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Anti-negative-voltage circuit and lamp

An anti-negative pressure and circuit technology, applied in the field of lighting, can solve the problems of the lamp beads slightly bright, affecting the customer experience, light-emitting diode damage, etc., to achieve the effect of avoiding negative pressure

Pending Publication Date: 2020-11-20
SUZHOU OPPLE LIGHTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reverse voltage is continuously applied to the light-emitting diode, exceeding the tolerance range of the light-emitting diode, which will cause damage to the light-emitting diode
At the same time, during the charging and discharging process of the parasitic capacitor, the current flows through the light-emitting diode, making the lamp bead slightly bright, which affects the customer experience

Method used

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  • Anti-negative-voltage circuit and lamp
  • Anti-negative-voltage circuit and lamp
  • Anti-negative-voltage circuit and lamp

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Embodiment Construction

[0025] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0026] figure 1 is a current flow diagram of the LED drive circuit in the prior art under the charging state of the parasitic capacitance; figure 2 It is a current flow diagram of the LED drive circuit in the state of parasitic capacitor discharge in the prior art; image 3 is another current flow diagram of the LED drive circuit in the prior art under the charging state of the parasitic capacitance; Figure 4 It is another curr...

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PUM

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Abstract

The invention provides an anti-negative-voltage circuit and a lamp. The anti-negative-voltage circuit comprises a power supply module and a lamp group composed of a plurality of light emitting diodesconnected in series according to a positive-negative electrode connection mode. The lamp group is connected between the power supply module and the ground; a parasitic capacitor is formed between eachlight emitting diode and the ground; the anti-negative-voltage circuit further comprises a plurality of anti-negative-voltage elements, the plurality of anti-negative-voltage elements are connected with the plurality of light emitting diodes in parallel one by one, and under the condition that the parasitic capacitor is charged and discharged, the voltage borne by each anti-negative-voltage element is smaller than the reverse voltage threshold value of the corresponding light emitting diode. Based on the scheme provided by the invention, under the condition that the parasitic capacitor is charged and discharged, the voltage of the light-emitting diode is clamped at the voltage borne by the corresponding negative voltage prevention element, and the voltage borne by the negative voltage prevention element is smaller than the reverse voltage threshold value of the corresponding light-emitting diode, so that negative voltage and slight light on the light-emitting diode can be avoided.

Description

technical field [0001] The invention relates to the technical field of lighting, in particular to an anti-negative voltage circuit and a lamp. Background technique [0002] The lamps are connected to L (live wire), N (neutral wire), PE (earth) three wires, and L-PE in the three wires has 220V AC voltage. When the lamp works normally, the voltages of the anode and the cathode of the LED are clamped by the power supply, the voltage on the LED is forward voltage, and the LED is in a normal state. However, in a specific state (such as when the power supply is not working at the moment of power-on, when the soft power is turned off, when the neutral line is turned off, etc.), the alternating current charges and discharges the parasitic capacitance between the light-emitting diode and the ground wire, and each parasitic capacitance is charged and discharged. Different voltages generate a voltage difference, which is added to the light-emitting diode to make the light-emitting dio...

Claims

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Application Information

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IPC IPC(8): H05B45/00
CPCH05B45/00
Inventor 朱广传梁川
Owner SUZHOU OPPLE LIGHTING