Constant-current source driver circuit and device

Abstract

The invention discloses a constant-current source driver circuit used for driving an LED illumination light source and an integrated current source device based on the circuit. A low-cost resistance-capacitance voltage-reduction type drive circuit is simple in structure and low in cost, but has the disadvantages of poor performance and low efficiency, and damages an LED light source device to a certain extent; a series voltage stabilization type circuit has the disadvantages of large volume, heavy weight, high heat generation, low efficiency and energy waste; and a PWM voltage-stabilizing or constant-current power supply has relatively good performance and higher efficiency, but has higher cost and an important problem of introducing EMI electromagnetic interference. The constant-current source drive circuit has the advantages of good constant-current effect, low cost, high efficiency, long service life and no EMI. The key point to achieve the advantages lies in adopting a CRD device to provide stable base current for a regulating tube so as to greatly improve the overall constant-current technical index on the premise of keeping simple structure and low cost of the constant-current circuit.

Description

【Technical field】 [0001] The invention relates to a power adapter, in particular to a constant current source driver circuit which can be used to drive LED lighting sources and a constant current source integrated device based on the circuit. Based on existing component resources, packaging technology and raw materials, the circuit / device achieves a high-standard constant current effect by rationally arranging the interconnection topology and parameter allocation among various components. The application of this invention can not only adopt the circuit form of discrete components, but also facilitate the use of thick film packaging, so as to achieve relatively high power utilization efficiency and device reliability at a relatively low cost. At the same time, it will not introduce EMI electromagnetic interference, so as to achieve the goal of high performance and price ratio. Based on this circuit principle, an integrated packaging process can be used to manufacture a power a...

AI Technical Summary

Problems solved by technology

[0004] In addition, if you conduct a slightly comprehensive analysis of the power adapter, you will know that the constant current source based on PWM technology has several inherent deficiencies.

First of all, its energy conversion efficiency is generally only about 80-90%, and it is difficult to achieve more than 95%; secondly, the circuit structure is relatively complex, there are many components, the control of distributed parameters requires experience, the overall manufacturing cost is high, and the volume is small. It is relatively large; again, measurement and debugging must rely on instruments and meters, and professional technology has high requirements, and debugging and troubleshooting work has certain difficulty and workload, which adds another piece of cost; finally, the circuit reliability model is more complicated, constant The reliability index of the flow source subsystem is relatively low, that is to say, its mean time between failure (MTBF) index is not high enough, which may eventually affect the overall reliability index of LED lighting fixtures.

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