A LED drive circuit using cold bipolar transistors

Abstract

The invention discloses an LED driving circuit using a cold bipolar triode, comprising a rectification filter circuit, a cold bipolar triode and a feedback adjustment circuit, the control end of the cold bipolar triode is electrically connected with the rectification filter circuit to pass The filter circuit triggers the conduction of the cold bipolar transistor, the input terminal of the feedback regulation circuit is electrically connected with the output terminal of the cold bipolar transistor, and the output terminal of the feedback regulation circuit is electrically connected with the control terminal of the cold bipolar transistor. According to the output signal of the cold bipolar transistor, the on-off of the cold bipolar transistor is controlled by feedback, so that the output terminal of the cold bipolar transistor outputs a high-frequency voltage signal to drive the LED to work. This design can drive high-power LEDs, because The cold bipolar triode has high temperature resistance, which greatly saves the cost. At the same time, the cold bipolar triode works stably, is not easy to be damaged, and has high durability.

Description

technical field [0001] The invention relates to an LED driving circuit, in particular to an LED driving circuit using a cold bipolar triode. Background technique [0002] The existing LED drive circuit uses a constant current drive circuit driven by an IC, or a drive circuit composed of a field effect transistor and an ordinary bipolar transistor plus other components. The cost of an IC constant current drive circuit is relatively expensive, and the field effect The structure of the drive circuit composed of tube and ordinary bipolar transistor plus other components is relatively simple, and the cost is also low, but the high temperature resistance is not good, especially when driving high-power LED, use IC drive or use field effect tube and ordinary dual The driving circuit composed of polar transistors and other components requires more cost for heat dissipation and ensuring normal operation, so that consumers have to bear more costs when using it. [0003] Nowadays, cold...

AI Technical Summary

Problems solved by technology

[0002] The existing LED drive circuit uses a constant current drive circuit driven by an IC, or a drive circuit composed of a field effect transistor and an ordinary bipolar transistor plus other components. The cost of an IC constant current drive circuit is relatively expensive, and the field effect The structure of the drive circuit composed of tube and ordinary bipolar transistor plus other components is relatively simple, and the cost is also low, but the high temperature resistance is not good, especially when driving high-power LED, use IC drive or use field effect tube and ordinary bipolar The driving circuit composed of polar triode and other components needs to invest more cost because of heat dissipation and ensuring normal operation, so that consumers have to bear more costs when using it.

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