Mains voltage leakage detection control circuit and method

A leakage detection and control circuit technology, applied in the field of lighting, can solve problems such as inconvenient replacement or replacement of lamps, damp circuit boards, electric shock hazards, etc., and achieve the effects of simple and reliable peripherals, strong reliability, and system cost savings

CN108901096BActive Publication Date: 2020-08-04QX MICRO DEVICES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-08-04

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Abstract

The invention discloses a mains voltage leakage detection control circuit and method. The circuit includes a detection protection chip, and the VAC pin in the chip is connected to the VSS pin through the chip resistance R1 and the chip resistance R2; the VAC pin is detected through the online ICT Connect to VSS; between the chip resistor R1 and the chip resistor R2 connect the negative pole of the comparator CPA, the positive pole of the comparator CPA is connected to REF, the output terminal of the comparator is connected to the logic control circuit; the GND pin is connected to the source of the control switch MOS transistor Q1 , the SW pin is connected to the drain of the control switch MOS transistor Q1, and the gate of the control switch MOS transistor Q1 is connected to the logic control circuit. Compared with the prior art, in the present invention, the mains voltage leakage detection control circuit, its detection and protection chip controls the turn-off of the control switch MOS transistor Q1, controls the voltage within the range that the human body can bear, and protects the human body from electric shock .
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Description

technical field

[0001] The invention belongs to the field of lighting, and in particular relates to a mains voltage leakage detection control circuit and method. Background technique

[0002] Leakage is caused by a certain potential difference between the electrical casing and the live wire of the mains for some reason and the ground. There are two reasons for the leakage: 1. The circuit board used by some electrical appliances has its own problems (the low-voltage circuit of the circuit board is not isolated from the 220V AC, and it itself has mains power), and most of the electrical appliances using switching power supply belong to this situation. . For example, some old-fashioned color TVs will feel numb when people touch the antenna. This is the leakage caused by the connection between the antenna and the circuit board. However, these electricity are not very dangerous to people, because there is a resistor with a large resistance between the circuit board and the main...

Examples

Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] see figure 1 As shown, in the prior art, this circuit is based on the principle of an ordinary LED lamp module. This module receives an AC voltage input from the live line L and neutral line N of the mains, passes through a rectifier bridge and passes through a filter capacitor to obtain a DC voltage, and then for The drive module and the load supply power to make the drive module work normally and make the load LED achieve the expected setting effect.

[0024] see figure 2 As shown, in the process of replacing the fluorescent lamp with an ordinary LED lamp module, one end of the lamp nee...