45/345Y02B20/30
Inventor 周明杰管伟芳
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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