Linear constant-current driver of indicator light in power-saving high-voltage live monitoring system

Abstract

The invention discloses a linear constant-current driver of an indicator light in a power-saving high-voltage live monitoring system. The linear constant-current driver comprises a rectifier diode (D1), a polar capacitor (C1), and a light-emitting diode group (D1). A negative electrode of the rectifier diode (D1) is connected with the input terminal of the light-emitting diode group; and a positive electrode of the polar capacitor (C1) is connected to a line to which the positive electrode of the rectifier diode (D1) is connected and a negative electrode of the polar capacitor (C1) is grounded. The light-emitting diode group includes a plurality of light-emitting diodes connected in series; each light-emitting diode in the light-emitting diode group is connected in parallel with an inverted voltage-stabilizing tube; and the output terminal of the light-emitting diode group is grounded. The voltage-stabilizing tube is capable of protecting the light-emitting diodes, thereby avoiding circuit breakage and guaranteeing normal operation of the high-voltage live monitoring system.

Description

technical field [0001] The invention relates to a live detection device for high-voltage equipment, in particular to a linear constant-current driver for an indicator light in a power-saving high-voltage live monitoring system. Background technique [0002] Nowadays, high-voltage equipment is more and more widely used in the power generation, distribution, and power transmission systems of the power system. It is particularly necessary to configure a live monitoring system. The live monitoring system is a kind of prompt safety device installed directly on the high-voltage power transmission and distribution facilities, which can visually show whether the high-voltage power transmission and distribution facilities have operating voltage. The indicator light on the monitoring system flashes to warn people that the high-voltage transmission and distribution facilities are live, and there is no indication when there is no power. [0003] The indicator lights of the high-voltag...

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Problems solved by technology

[0003] The indicator lights of the high-voltage live monitoring system often use LED lights. According to the electrical characteristics of LEDs, the average forward current of LEDs increases linearly with the increase of forward voltage, and the forward voltage of LEDs after forward conduction The change of the current will cause a great change in the current on the LED, and the current has a great influence on the junction temperature of the LED. Excessive current can easily cause the LED to be damaged due to the rise of the junction temperature.

The LED is damaged due to the change of voltage, which will affect the normal application of the high-voltage live monitoring system

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