Demagnetization detection method, demagnetization detection circuit and constant current driver using the circuit
A technology of constant current driver and detection circuit, applied in magnetic performance measurement, electric lamp circuit arrangement, electric light source, etc., can solve the problems of inflexible application, high design cost, large volume, etc., to improve flexibility, reduce design cost and volume effect
Active Publication Date: 2017-07-07
MAXIC TECHNOLOGY CORPORATION
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Problems solved by technology
Although this detection scheme is simple, with the change of the energy storage inductance, the auxiliary winding also needs to be changed accordingly, resulting in high design cost, large volume, and inflexible application
For LED driving switching power supply, the requirements of low cost, small size and flexible application are no longer applicable.
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present invention.
[0032] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or impo...
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The invention provides a demagnetization detection method, a demagnetization detection circuit and a constant current driver applying the demagnetization detection circuit. The demagnetization detection circuit comprises a switching tube (M2), a bias unit (10) and a comparison unit (COMP1), wherein the drain electrode end of the switching tube (M2) is connected with energy storage elements under detection (L and T); the bias unit (10) is connected with the grid electrode end of the switching tube (M2) to sample a signal of the grid electrode end of the switching tube (M2) and sends the sampled signal to the comparison unit (COMP1); different input ends of the comparison unit (COMP1) receive the signal from the bias unit (10) and voltage reference (VREF_DM) and compare the signal from the bias unit (10) with the voltage reference (VREF_DM). By means of the demagnetization detection circuit, detection on demagnetization completion of the energy storage elements is performed directly through the switching tube, therefore, design cost and size of the circuit can be reduced, and application flexibility can be improved.
Description
technical field [0001] The invention relates to a demagnetization detection method and circuit, in particular to a demagnetization time detection method and detection circuit of an inductive energy storage element, and a constant current driver using the circuit. Background technique [0002] Light-emitting diodes (light-emitting diodes, LEDs) are increasingly used as lighting sources due to their high luminous efficiency and long life. Commercial or household lighting equipment is often driven by commercial power (high-voltage power-frequency alternating current), which requires AC-DC conversion to provide constant current for LEDs. [0003] The AC-DC LED drive circuit (driver) is actually a constant current power supply circuit for LEDs. This circuit converts the mains power into a specific output current to drive the LED to emit light, and uses devices to modulate the output current so that the average output current remains constant. Constant, and the output current doe...
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IPC IPC(8): G01R33/12H05B37/02
Inventor 刘柳胜牟在鑫郭越勇
Owner MAXIC TECHNOLOGY CORPORATION