Multi-chip high power LED device

Abstract

This invention relates to a multi-chip large power LED component, which is processed by making cup-shaped slots corresponding to the numbers of the chips on base boards of metals, ceramics or epoxy resin circuit, encapsulating multiple LED chips in the slots, in which, the chips are serial directly then serial to a thermistor to forma a serial circuit and the serial circuits are parallel to each other, which applies a serial way for single unit and multiple chips and a connection way in parallel, a thermistor is serial to one single unit to maintain equal voltage for the sets, when the temperature of the PN junction of the diode rises or falls, the thermistor changes toward the opposite direction along with the change of the temperature.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, and relates to a multi-chip high-power light-emitting diode device packaged on a metal substrate, a ceramic substrate or an epoxy resin circuit substrate. Background technique [0002] The light-emitting wavelength of a light-emitting diode (LED) changes by about 0.2-0.3nm / °C with the change of temperature, and the spectral width also increases accordingly. When the current passes through the pn junction, the temperature of the junction area will rise, and the luminous intensity will decrease accordingly by about 1% / 1°C. At present, the method of reducing its driving current is generally used to reduce the junction temperature, and the driving current of most LEDs is limited to about 20mA. However, the light output of LED will increase with the increase of current. At present, the driving current of many power single-chip LEDs can reach 300mA~1A, and its luminous intensity has also increa...

AI Technical Summary

Problems solved by technology

The current disadvantages of high-power light-emitting diodes are: (1) only a few companies can manufacture single-chip power devices, and the sales cost is tens to hundreds of times higher, and this product is not conducive to mass use; (2) single-chip power devices The power supply current of the power device is large, so the thermal effect is large, which seriously affects the luminous performance; (3) the technology is not very mature, which is not conducive to a large number of promotion and application; (4) the existing multi-chip light-emitting diode device has no temperature compensation, each parallel circuit Unbalanced current, easily affected by temperature changes, and even lead to chip damage

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