A circuit for preventing explosion

A circuit and capacitor technology, which is applied in the field of LED lamp testing, can solve problems beyond PFC-MOSFET, PFC bomber, and affect key parameters of the test, so as to avoid the bomber phenomenon, the implementation method is simple and effective, and the cost is low.

Active Publication Date: 2017-07-14
乐雷光电(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase of parasitic capacitance, when the high-voltage insulation test is performed on it, the noise will be coupled to the line through the parasitic capacitance, which will affect the key parameters of the test, resulting in the voltage stress beyond the PFC-MOSFET can withstand, and the PFC part will explode. machine

Method used

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  • A circuit for preventing explosion

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Embodiment Construction

[0012] Such as figure 1 Shown is an anti-explosion circuit, which has a simple circuit structure and low manufacturing cost. The specific technical scheme is as follows: the circuit includes a bridge rectifier circuit DB1, and the negative output terminal of DB1 is grounded; the positive output terminal of DB1 is connected to the transformer T1 One end of the transformer T1 is commonly connected with the forward input end of the diode D1, and the other end of the transformer T1 is commonly connected with the forward input end of the diode D2, the drain of the FET transistor Q1, and one end of the capacitor C2; the other end of the capacitor C2, the field The source of the effect tube transistor Q1 is grounded; the reverse input terminal of the diode D1, the reverse input terminal of the diode D2, one end of the capacitor C3, and one end of the capacitor C4 are connected in common; the other end of the capacitor C3 and the other end of the capacitor C4 are grounded to GND ; The...

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Abstract

The invention discloses an anti-explosion circuit and belongs to the technical field of LED lamp testing. When a sealant-filled switching power supply with a lamp is subjected to high-voltage-resistance test, the sum of applied input voltage and output voltage equals to input-to-ground voltage, so that a field-effect transistor Q1 requires high voltage resistance. In order to protect the field-effect transistor Q1 and decrease Vgate voltage of the field-effect transistor Q1, a capacitor C1 is parallelly connected with a gate pole of the field-effect transistor Q1 to increase capacitance of an input capacitor Ciss. The anti-explosion circuit has the advantages that when a high-voltage insulation test is performed, impulse voltage of the field-effect transistor Q1-MOSFET (metal-oxide -semiconductor field effect transistor) door pole can be decreased effectively, the field-effect transistor Q1 can be protected, and explosion is avoided.

Description

technical field [0001] The invention relates to the technical field of LED lamp testing, in particular to a circuit for preventing a switching power supply from blowing up when the lamp is put on the lamp for high-voltage testing after glue filling. Background technique [0002] At present, most of the LED street light power supplies on the market are equipped with PFC, and they all need to be potted (epoxy resin or polyurethane potting glue) for IP66 waterproofing. The street lamp is a capacitive load, which introduces parasitic capacitance, which also increases the parasitic capacitance after glue filling. Due to the increase of parasitic capacitance, when the high-voltage insulation test is performed on it, the noise will be coupled to the line through the parasitic capacitance, which will affect the key parameters of the test, resulting in the voltage stress beyond the PFC-MOSFET can withstand, and the PFC part will explode. machine. Therefore, when the switching power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R1/36
Inventor 陈显林彭解红王安素王仲蔡海强陈松高红宝
Owner 乐雷光电(中国)有限公司
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